Yvette D Kuiper: So I think I might just start actually it's eight o'clock I know people are tuning in from wherever you're.
Yvette D Kuiper: So welcome everybody to our session this morning, as you all know, our session is connected to an IDC projects that we have started.
Yvette D Kuiper: In 2019 we were planning out it's on the pre Atlanta connections between north west Africa North and East, North America and.
Yvette D Kuiper: The plan was to go to Morocco, this year, which is not happening to the Gulf it's are we trying to relay to kill tips by one year, so we'll have to next year, the year after me or after.
Yvette D Kuiper: We will love follow up on that soon meanwhile we started off with some really nice online meetings and mobile keep having your shoe and.
Yvette D Kuiper: So All I will say about that So if you want to join the project i'll put the link in the in the chat and you can join anytime we get at least on the email list.
Yvette D Kuiper: And you can read all about that, for now, I just want to spend a few minutes, because I know not everybody is comfortable assume to talk about the system.
Yvette D Kuiper: So you're made of here so congratulations, so there for the speakers.
Yvette D Kuiper: What will be really helpful, I think, is to have your own timer on the side, so you can watch yourself like a phone or something I wear a good old fashioned the alarm clock so you can keep track of your shelf that's easier, I will interrupt you at like five minutes ahead of time.
Yvette D Kuiper: Two minutes or five minutes ahead of time three minutes ahead of time and one minutes ahead of time like before the 20 minutes, and then you really have to rapper but.
Yvette D Kuiper: The ADHD will keep you talk to 50 minutes or five minutes to questions.
Yvette D Kuiper: After that, it will be posters, and I will also announce right now, by the way, that there are two talks and in the afternoon in the general pathology instruct your sessions that.
Yvette D Kuiper: That excellently ended up in that session that they're really part of this session later on Morocco, so you can know joined joined us, so I don't forget them telling us what we will remind.
Yvette D Kuiper: us later.
Yvette D Kuiper: So speakers when it's your turn to talk at the bottom of your screen you'll see a green button that says share screen from there, you can go share your screen to talk they click on the play button on the PowerPoint as you normally do, and you can use your mouse pointer and.
Yvette D Kuiper: If it doesn't work we'll talk you through it, but that's essentially as simple as it goes.
Yvette D Kuiper: People asking questions you can type them in the chat also at the bottom of your screen there's a chatting you can type of question, there we will try to read them off as message we have time for.
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Yvette D Kuiper: Their reactions, you can give any reactions there's also the.
Yvette D Kuiper: The raise hand feature the raise hand feature, you can stick up your hands, if you have a question also try to keep track it's probably more efficient to just.
Yvette D Kuiper: Type your question in the chat or to.
Yvette D Kuiper: unmute yourself and ask your question if there's time.
Yvette D Kuiper: So those are the ways to ask questions during the talk so I asked everybody to keep your cameras and sound off the microphones off as much as possible.
Yvette D Kuiper: So that we don't interrupt each other, and also to sort of the bandwidth is a little better for those fish the fish get the Internet so.
Yvette D Kuiper: else.
Yvette D Kuiper: I think that's all you need to know I think that's all I need to so you can also in the chat you can.
Yvette D Kuiper: If you want to talk to someone in specific editor ask a question to us, or to just chat with someone you can actually in the toolbox in the chat you can click on the name and chat to someone in person, so so you don't necessarily have to talk to the whole group.
Yvette D Kuiper: I think those are the only things you have to talk about, are there any questions from the speakers.
Yvette D Kuiper: Before we start off.
Douglas Reusch: By the we courted version, how do I play.
Yvette D Kuiper: The recorded version I will play it for you okay.
Yvette D Kuiper: yeah.
Yvette D Kuiper: I have it on my computer and that should work.
Yvette D Kuiper: So in that case i'll ask john to start sharing your screen.
Yvette D Kuiper: And while he's doing that, alone, introduce him this is done rather than.
Yvette D Kuiper: And now he's going to be talking about building kinematic models for the iPad this ocean closure so asking how to mute or you can turn your cameras and or at least your microphones off.
Yvette D Kuiper: So we don't disturb.
John Waldron: And you can hear me okay.
John Waldron: Can you hear me okay.
Sandra Barr: Yes.
John Waldron: Yes, thank you okay.
John Waldron: Great alright.
John Waldron: So thank you everybody and i'm, as you said, going to be talking about building kinematic models for our ipads ocean closure, which is something that people have been trying to do for 50 years since the earliest days of plate tectonics maybe more.
John Waldron: So it's quite a task because more information becomes available, of course, every year to keep things even half manageable i'm going to confine myself to the northern appalachians and the colored knights of the British Isles, the area shown in the lodge.
John Waldron: over here, it even in this more limited area there's a bewildering number of terrains concert train super terrains domains that have been named to keep track of them with put little labels here on a whole bunch of them, you can see that there are a lot.
John Waldron: There is also a bewildering number of lines that have been defined within the northern appalachians and British clad nights some of them are shown here, and many of these have been hailed at one time or another, as the APP it's a suture.
John Waldron: I will.
Confex Tech Support, Christine: attempt to show that that's.
John Waldron: Probably a pointless exercise, because the iPad is ocean was too complicated to have a single suture.
John Waldron: But we'll talk about some of those lines later on.
John Waldron: So many people I have attempted to build models for the closure of the iPad association.
John Waldron: And for the most part, people have started from the part of the origin that they know best everybody does this.
John Waldron: And it has some advantages, because you know what you're talking about, but it has some disadvantages because you may be attempted to assume that things.
John Waldron: correlate along strike in geometry, that is to say that the origin is cylindrical and you may be tempted to assume that things correlate along strike in time, that is to say that the origin developed synchronously.
John Waldron: So both the benefits and the pitfalls, I would say, are illustrated by these two papers by Francis McDonald, the one on the left and 2014 showed very convincingly that a piece of candy area.
John Waldron: paragon one and Oregon one a derived terrain arrived in southern New England early in the or division by about 475 and that was followed by a slip of the polarity of seduction.
John Waldron: So that the lunch margin became active and subduction continued under that our engine launching.
John Waldron: The diagram on the right from the 2017 Paper shows how McDonald that our attempt to correlate that.
John Waldron: Those stages and geometries along strike all the way to Newfoundland and I would say that that's more problematic because I think we can.
John Waldron: Find substantial differences, both in geometry and in timing between New England and Newfoundland so correlating this timing of slab reversal all that far along the origin, I would say is is perhaps less wise.
John Waldron: To illustrate why that is so, I want to show the best modern analogy, using the present as a key to the past.
John Waldron: That we have for the ordovician laurentian margin and that's the present day northern margin of Australia, which is a carbonate margin so it's already quite a good analog.
John Waldron: And the northern margin of Australia has commentaries and resources on it, similar to the rancher in your division.
John Waldron: And it has already undergone Arc constellation continent collision in this region, Papua New Guinea here and subduction polarity reversal has taken place in the recess down here.
John Waldron: There is still a colliding Arc which is just coming on to the margin, and if you go further along the margin down here.
John Waldron: The Ark has not even touch the margin, yet this is still a passive margin so there's a an area of seduction polarity flip here that is moving diack earnestly in a sort of stop start way along the Australian margin over time.
John Waldron: So we can make that analogy better by flipping Australia and spinning it around so it looks like Eastern or enter in a new ordovician and you can see the analogy of shape.
John Waldron: So this slide attempts to go forward 10 million years, maybe 20 million years and look at the Australian margin, as it will be in the future and one would predict, I think that that polarity reversal will migrate, all the way along the margin.
John Waldron: And then, this massive terrains over here which i've provocatively label and area will be progressively accreting some of these terrains carry the record of collisions which have already occurred say in the Philippines here.
John Waldron: And so that would be an analog for the penobscot events that we see within gandy area and those some of those events are contemporary with the to conan events we see on the margin, but they.
John Waldron: are only brought together later by the accretion of these candy or interns which carry that earlier record.
John Waldron: So there's one published model on a sphere, for the development of the appalachians, and that is matt two miles from 2016 and.
John Waldron: matt published the G plates parameters, these are rotation Poles, which you can use yourself, you can pull into the publicly available cheap plates software and you can actually animate.
John Waldron: Those steps on the screen, if you want i've added present a topography here, which is a little unrealistic but makes the continents easily identifiable.
John Waldron: In demise model, the gondwana derived trains in the iPad as ocean sit on a single plate.
John Waldron: For much of their history, until the very last stages in their arrival at the wrench margin, and I would say that that, in the light of what we saw in Australia, that is definitely too simple we're expecting the creation process to be quite complicated.
John Waldron: So, in attempting a better reconstruction, I would like to I think we should use some data sets that are not being fully utilized, and these are.
John Waldron: legacy bios graphic graphic data detritus provenance of course which everybody uses these days and the declaration part of Paleo magnetism i'll show you what I mean by each of these.
John Waldron: So lots of buyers strategically very meticulous by stratigraphy was done in the 19th and 20th centuries in the origin.
John Waldron: At the time we really didn't know the numerical ages of the fossil zones, because and as a result, it was very hard to correlate the.
John Waldron: bias strata graphic data with the joker and logic data from igneous rocks that's much better now because the time scale is very well call it.
John Waldron: A calibrated in the ordovician and Syrian and many of these fossils ones can be pinned down within a couple of million years, making them almost as good as the better children logic data.
John Waldron: So we've attempted to go through the stratigraphy the fossils are these little tiny blue bracket blue brackets here.
John Waldron: This is the part of the agenda, perhaps I know best in western Newfoundland and we can relate the event on the margin to the events recorded by volcanic rocks in the middle part of the Oregon.
John Waldron: Last summer, we couldn't go in the field, but I had two students employed for the summer, so we undertook a compilation of all of the details on data that were available for.
John Waldron: This part of the origin, there are over 350 published data sets and to try to make them comparable we extract the numbers from an annoying variety of pdfs and tabular format.
John Waldron: We use the standardized method of selection of the isotopic system we standardize the discrepancy cut off, but we left the other data reduction steps as the analysts had done them because we assume each person understands their own mass spectrometer best.
John Waldron: But we did locate the latitudes and longitudes of all the samples, and we estimated the deposition will age using our by strategy graphic compilation.
John Waldron: So we have those data compiled and I think that's a useful thing to do, and if people are interested, we could consider.
John Waldron: Expanding it maybe two other gondwana in areas like North West Africa, I think it would be a great thing to do, we don't have any African or European data or any.
John Waldron: main land European data in here at the moment that enables us to pull data sets out to compare them plotting them in various different ways, like this.
John Waldron: And we noticed that we've been the data here automatically, so we can highlight in red the ediacaran the granville a blue.
John Waldron: The Bernie and 2 billion year old ages are shown up in yellow here and we can highlight those in the distribution diagrams.
John Waldron: We can also put these as pie charts using qe G is a public domain GIs on on Apps and here you can see the Magomed terrain, for example, and you can see, this he Bernie and component throughout the train also interestingly in these trains in in southern new brunswick.
John Waldron: The influx of Lorenzo derived granville material shown in blue here can be picked out as well, and we can plot time slices of these.
John Waldron: By deposition of age can also play with other kinds of plot so here i've made a ternary plot let's just go back one for a moment.
John Waldron: And i've been the data into what I call the G Pole, which is basically granville.
John Waldron: New Nepal, which has all the means approach, so we can younger Paleo protein so it's stuff that could come from Amazonia or an arranger and then an April for Africa, maybe with the.
John Waldron: ediacaran and the Iranian data together, and you can start to maybe categorize these by potential source areas now, this is not a by no means a clear cut, but at least we can come to grips with this vast amount of data.
John Waldron: Paleo magnetism has been a course widely used in making reconstructions and if the age of acquisition is known magnetism tells you a Paleo latitude, but it also the declination information has been somewhat neglected.
John Waldron: Except in this paper here, which talks about rotations crystal rotations most paler man data has just been used to constrain latitude, but there is information in the rotations and it is interesting.
John Waldron: Is a data point from Wales in the early or division and it's really very hard to satisfy without rotating estab alone yeah or the Curry terrain, at least, more or less upside down onto the margin of gondwana here very difficult to see how to avoid that.
John Waldron: So, in making a better reconstruction, we need to work backwards from the present into the past.
John Waldron: Starting with the pangea reconstruction and I naively thought starting this that everybody was agreed on the pangea reconstruction, but here, you see, they obviously are not.
John Waldron: So we do need a better pangea reconstruction to start with, and the way to do that is to use gravity, this is some work with Kim welford to use gravity to constrain the amount of stretching on the mesozoic margins.
John Waldron: For now that's work on going for now i'm going to use a reconstruction that attempts to do that by Adrian whitaker that they were good enough to share with me.
John Waldron: leading to a fit on the margin that's a little bit tighter than that commonly used because it takes into account the mesozoic stretching.
John Waldron: And we have to undo the carboniferous strike slip which we tried to do a few years back on a flat earth reconstruction i've attempted to pull that into G plates, so this is an animation of the late paleozoic possible movements.
John Waldron: Most of which were deck straw, it looks cynical here because we're running backwards in time to 370 at the end of the acadian originally when things might have been in this kind of position.
John Waldron: So going backwards in time, the next thing I want to look at is the acadian defamation and I wonder started the British Isles, because jewelry and.
John Waldron: Sorry i've lost the names for a moment appear on the slide in a moment stratton pointed out several years ago, some years ago now.
John Waldron: there's a big mismatch across the great Glen fault, where the Loch Ness monster lives in Scotland.
John Waldron: between the northern Highlands terrain here, which has a big scanned in or selenium, if you like, defamation in the mid Syrian.
John Waldron: But shows no record of ordovician grand pin to coney and defamation and the grand piano Highness, to the south, which have a very big record of Grampian definitely defamation, as the name implies and the ordovician but no scandium.
John Waldron: So they argued that these two trains in Scotland must have been located well separate from one another.
John Waldron: In the devonian and that there must have been.
John Waldron: upwards of 900 kilometers of seneschal strikes slip between these two terrains in the latest ciliary into middle devonian the acadian interval.
John Waldron: So if you try to restore that you end up putting Western island almost in Newfoundland.
John Waldron: And in order to do that, that that sinister all strikes slip has to be transferred through the rest of the appalachians somewhere, because you have to get out of the avalon train out of the way.
John Waldron: To make room for these parts of the British Isles, so there has to be Syrian strikes slip as far as we can see running through the northern appalachians or sillier into devonian I should say early devonian strikes like i'm getting ahead of myself here.
John Waldron: And so we've tentatively identified, this is the acadian line that cynical boundary.
John Waldron: That morphs from more or less ideal strike slipped in Scotland to clearly trends professional in the appalachians and it's a boundary is a huge metamorphic boundary.
John Waldron: Between rocks that show a big acadian metamorphic over print and those that don't and tentatively nine this the acadian line, after the fact, different paths company in Nova Scotia.
John Waldron: Earlier boundaries that we see in the appalachians.
John Waldron: form, I realize i'm running out of time, thank you.
John Waldron: Earlier boundaries in the appalachians include the.
John Waldron: subway line and the dog by a lion that Doug rice has worked on.
John Waldron: Which is a senior in mid Syrian boundary.
John Waldron: This boundary that surround the ordovician Syrian switch over at 440 million years that I choose to call them equity at line, after lake in central Newfoundland.
John Waldron: And earlier boundaries in the ordovician marking the creation of the Pope Logan bronson hill Arc.
John Waldron: I should say that there's quite a lot of Paleo mag data in the or division and those destinations, as I mentioned imply big internal rotations within southern Britain and Ireland.
John Waldron: And then the earliest boundaries that we see are the boundary along which the more town terrain was created in the early or division that was a paragon one and terrain, but further north that just marks the accretion of.
John Waldron: oceanic arcs to the margin.
John Waldron: all the way along the margin accretion of off continent of margin.
John Waldron: marginal blocks, like the dashboards terrain in Newfoundland and Dr radium block in Scotland.
John Waldron: So in the.
John Waldron: work in progress on the right hand side it's an animation we've animated on the disciples work on data sets using those colors that we defined earlier, and if we get this right.
John Waldron: We should see terrains not receiving granville detritus, for example, until they come within striking distance of the laurentian margin.
John Waldron: So we can bring the Paleo mag and it travels on data takeaway conclusions gandy area probably existed as a domain on the bandwagon and margin, but not as a single places across the iPad as ocean in at least five separate groups.
John Waldron: portions of gandy area might have been attached to portions of Babylonia before they arrived at rancher and maybe before they even.
John Waldron: Left gondwana.
Yvette D Kuiper: and
John Waldron: There is no single.
John Waldron: I happen to suture Thank you very much.
Yvette D Kuiper: Thank you for your mercy on you're talking to a mesmerizing with all the image with all the images and animations did we have any questions for john you could just unmute yourself and talk, if you want to encourage small enough.
John Waldron: there's a difficult question in the chat from Doug Royce I have Putnam no show but South we east of ellsworth that's where we took it with the reconstruction of the carboniferous motion Chris happened puts it Northwest correlative with annandale um.
John Waldron: Yes, comment you're in the middle of a massive carboniferous strikes that faults there.
John Waldron: Adrian park did a great talk at the agm is where he tried to dismantle the strikes clip movements through the new river terrain.
John Waldron: So I would have to play with bits and pieces on a sheet of paper before I could make them what intelligent comment, it would probably work because you have so many strikes lip faults to to to deal with there.
Yvette D Kuiper: Okay, thank you another great question everyone wants.
wintsch: whinge will just thank you for getting up which I guess was five o'clock your time I was complaining to my wife about getting up on the on the weekend of daylight savings time beginning an extra hour, but no it's for you i'm not gonna complain after that talk that was wonderful.
John Waldron: My my secret is that because all of our teaching is remote I can be as far away from our director, as I can be at the moment.
Yvette D Kuiper: He can, but I cannot see.
Yvette D Kuiper: Yes, it's early, so I would like to move on to our next talk show Oscar Christina to.
Yvette D Kuiper: Go start screen sharing while i'm introducing her, so this is.
Yvette D Kuiper: Christina Cardoso she's going to be talking about the title jerkens from the North American parasites.
cristina ACCOTTO -: Yes, can you hear me.
Yvette D Kuiper: I can hear you yeah and I can see your screen so now you just put on a plane you're in business.
cristina ACCOTTO -: yeah okay.
cristina ACCOTTO -: So thank you and welcome everybody to this presentation.
cristina ACCOTTO -: Today i'd like to talk about the evolution of the sedimentary sources that affected the North and Morocco during the earliest phases of the word, sorry very scholarly Jenny.
cristina ACCOTTO -: Do that this this interpretation is based, based on random lead gen chronological data on the titles, you can grains from the Moroccan missy does.
cristina ACCOTTO -: In there but provenance analysis.
cristina ACCOTTO -: Data will discuss in the following slides, as I say, the study area is in North America, which was part of the northern gondwana passive margin during early middle part of the time.
cristina ACCOTTO -: During late by the time the diagonal disclosure of their a caution led to the collision among the supercontinent gondwana with a number of paragon one on terrain, such as a loner, for example, and finally, with the supercontinent Lucia given origin to the.
cristina ACCOTTO -: Various can Allah ghanian origin but.
cristina ACCOTTO -: in Morocco, the policy crocs formed by the various can rajini are exposed in several domains collectively call the more can by Skype or northern Moroccan laurie's guys.
cristina ACCOTTO -: These domains are to the south, the South end zone in the anti address, which is considered to be the various comfortable and sorry then going one on foreign land of the various can belt.
cristina ACCOTTO -: to the north, the Alpine reef belt in the Caledonian apollonian several Blocker and exotic block which over trusted on the gun one marching during the ovaries current events.
cristina ACCOTTO -: In the middle, we have the moral compass data domain characterized by the cambrian carboniferous sequence Meta sedimentary sequence of the western murakami's data and Eastern rural community does.
cristina ACCOTTO -: This work is particularly focused on the erase can event, which is the earliest phases of the various can urge any.
cristina ACCOTTO -: marked by the closure of the Ray caution during the late devonian the approaching of promontory of the colonial terrain during for manian early tonight, Asian and it's collision with northern gondwana during late tonight isn't a revision time.
cristina ACCOTTO -: Therefore we collected several samples from the late devonian late carboniferous sequence of the moral come visit us in particularly we analyze to 4 million samples from vince McMahon and loomis areas.
cristina ACCOTTO -: pre-organic seven Signora gigantic to 9 million samples to from the floods and other five from the Duma come in layers.
cristina ACCOTTO -: five posts or a gigantic.
cristina ACCOTTO -: These are samples from bensley money city, but ash and loomis area and, finally, three middle late carboniferous samples from the genre the sink line in the eastern moral commentator all the samples have been.
cristina ACCOTTO -: processed in order to separated the title sequence brains that have been analyzed with lesser ablation shrimp or seems techniques, depending on their grind size.
cristina ACCOTTO -: Taking another look of the results, regardless the age of the samples and their geographic location, we can identify side some common features, for example, these important neoproterozoic peak in green always associated with a minor but still significant properties like big in yellow.
cristina ACCOTTO -: These features are not only common in the samples, but also in all the late Dr Karen early devonian samples.
cristina ACCOTTO -: already published in the moral convert.
cristina ACCOTTO -: From the Moroccan by the sky.
cristina ACCOTTO -: The neoproterozoic population is always associated with the.
cristina ACCOTTO -: Pan African and Caribbean erogenous.
cristina ACCOTTO -: While the properties like ones is related to the boolean erosion and, together with a general gap of Mr porter Zoellick data.
cristina ACCOTTO -: Or, particularly between 1.2 1.7 giga years they are the typical senior director of the West African kraton affinity.
cristina ACCOTTO -: Other common features are the stadium Tony on the titles, you can population clustered around the ones you got yours in blue here.
cristina ACCOTTO -: And the Columbia, or the vision ages, the number of grains of these ages and they are currently in in the Morocco method is quite valuable.
cristina ACCOTTO -: But they are, they are frequent frequent both in these samples and all their samples the San Antonio population has been interpreted.
cristina ACCOTTO -: As sourced from North Eastern African regions, probably there's a harmonica kraton, although the regularity of its occurrence in the Moroccan visitors during all the partners like suggest that inputs sedimentary inputs from these regions were probably an intermittent intermittent.
cristina ACCOTTO -: On the other hand, condition or the vision local sources have been called to explain grains of these ages, probably related to volcanic centers active in America visitors during the opening of the Ray caution.
cristina ACCOTTO -: In all the samples they record, they are in sorry they form, very important.
cristina ACCOTTO -: The titles, you can population but very localized in our samples, they are more irregular and they do not form a real population, so we think they are probably recycled from all their samples sorry on the rocks.
cristina ACCOTTO -: A part of these common features, there are other.
cristina ACCOTTO -: Other peculiar detritus you can population that characterize our sample so in this in the next slides I will describe these populations.
cristina ACCOTTO -: The group of samples, with the same age, in this case, we have the free organic farming and samples, and you can see, they are characterized by neoproterozoic pilot partners like.
cristina ACCOTTO -: Some cumbernauld the vision and Tony on staying in ages so nothing new nothing new, with respect, with the last slides.
cristina ACCOTTO -: But if we have a look, of the results from the synergistic samples of today's day and age.
cristina ACCOTTO -: A part of the common features.
cristina ACCOTTO -: devonian detritus ECON population appears it forms a very clear pick including nine to 18% of the data.
cristina ACCOTTO -: In the it's always associated with an increase of Mesa Arizona cages up to 9% of the data do they not form.
cristina ACCOTTO -: A very clear detritus ECON population, though.
cristina ACCOTTO -: Among the poster a gigantic vision rocks we can define two groups of samples statistically identical.
cristina ACCOTTO -: On the left, we have the bensley man samples from the eastern most part of the Moroccan data.
cristina ACCOTTO -: You can see the are quite similar to the Tunisian samples, although the devonian population is less represented is just a 4%.
cristina ACCOTTO -: On the other hand, samples from CD but dash and wilderness area are more similar to pre-organic samples, except for a few devonian and Mr Peters like grains more scattered, then in the previous.
cristina ACCOTTO -: In the senior a gigantic and bensley minute samples.
cristina ACCOTTO -: And finally, the middle upper carboniferous samples from Gerardo are very similar to pre-organic samples, except for these detritus you can population of carboniferous age ages with between 300 and 350 million years that reaches 15% of the data.
cristina ACCOTTO -: So altogether these differences can help us to to.
cristina ACCOTTO -: reconstruct the evolution of the city mentor resources in this area for the late the devonian late carboniferous period of time.
cristina ACCOTTO -: In this map.
cristina ACCOTTO -: I use the black stars to.
cristina ACCOTTO -: identify the location of Cumbrian early devonian samples published in other provenance studies, you have the references here in the.
legend.
cristina ACCOTTO -: And color the stars for the location of the samples that I just described the arrows indicate the main inputs of sediments.
cristina ACCOTTO -: So in the pure organic phase, the main source of sediments was the West African kraton, as we saw the.
cristina ACCOTTO -: characterized by the neoproterozoic Impala opportunistic detritus income populations, we also have some local conversion of division sources and some irregular input from the north eastern regions.
cristina ACCOTTO -: During to Nigerian the ocean was partially consumed in another promontory of the avalon and terrain approached northern gondwana and start to collide with this so that alone Ian terrain became an important source of sentiments for the nearby regions.
cristina ACCOTTO -: A providing the traitor devonian the try to zero con grains source from an abalone volcanic Arc active during the closure of the requisition.
cristina ACCOTTO -: and recycled meza protozoa grains from the Amazonian basement.
cristina ACCOTTO -: After the collision they have alone and terrain remain an important first primary source for certain areas, for example, the benzene man in Beijing.
cristina ACCOTTO -: While other visa samples contain only a few devonian in miss opportunities like grains probably recycle the from all the rocks or slightly all the rocks.
cristina ACCOTTO -: In the eastern moral compass data at the front of the collision and area.
cristina ACCOTTO -: The crystal thickening and subsequent thurman moderation of the gondwana crust.
cristina ACCOTTO -: Due to the collision triggered the formation of the first.
cristina ACCOTTO -: Very scan granny toys that in late carboniferous became a source of sediments for the nearby regions.
cristina ACCOTTO -: In this map I use this plus symbol to identify the location of the various communities that have.
cristina ACCOTTO -: ages compatible with those we found in our samples.
cristina ACCOTTO -: So in conclusion.
cristina ACCOTTO -: The West African kraton was the most important in stable source of sediments in North America during all the time, together with some Lucas combined or division sources and intermittent inputs from the North East Africa regions.
cristina ACCOTTO -: The presence of devonian in Missouri territory grains in carboniferous rocks said, support and suggest that the approaching of the colonial terrain to northern gondwana that became an important source of sediment seems to know is in time.
cristina ACCOTTO -: After the collision the formation or the.
cristina ACCOTTO -: The.
cristina ACCOTTO -: Sorry, the formation of granita it's in the.
cristina ACCOTTO -: In the frontal area.
cristina ACCOTTO -: Also.
cristina ACCOTTO -: became an important source of sediments for the nearby regions in late can be sorry late carboniferous rocks.
cristina ACCOTTO -: that's it, thank you for your attention.
and
Yvette D Kuiper: Thank you Christina.
cristina ACCOTTO -: and trying to close the show can.
Yvette D Kuiper: You click again on the share screen at the bottom.
Yvette D Kuiper: And still.
Yvette D Kuiper: don't stop share this should be a red stop share button somewhere, if you hover.
cristina ACCOTTO -: Okay yeah I.
Yvette D Kuiper: Thought.
cristina ACCOTTO -: I was looking in the wrong screen.
Yvette D Kuiper: No worries any questions for Christina.
Yvette D Kuiper: Javier ISM business, we have five minutes, though we don't have to.
Yvette D Kuiper: rush them.
Douglas Reusch: I have a question.
Douglas Reusch: What is their sedimentary evidence, for these are cons that are coming from the East versus the potential source and Mauritania, where i'd like Bradley has documented Sir kinds of that age.
cristina ACCOTTO -: A basically an.
cristina ACCOTTO -: email, Britannia or Amazonian all this terrain, we have one jira years ages, but we also have.
cristina ACCOTTO -: 1.5 other Mr Peters like ages and in the samples that we studied in in various can.
cristina ACCOTTO -: model canvas guide and other studies we also we only find the 1.0 GPA years we have a lack of all the muscle protein soy cages so.
cristina ACCOTTO -: We think that it's quite impossible that sediments from.
cristina ACCOTTO -: From Mauritania, for example, bringing only a part of these now in Mesa Professor cages, and not all the range wailing.
cristina ACCOTTO -: In this matter kraton they have only these.
cristina ACCOTTO -: These intervals of ages, so it is more, we think it's more.
cristina ACCOTTO -: probable that they come from the DC region.
Douglas Reusch: Okay, thanks.
cristina ACCOTTO -: you're welcome.
Yvette D Kuiper: Any other questions.
John Waldron: I guess I could ask a question.
John Waldron: Although it it, it may not have a good answer um if if abalone started somewhere adjacent to Northwest Africa when you're seeing your apollonian sources.
John Waldron: Am I right that there would be no way to tell whether that was abalone as in the appalachians or a piece of Babylonia that stayed behind.
John Waldron: A at the beginning of the paleozoic and was always attached to Northwest Africa.
cristina ACCOTTO -: You right I didn't have a good question good answer.
John Waldron: i'm not sure there is one, but it was a for had while I was watching your talk so I don't know that there would be a good way to resolve that.
cristina ACCOTTO -: I i'm not sure about that, but in any case, we think that these promontory of apollonian.
cristina ACCOTTO -: Is.
cristina ACCOTTO -: is now exposed in the same block in within North America and also in the Southwestern Iberia, in the south Portuguese zone and data from South Southwest Iberia show that samples from these terrain as a lot of green villain ages right.
cristina ACCOTTO -: That are not not common at all in Morocco, so we think this terrain drift away a certain young from gondwana and came back.
John Waldron: And was in contact with arranger.
John Waldron: yeah yeah no that would do it yeah Thank you.
cristina ACCOTTO -: Is there is the only evidence if.
Yvette D Kuiper: We have time for one one quick one if anyone wants to.
Yvette D Kuiper: That was hard question.
Yvette D Kuiper: Good like in the case of Allah i'll spend some time having happiest setup here, the only just join the meeting, so how here which will do a screen share the screen So what did you realize you're able to do.
Yvette D Kuiper: There you go.
Yvette D Kuiper: You can yeah show you comfortable you know what to do.
Javier Alvaro: So thank you for.
Javier Alvaro: your invitation to you event Center for having me this morning was I was anything else is fine.
Javier Alvaro: i'm able to display today compression or some Korean drift closer to what we call an address or summary summary brief thinking North West Africa answer with you, with Western alani.
Javier Alvaro: As you know, the acid mining condition of different healing signatory style that riff buses emerging areas, they are only vacation thicknesses face information with one thing and do some raid.
Javier Alvaro: controller by family into associations, as a result, this is the perfect place to important interpolate a static motivation.
Javier Alvaro: However, in on the routine condition, this is characterized by shaming education in Nepal isn't space, so any journalists must face problems with.
Javier Alvaro: Teachers inventory faulting look until Tina of leaf blocks tectonic collison disassociate once in court and simple, so what kind of interaction and influence.
Javier Alvaro: There are three important unconformity is here that can be used for corporation first one is separating the brief 30 minutes from the roof on his phone here visit the career confronting.
Javier Alvaro: The last one is the post roof or brick up for meeting separate industry so removed from the process matching conditions sealing the word structure.
Javier Alvaro: And finally, in between in every city months and it's possible to find several hours in brief formalities, some of them are local or regional and then even cross the world with framework.
Javier Alvaro: So let me introduce what we call Cumbrian adolescence somewhere in our North American brief, we have a link in here Morocco with this solar eclipse folders and separate.
Javier Alvaro: and dear to us on his cell phone higher to that from the North and West Coast on Michigan this is really up to the matter good where's rotation, and this is friends with American massive on the opposite fundamental this health.
Javier Alvaro: exclusive one parent and it by African colonial shoot on here market in rare or would you come down with access the mainland.
Javier Alvaro: The county address may or fourth year is full of affinity romance on African origin, and this is the current African teacher.
Javier Alvaro: laterally become the correlated with the contact for their support Center over to someone I saw him in finally splitting into two different sexual wounding the central Oregon domain.
Javier Alvaro: By contrast, can actually scan the fear and perpendicular to the Pan African shooter he's more Esperanto to overcome and shooters.
Javier Alvaro: So i'm going to focus some examples from the anti God levitating is very similar to the was our only and segment per server, so I am just summarizing the subtler fate of the company and welcome here, which is sandwiches between two important cups one here separating the.
Javier Alvaro: transition which is a brief the brick up unconformity is here, and if longer which is normally absent, except in one area in the Center it out to us.
Javier Alvaro: And in between, there are several sin riff on performative, this is the most important because can be over consumed dig up throughout the world roof, and there are other ones have local and regional interests and want to make sure difference here.
Javier Alvaro: So the beginning of the race condition are represented by the bosses and i'll break champ on ruminate on sort of common rates.
Javier Alvaro: Or the member of that information under represented the infield of Robin robbins, this is the beginning of extinction and condition and from one domain developer, fear and to whereas plus of conditions.
Javier Alvaro: Before the end of the w member of the top, they are they begin to trust somebody from confirm it is this is from the cell phone.
Javier Alvaro: With some tectonic Britain ups here in.
Javier Alvaro: carbonate course separating the horse and Robin matic tamika came in.
Javier Alvaro: bluish point on here, these are four states, even when we just see in branch for their carbonates.
Javier Alvaro: And it's full of sensitive entire force and we're working with a bachelor's in boarding facility chiropractic class, so this is the beginning of external conditions operating costs and robbins and beverly always are involved with with activity.
Javier Alvaro: This area is reported by their important copper or believes associated with a certain activity, including fruits hot acidic.
Javier Alvaro: Developing caustic cartons such this is strictly fee waiver several properties and the corporate Canada or us to different minerals, no money so five cosign on that earlier oxidize by could practice.
Javier Alvaro: So, once this veins either televisions are your order of work on understanding enter the report winch.
Javier Alvaro: cool great class and combining some for psychic gun owner we're kind of scenario plus so the further we can find this thing either terminal minerals, have a world class implied rates instrumental activities this activity.
Javier Alvaro: Another something i'm going to convert later with Somalia is the person of unimportant gap unconformity crossing the lower media coming in transition.
Javier Alvaro: This landscape is taking from cell surgeon near near English is possible to recognize nicely landscape of do more successful with different information so gymnast linoleum any activity.
Javier Alvaro: here to solve this an important angular this for dance with on login have asked me for mentioned, which is double or Korean and a typical policy to.
Javier Alvaro: shares or near comment, I was what mentioned so w clothes are uplifting off a horse erosion tilting on on Latin or different from mention on this fellow relief.
Javier Alvaro: Under the ocean, or will turn it on, and only the war and torture comment here in nigga.
Javier Alvaro: To pick up and learn from it, it is well represented or Caspian better I started in central 90 at us.
Javier Alvaro: which he represented by these deposits wrong yeah except in the steaming area of the Center of the others which are percent of our other.
Javier Alvaro: you follow the air roshan it was it contact or the sprint cup unconformity, especially with our friends here so i'm extension on movement with growing.
Javier Alvaro: And segmentation and evolution of course here to relay information, information is that office, whether it be represented chin and in DC Robin area is also want to recognize some contingent on the boss's boss, the contract affected, also like to terminate it.
Javier Alvaro: is coming and we're gonna see here by this.
Javier Alvaro: hockey in deposits, which song either turn my pockets and feel with in particular out directly to me as a reward and included to scene.
Javier Alvaro: For the purposes of their or an official information so and normally this on performative involved in setting up a ups team activity to the university Minnesota in some cases up with some books.
Javier Alvaro: So can we recognize this kind of.
Javier Alvaro: unconformity thing Wester on discussing Western Rania it comes to data some example from the campaign soda and.
Javier Alvaro: I don't want anything new this week for comparison.
Javier Alvaro: Different here has been the anti personally, it was important cups obesity graphic Marcus based on the lack of.
Javier Alvaro: Resources for Julian or the person of faith related economic losses which went nowhere and valley for correlation.
Javier Alvaro: But in the list reiki there are new papers, for we sit on academics, because we in this code, but as a sample workers, which for me to.
Javier Alvaro: make a proper or better confident more confident correlation so i'm going to say select three unconformity here in the beginning of researching imitation monteith as we described in the.
Javier Alvaro: 80s and to see improvement opportunities one random one of these contacts into the TV and she may not have so in a closet or may come in transition, or central and the others were over road coming up from Michigan for support information is directly overlaying.
Javier Alvaro: are related to mathematics give yourself a niche.
Javier Alvaro: So I see in the inner the 80s and 90s, it was there some colleagues theater I began to describe the President of living in enough.
Javier Alvaro: segmentation in Korea in the color monta sweater vital information so mimicking the occurrence of who we are and through the unofficial bridge uncommon I deposited or lay in Romans Romans hypersensitivity non eXtensible uses.
Javier Alvaro: This example is representative, because we have we can find on both ends up here or the Foster point carbonates overlay uncorrupted basement or the world.
Javier Alvaro: Where I need complicity canning he presented the Gospel for Union and there is a conflict conversations, to show them intentional here so again and we make in the octave of course you're also teaching on on a lot of.
Javier Alvaro: segmentation the end of every company on on encrypted reasoning.
Javier Alvaro: And that's example comes from sunny side with the wrong one of his direct contact with this very nice easy to change colors from the greenish.
Javier Alvaro: sandstone of the random formation pinkish carbon So when I said permission, you can recognize some work to us sources from the underlying information, it was indeed one of his Tucker and it's important to recognize to separate.
Javier Alvaro: score interfaces in cross device on at least some of them are engaging productive prismatic on neither precipitated in between different so much, I mean.
Javier Alvaro: Some of this, of course, because this rocks has been rewarded again to dimension in the light information as they push it so reflecting this instrument, our character.
Javier Alvaro: In it.
Javier Alvaro: So.
Javier Alvaro: It would read to make whiskey correlation of one machine of little Morocco area or Monica with with someone and we've seen that we can find some similarities and differences, there are three important.
John Waldron: Up ski but I not going to.
Javier Alvaro: describe do it Nancy and virginica i'm going to focus first on the Pan African Omega.
Javier Alvaro: The beginning offer comments, in addition, with the progress unconformity is, of course, and diagnose, this is reflecting the decline and horse can develop it in the anti war or puzzle Nice and Martin and the edge of this and April, and I was very.
Javier Alvaro: uncomfortable is turning out to me.
Javier Alvaro: We have here in relish or on the free sentiments and the beginning of the classic margin sediments separated my they broke up unconformity me really I will conduct a total Iranian unconformity America has been deployed and.
Javier Alvaro: Not manda.
Javier Alvaro: And again, we have here the every phone call from Mickey was a nice criminals conductor, ranging from who sang cheon needed to pay them in a niche in a very or half an hour.
Javier Alvaro: Then, representing during quarter, namely the order for them to robeson of.
Javier Alvaro: Someone owning and under plating yielding fantasy calculating mathematically episodes per person here, but can be upsetting auntie and in America.
Javier Alvaro: We can brand that was there was alone, we can find some similarities, for instance, the decorative scatter the beginning of the comments invitation and the rift condition.
Javier Alvaro: Which is awesome brilliant from turning it around to the internal vm and there are more products to recognize do so call it.
Javier Alvaro: up here because there's only a sanguine go under your absence of ultra Saturn under know do something.
Javier Alvaro: So, in any case, we can recognize the scene important similarities between the brief pick up on Friday and raise your now to loca simply from conformity is the most important.
Javier Alvaro: Information on the little here is a present of decorations and confirm it is don't they got no corporately I suppose for coordination.
Javier Alvaro: So, and in the radio, we are suggesting one idea for correlating designer sample from it is selected an image police do by brandon mafia workers when they are placing along in front of was doing come in times, there are other models have brought.
Javier Alvaro: us closer to Monica but I like this morning because and they agreed with some ideas they are trying to discuss with your run with other.
Javier Alvaro: Colleagues missing, which is very is the cross to the eastern Oregon vehicles to Western all along, we have here and do.
Javier Alvaro: fixer aspect on this earth has been trying to just trade and the conclusion of the story is that each of the segments or fifth branches develop any data comes when we were proposing are simply like 15 preparation, because they in have.
Javier Alvaro: got only one or our conditions are in the current in the Union African nation was not extinct.
Javier Alvaro: And they were only developing she played Christian procreation, in the same way that the roof roof transition was.
Javier Alvaro: Developing typical orthogonal extension, on condition, but broadly.
Yvette D Kuiper: Developing a sequel a.
provision.
Javier Alvaro: And just only was the one who else would do two things, or people has been has been in the field from Western European, and I think, so thank you for your attention.
Yvette D Kuiper: Thank you very much, and the great job on presenting well just dropping in very impressive to do we do we have any questions for have you I don't know if I pronounce your name raise.
Roger Bloch: My video going hi it's Roger block.
Roger Bloch: and beautiful wonderful talk, I was just thinking about these sort of things, last night, so it's very great to hear this.
Roger Bloch: Am I right to see that if you look at the age of the.
Roger Bloch: rocks overlying the breakup unconformity you would see it die acronis but on your kronos strata graphic chart, it is possible, they were all the same time, because the rocks below that seemed to be all a certain age and older.
Javier Alvaro: Oh, the margin drops 4% sanitation.
Javier Alvaro: Hospitals after.
Javier Alvaro: The referrals but the beginning of the Marine or the continuous limitation is.
Roger Bloch: i'm sorry I talked over you.
Javier Alvaro: know the beginning of seeming decent after the after the various posture by erosion and the robot proceeded minutes is not a soccer moms.
Roger Bloch: Right.
Javier Alvaro: You can begin before, because we have to go in and they are nowhere in here so she will be here after what is an extensive electronic here.
Javier Alvaro: So the infield describing is in different times right.
Roger Bloch: Exactly but it, but your data shows that they could all the event that tectonic event could have been can synchronize across the whole time because the rocks below it are consistently a certain age and older Is that correct.
Javier Alvaro: Yes, nothing you know annual, yes, but the no segmentation and the end of every condition and the beginning is limited, so I mean the passing medical condition another thing yep.
Roger Bloch: Thank you, excellent.
Javier Alvaro: Thanks for.
Yvette D Kuiper: Any other questions.
Sa?d Belkacim: Yes, please.
Yvette D Kuiper: Go ahead.
Sa?d Belkacim: Okay, thank you, so thank you for your interest in talk.
Sa?d Belkacim: Do you have a main question is, do you have any comments on.
Sa?d Belkacim: On cambrian magma cheese and that's that that is recorded in Morocco.
Sa?d Belkacim: For example, people who are going in and getting.
Sa?d Belkacim: Much isn't or either some content not totally each record recorded in the Atlas Thank you yeah.
Javier Alvaro: Thanks they suffer lay public I don't know you know him.
Javier Alvaro: And board is a process created in this work inquisitive was analysis, the different.
Javier Alvaro: Police ECON alkaline up, and it is, it is a dominance of 3232 income earner in the manian to the lesson, there are three or four only ultimately cycling in affinity.
Javier Alvaro: What we're proposing this work is probably the alkaline magnetism and was deeper sister from from the upper Monterey area, whereas the total at was the mantle.
Javier Alvaro: Cross contact, so we suggested that peroni both affinity or related to different depths of marine or the mandate you cannot develop it in.
Javier Alvaro: mathematician because it was only 15 minutes we had our focuses on the unconformity, but I think that in Morocco.
Javier Alvaro: The magnetism on the roof is when studying now and then every year, the new papers that are completing the role idea.
Javier Alvaro: And I called up to this time next door key focuses on mathematician in Babylonia in western Oregon yeah and it will be very interesting, the one day we can make operation of the time and affinity or different particularly, that is, between person alone yeah.
Sa?d Belkacim: Thank you.
Thank you.
Yvette D Kuiper: Okay, thank you all very much.
Yvette D Kuiper: So i'll move on to the next speaker before we do that, I realized I forgot to introduce the http protocol years where Friday and I will run the show in a minute.
Yvette D Kuiper: So now barn feel armanti are all going to be here today and sorry Belka team, so we cannot divide up the session so from here on Friday, we will do the introduction, so it gives the written word, yes, yes.
faouziya haissen: Yes, thank you, that so.
faouziya haissen: Thank you for being on here and the participating in this session and the older tours are interesting for for our project, and I hope you will be involved with more and more with our projects, so we will move to the next talk with meals Andrea I hope i'm not seeing good the.
faouziya haissen: Who we talk about little stuff you guys Keep it up the mystery and the Iranian need the different page constraints of volcanic rocks of one of these convenience peninsula, so the floor yours, you can share your presentation and talk, thank you.
faouziya haissen: I don't know if the if the speaker parking.
andreamills: Okay, just one second i'm just I have to move this.
faouziya haissen: Okay.
Sorry.
andreamills: There we go.
andreamills: Okay, so i'm going to provide an update on.
andreamills: What we know about the avalon terrain in its type locality in.
andreamills: Babylonia in Newfoundland, particularly in the area i've been working for for some time with colleagues Greg downing from Monday and Shannon from the geological survey.
andreamills: On the bonneville peninsula and in particular.
andreamills: Work on volcanic rocks of the most Cape Town group.
andreamills: So i'll start with an overview of.
andreamills: Babylonian mock the new Finland and then get into bonobos to peninsula volcanic rocks their strategic rfi.
andreamills: Uranium lead.
andreamills: Age constraints, starting from the oldest to the youngest and then talk about the geochemistry and the implications of our work.
andreamills: So many of you are familiar with this.
andreamills: map put together originally by Coleman sod and others in 1990 couple of minor changes i've made and i'll get into that now, in a second.
andreamills: um first i'd like to start with them, just to some of the literature that provides good summaries for apollonian Newfoundland.
andreamills: In particular, my rose summary paper in 1995, which is still very relevant and he highlights some of the knowledge gaps which still exists today case for install and others in 2020 just last year published a paper that summarizes.
andreamills: abalone it and, in particular, some of our new do chronology.
andreamills: So it was formerly viewed as as minimally to form terrain with alternating hot mag high lows that you know sort of resemble a rock carpet.
andreamills: And you know wasn't really seem to be.
andreamills: torn apart substantially or anything, however.
andreamills: Although we don't have really new data.
andreamills: From from the time that.
andreamills: These earlier ideas of all.
andreamills: We did reprocess the data and it shows that, perhaps, things are a little more complicated than we initially realized, you can see here that.
andreamills: While there's you know the the continuity of the eastern mag high is still you know.
andreamills: Clear, but the Western mag high seems to have a mag low transacting it sort of through the isthmus.
andreamills: We get a laser.
andreamills: yeah so so coming through here and i've just so shown some of the age constraints that we have.
andreamills: For the northwestern and southeastern part of Babylonia So these are all sort of probably Paleo topographic ha's.
andreamills: and
andreamills: So part of what we need to consider is you know the similarities between these mag highs.
andreamills: OK, so the core of the avalon peninsulas underlying by the oldest rocks of the avalon train the new land the 730 Hawk hills so cries Jenny into or Tony into Credit Union.
andreamills: rocks outcrop there and really only there and they're included by.
andreamills: 614 months and I need and circus 620 holy rude intrusive sweet mean the Granite toy box.
andreamills: In the north western part of the terrain, we we don't see whoops.
andreamills: We don't see much in the way of Platonic rocks at all, we have a small relative of categorical and Arc like rocks right up near the joker fault.
andreamills: And then we get into the adjacent basic locks of the connecting point group and so that's that'll take us into the bonus to financially in this area here.
andreamills: Is this preliminary map of the bonneville Peninsula and the volcanic so i'm going to focus on the oldest ones are in these headlands that shut out into bonneville debate here.
andreamills: And then the they mark the base of the most grave town group in Newfoundland.
andreamills: So on the eastern most of these three commentaries the young conformity between.
andreamills: The connecting point group terminates and overlying coarse grained rocks of the Moscow town group.
andreamills: is exposed on the eastern side of the peninsula, but as bolted on the Western side.
andreamills: So and we've constrained now the age of this this unconformity and the age of the base of the Muslim TIM, which was previously unknown, so this is the steeply dipping.
andreamills: sort of medium to thin bedded.
andreamills: turbid attic and two phases rocks of the connecting point group upper connecting point group, you can see there interpolated with ripple mar.
andreamills: silt stones to find sands Jones, and this is the truth we dated and it's all faulted and overlaying by basalts of the lower musgrave town group.
andreamills: So this is the tough, you can see there's a lot of lifting class and but we were able to get an inch which we think is reliable of based on overlapping zircons for fractions that overlap with an age of 605.
andreamills: And then on the eastern side of the same peninsula, you can see the unconformity here, so the field assistant is standing on the connecting point group rocks and you can see the regular surface of the unconformity and the shallowly North dipping rocks of the overlying based on my screen.
andreamills: And this photo was is just 100 meters to the north, we dated this this two year above the conglomerate go back into conglomerate and then we're into.
andreamills: The salts.
andreamills: So this is the crystal tough that we dated.
andreamills: We got some nice prismatic zircons and the youngest one given age of 600 plus or minus three.
andreamills: And then, further to the east, we have the plate code volcanic belt, which is a composite belt and it's comprised of basalt into bed with sand stones stones some lovely Columbia join today on the site and violate with composers.
andreamills: Generally overlying most of the results for the most part, but the belt is.
andreamills: Is faulted throughout.
andreamills: So on the Western side of the belt women's to data, there was several trial trials before we were successful with it.
andreamills: But you can see, this to have here, you can see some glass shards in the thin section.
andreamills: Too dark on populations were isolated we dated only zircons from the prismatic population got an age of 592 and an older inherited.
andreamills: faction.
andreamills: And then from the eastern side of the volcanic belt.
andreamills: We found a disability tough.
andreamills: With.
andreamills: Realistic class that show thermal cracks so that we think that these are not you know.
andreamills: exotic blocks, they were incorporated while they were still hot.
andreamills: And the zircons we got their game overlapping ages can coordinate ages 591.
andreamills: So that's it for the.
andreamills: up the ages, that that we've generated are further constraints on on volcanic comes from the relative position of the volcanic to.
andreamills: The one good marker horizon within the most part of town group known as the Trinity faces, which was first reported by Leon norm or my predecessor, who isolated some straight to class and described the rocks well and then some years later Judy poo and others.
andreamills: constraint, the age of this time glacial dynamic tight.
andreamills: By dating tips above and below and golden age of five at which allowed them to correlate the tourney faces with the gas occurs formation on avalon peninsula.
andreamills: So the next volcanic unit i'm going to talk about is.
andreamills: From the northeastern part of the peninsula in this area here and it's mostly.
andreamills: fried mental or breath creative basalts some flows it's overlaying by spelt stones that are in turn overlaying by the Trinity faces dynamic type, which is shown on the map here and pink.
andreamills: So it out crops there and that's the most voluminous.
andreamills: basalt magma away from the plate cove belt, but there are also some very small lenses down in this area here where beds are some vertical highly faulted.
andreamills: And, but we do think it's just above the the Trinity dynamic tightness area here and then down in the Southwestern part.
andreamills: bonaventure head, which is where Judy poo and others dated the Trinity faces.
andreamills: There you can see the basalt bridge to about 50 meters above the top of the time is tight.
andreamills: And the final volcanic unit i'm going to talk about is just south of my map area sense of strictest sense of strict oh.
andreamills: So.
andreamills: bonaventure just to orient yourself bonaventure head is down here, and this is bonaventure head here so.
andreamills: The, this is the unit that was dated by poo and others.
andreamills: And there's a volcanic above right here and there, and they're further of all kind of classics and.
andreamills: Some flows and more flows in a glamorous down in this area here on random island and Ireland Ireland.
andreamills: So just to talk a little now about the the geochemistry.
andreamills: i've color coded the units all the matrix are in cold colors and the the file sucks or in warm colors.
andreamills: purple for the end of sites.
andreamills: So the headline basalts was the oldest and there's an age constraint on those as being 600 MMA roughly.
andreamills: And they're thrown in the blue cross's.
andreamills: And then within the title belt, we have these blue Paco volcanic the thoughts to sort of sets to series, the end of sites, there are two groups.
andreamills: The there to that occur in the headlands and then the bulk of them occur within the play called belt.
andreamills: And then the all the realistic rocks are from the plates move belt and units above.
andreamills: Or the alkaline basalts shown in green here that include the damn pond the salts as well as the ones down in British harbor area.
andreamills: And just to show where they are relative to the Trinity faces.
andreamills: The dam pond is below the bonaventure head basalt is just above and the British harbor results are well above.
andreamills: So when we look at the extended version filament plots, we can see that the headlamp assault.
andreamills: is like rare earth elements enriched with troughs for nine o bm and they're counting and pass them a high field strength elements.
andreamills: So these are look like cal cal Colin rocks.
andreamills: The and insights that the headlands are are the steeper ones, and then within the vault the play co volcanic belt the the the flatter looking into sites.
andreamills: and similar to the basalts in the plate coat belt, which are quite flash these are interpreted as continental so the ice because they're very, very subdued minor my opium anomaly and variable draconian and halftime.
andreamills: But much, much flatter than the the headline basalts both the damn pond basalts and the British harbor basalts have sort of a bit of a concave down.
andreamills: pattern in the light where element range mostly because of the high Nairobi him in these rocks because there are alkaline.
andreamills: So just a couple of discrimination diagrams to show the position of these rocks the calc alkaline ones from the headline basalts shown here.
andreamills: And then the the sort of range of the plate cove results.
andreamills: interpreted as continental 38 and then the alkaline the salts.
andreamills: The earlier damn pond ones are like and the later British harbor basalts or more eat more like so they're coming from.
andreamills: enriched.
andreamills: mantle.
andreamills: And the violates from the plate code belt are rare earth elements of rich and rich and most of the trace elements.
andreamills: And fairly flash alkaline basalts which you can see, on the zone, so there a two according to the classification of Nelson heavy 1992.
andreamills: So these are interpreted to be melts of pre existing Arc type crossed in an extension machine.
andreamills: So this just shows the distribution of all the different rocks that we've looked at.
andreamills: Their chemistry is are coded the same as the.
andreamills: As in the discrimination diagrams has i'm salts.
andreamills: The and insights and then the play called the salts and then we get into the file six.
andreamills: and
andreamills: damn pond up here, of course, and then the British harbor down to the South West.
andreamills: So we see a changing source over time and, most of these rocks are telling us that there was extension when they were included.
andreamills: And it had to start sometime around the.
andreamills: and must have been episodic because we see it pre five at based on strata graphic position the Dan pompe assaults and post five at based on the position of the.
andreamills: British harbor assaults, so I think we need to think of the most grave town group as an extension ol basin and is not correlative to signal hill group on on Western avalon terrain, as was previously proposed.
andreamills: So when we compare just grossly the picker field participant in.
Yvette D Kuiper: India.
To me okay.
andreamills: there's not a lot of similarity and as i've said.
andreamills: The most grave town group is not relative to the much younger signal hill group, but some of the volcanic within it, maybe relative to some of the volcanic within.
andreamills: The harbor main group which is which needs revision.
andreamills: And just to acknowledge my my colleagues my field assistance and show the rest, the reference overused and say thank you for your attention.
faouziya haissen: Thank you, Andrea so we have time for one quick question if there is anyone who wants to ask, please unmute your MIC and ask Courtney.
faouziya haissen: Any Christian faith.
wintsch: winch as a question.
wintsch: And you tell us when these rocks were deformed they're all very shallow crust but there's lots of structure in them when did that happen.
andreamills: Well, that has been.
andreamills: The albatross around my neck, I guess, because it's a we don't have young box to to show.
andreamills: And we don't see we don't have dikes that that.
andreamills: That.
andreamills: cut.
andreamills: structures that so the.
andreamills: loosely.
andreamills: We are we know we have some neoproterozoic defamation, particularly with in the connecting point groups so that was sort of the turbo date dominated brown unit in the western part of the map area.
andreamills: And then there was the north directed thrust invocation at that point and it must have preceded deposition of bazell musgrave TIM group and we also know that there had to be post.
andreamills: 565 ish northwestern defamation because down in the area.
andreamills: On the southern part of the peninsula there's a few fossils at akron fossils as padilla that are caught up in this.
andreamills: steeply dipping terrain, that I pointed out where the the beds are also vertical.
andreamills: So, at some time post deposition of these ED accurate and bearing fossil bearing rocks there, there was north to Northwest.
andreamills: Congressional defamation, but we haven't really been able to.
andreamills: constrain and then there's there's a later east, west compression compress it phase as well, which we haven't been able to bracket is broadly thought to be perhaps devonian in age, but we've still got a ways to go to constrain or defamation story.
faouziya haissen: Thank you, so we got to move to the next presentation.
faouziya haissen: Who will be done.
Two minutes.
faouziya haissen: Who will be given my by Alexandra nagar may or metamorphic evolution of the south western part of the Mediterranean Nova Scotia Canada, so please Andrea can you.
Okay.
faouziya haissen: Go ahead, please.
Allie Nagurney (she/her): All right, thank you so much can everyone hear me.
Allie Nagurney (she/her): yeah okay great so.
Allie Nagurney (she/her): um to start off I kind of wanted to frame this talk a little bit in terms of the session title, which is the pre Atlantic geological connections across North West Africa.
faouziya haissen: Southern Europe.
Allie Nagurney (she/her): and Eastern North America.
Allie Nagurney (she/her): and specifically today during this talk i'm going to be discussing on some work i've done as part of my PhD on.
Allie Nagurney (she/her): The metamorphic ISM of the Laguna terrain, which is the most outboard terrain, of the appalachian origin and currently outcrops today in southern Nova Scotia.
Allie Nagurney (she/her): and specifically i'm going to be asking What information can the metamorphic rocks of the moon, the terrain tell us about the metamorphic and tectonic evolution of Eastern North America.
Allie Nagurney (she/her): So as a brief overview of the kind of geologic history of the.
Yvette D Kuiper: weekend, can you please go to speaker modes.
Yvette D Kuiper: On your own like play the slideshow so it fills the whole screen.
Allie Nagurney (she/her): it's showing it on my screen give me one second.
Yvette D Kuiper: It shows, like all your slides.
Allie Nagurney (she/her): Oh sorry about that.
Allie Nagurney (she/her): Is this better now.
Yvette D Kuiper: Yes, okay perfect.
Allie Nagurney (she/her): Okay perfect someone had to have the technical issue eventually so take that one for the team.
Allie Nagurney (she/her): But yeah so looking at a little bit of the geologic background of the moon, the train is it's shown here and yellow and.
Allie Nagurney (she/her): About you know 450 to 390 million years ago it was thrust over the avalon terrain, to the West, which resulted in regional green shirts faces metamorphic ISM across the train.
Allie Nagurney (she/her): And then, at about 373 million years ago on there was break off of the slab or denomination of the low alyssa sphere, which resulted in a stratosphere upwelling which melted the machinima crossed and created extensive gratitude magnetism and gratitude plutonium.
Allie Nagurney (she/her): and put together that results in a geologic map of the movement train that looks something like this today, where the granted toward rocks are shown in.
Allie Nagurney (she/her): pink and the metamorphic map is shown on in the Rainbow colors going from claret grade and in yellow up to eliminate quarter right and belt in purple.
Allie Nagurney (she/her): And kind of looking at this distribution of metamorphic rocks specifically in relationship to the blue tones both the south mountain battling as well as the peripheral blue tones in the southwest it's kind of unclear what the relationship between.
Allie Nagurney (she/her): metamorphic ISM and Pluto 10 is it is which kind of leads to this big question of what were the driving forces of metamorphosis in the movement train.
Allie Nagurney (she/her): Was metamorphosis primarily driven by kind of a regional metamorphic event or specifically in the southwest was metamorphosis really driven by the heat from these intrude include times.
Allie Nagurney (she/her): And in order to explore this question i'm first going to look at metamorphic PT conditions across them agreement trade as well as look at the number of metamorphic events kind of recorded and some of these rocks.
Allie Nagurney (she/her): and specifically i'm going to be looking a lot at some rocks from the barrington passage area, so I will zoom in on that area now.
Allie Nagurney (she/her): we're now here's geologic map of the barrington passage area with the barrington passage Pluto on a tonal light two quarts direct shredded pink.
Allie Nagurney (she/her): And the metamorphic ice grads are shown as well, so first i'm gonna highlight kind of in detail one sample and then give some brief overview of few other samples we looked at.
Allie Nagurney (she/her): So the first sample i'm going to be showing you guys on here some PETRA graphic.
Allie Nagurney (she/her): photos of it, looking at it is a garnet store like chest, we can see that there is a dominant planar affiliation that it appears that both garden and store like overgrow.
Allie Nagurney (she/her): So next you wanted to play some quantitative pressure temperature constraints on this rock so to do that, we on us the folk rock composition calculated over range of pressures and temperatures, the.
Allie Nagurney (she/her): equilibrium mineralogy mineral composition and marrow modes I compare that to the those data in art rock.
Allie Nagurney (she/her): And what we can see here is showing pressure on the y axis temperature on the X axis and i've just simplify this diagram to show some of the major mineral in reactions.
Allie Nagurney (she/her): And we can see that the peak assemblage in our calculated phase equilibrium diagram matches the peak assemblage that we see in the rock at around 590 degrees C and four kilowatt hours.
Allie Nagurney (she/her): And I just want to make a note here that this sample you know it's reached.
Allie Nagurney (she/her): Almost 600 degrees is about it's more than five kilometers away from the futon which you know when you think about metamorphic heating that's probably a little bit too far away from.
Allie Nagurney (she/her): Grenada clue on that would, if that would basically be the result of contact for him, so we believe that that is more likely that this samples are result of kind of some regional metamorphic sequence.
Allie Nagurney (she/her): And the next thing I want to look at with this rock is on basically we ended up using this rock as kind of a case study of garnet crystallization.
Allie Nagurney (she/her): Because garnets and important metamorphic mineral but the atomic scale processes by which it crystallizes are poorly constraint.
Allie Nagurney (she/her): and specifically to do that, we looked at electron backscatter diffraction or EBS data on the orientation of garnet crystals.
Allie Nagurney (she/her): As well as X Ray CT data on the 3D location and size of garden crystals and first i'll just quickly highlight our EBS D results.
Allie Nagurney (she/her): Where we looked at the crystal direction of garnet that was parallel to the revelation for about 15 different guarded crystals in this rock.
Allie Nagurney (she/her): And i've just highlighted a couple examples here, and these garnet crystals are color coded for the crystal direction of garnet that's parallel to the affiliation.
Allie Nagurney (she/her): So the next thing we did was plot up all those crystal directions on a crystal structure model of garnet.
Allie Nagurney (she/her): And what we found is that all 15 of our analyze guided crystal had one of three crystal directions, parallel to the revelation.
Allie Nagurney (she/her): And Bradley we interpret that as an epitaph to negotiation process by which garnet crystallizes using the crystal structure of muscovite.
Allie Nagurney (she/her): And if you're interested in learning a little bit more about that we do have a paper and press that should hopefully be published sometime later this month.
Allie Nagurney (she/her): And now moving on to the X rays CT data, where i'm showing on the right, the 3D scan of the rock and on the left, I have a histogram of the garnet crystal size distribution.
Allie Nagurney (she/her): which shows for each radius the number of garnet crystals in the population with that size and looking at this crystal size distribution.
Allie Nagurney (she/her): We can see that in this sample there are a lot of small garnet crystals which is commonly interpreted as garnet new creation sort of over a short into for interval and then subsequent subsequent growth.
Allie Nagurney (she/her): The next thing we wanted to look out was the 3D spatial distribution of garden, because that can help us interpret the mechanisms that control garnet crystallization as well as the rate limiting step of garnet crystallization.
Allie Nagurney (she/her): And there's kind of two and Member scenarios that are common here, the first being an interface control, whereby the crystallization of God it is controlled by the attachment of atoms onto the surface of the garden crystal.
Allie Nagurney (she/her): And that results in a random 3D distribution of garnet crystals The other option is diffusion control where the.
Allie Nagurney (she/her): growth rate of garnet is controlled by the inner granular diffusion of elements such as aluminum through the intracranial matrix.
Allie Nagurney (she/her): And that will result in a non random distribution of garnet crystals in the sample because sort of there'll be growth suppression due to competition of nutrients between local ice crystals.
Allie Nagurney (she/her): So, in order to test with these two and Member scenarios we compare our 3D size, location of Granite crystals are sample to that of a random distribution to test to see if they are different from each other.
Allie Nagurney (she/her): So in these two pots, I have shown on the right, the top plot is a statistical test for nuclear depression, where the bottom is a test of growth suppression.
Allie Nagurney (she/her): In both cases, the pink window represents the interface controlled window or a random distribution.
Allie Nagurney (she/her): And these results show that, for both new creation and growth suppression, up to the mean nearest neighbor distance between Granite crystals.
Allie Nagurney (she/her): Are data which is shown by the black line plots outside the interface control window, so therefore, this can be interpreted as.
Allie Nagurney (she/her): The fact that guy is likely growing through a diffusion control and that the diffusion of transport of aluminum through the integrated you'll matrix likely controls the likely controls the growth of garnet and the sample.
Allie Nagurney (she/her): So i've just kind of done a deep dive into the crystallization kinetics of one sample and now I want to zoom out a little bit and talk about some various aspects of other samples collected around this barrington passage futon.
Allie Nagurney (she/her): So there are a couple kind of interesting field and.
Allie Nagurney (she/her): textual relationships, I want to show the first is that commonly in this area, you see these really large and Lucy for fear of loss in samples.
Allie Nagurney (she/her): Where they're shown here in the pink and they're pretty dominant Lee randomly oriented, and they appear to kind of be the last metamorphic mineral to grow and use rock so that's just to us it, this is kind of a later into Lucy.
Allie Nagurney (she/her): On the next important thing to note is that in the andalou side crystals there are garnet crystals and those garnet crystals have on h2o bearing fluid inclusions in them which again suggest to us that there was a.
Allie Nagurney (she/her): h2o bearing fluid that was present during the crystallization of some of these rocks.
Allie Nagurney (she/her): And finally, looking at on what some of these rocks and thin section, we can see one of the larger andalou say crystals in the bottom right here.
Allie Nagurney (she/her): And in looking at this rock It appears that this might record on two different fully Asians were in a garnet crystal there is a one full creation that's defined by on the alignment of courts.
Allie Nagurney (she/her): And then outside both the garnet and and lucite we see a second affiliation defined by Moscow.
Allie Nagurney (she/her): And we're still kind of trying to interpret what this may mean it could be interpreted as to metamorphic events, maybe multiple stages of defamation on we're still working on that, but that is an observation we've noted.
Allie Nagurney (she/her): So the final thing we did on the entire suite of samples from this area was do a various thorough Gramma tree on it, including on titanium and biotech thermometer three garnet biotech thermometer three, as well as garner garnet alumina silicate project plays around the tree.
Allie Nagurney (she/her): So to to kind of wrap up my conclusions on this barrington passage area, it appears at the peak PT conditions of these rocks are roughly 630 degrees C and four kilo bars, but there is a slight range over this area.
Allie Nagurney (she/her): Based on this one sample of the light feces kind of far away from the futon as well as maybe the multiple affiliations in those other rocks.
Allie Nagurney (she/her): We say that it is likely that these rocks were already at uncivilized feces prior to the intrusion of the futon and that andalou say growth may have been driven by heat from the futon as well as the Wu Tang likely released water rich fluids into the surrounding rocks.
Allie Nagurney (she/her): So now, I want to expand a little bit on just the work i've done on the barrington passage futon and compare it a little bit to the shelter and futon, which is another futon in the Southwestern reviewing the train.
Allie Nagurney (she/her): And there are a couple distinct differences in both the mineralogy and geochemistry of the protons but I, what I want to focus on is more the.
Allie Nagurney (she/her): metamorphic rocks around them, and one of the big differences is the kind of distribution of later stage, Professor blast in these two areas.
Allie Nagurney (she/her): Where on the left, we see as i've mentioned before we get this later and lucite in the parent and passage area where in the area around the shelburne futon you see you later stage quarter right.
Allie Nagurney (she/her): And this is a map that was that day pass and published back in 1999 of the distribution of late courtier eight in the shelburne area shown by these black circles and then i've just added in some of the distribution of the late and lucite in the barrington passage area.
Allie Nagurney (she/her): So that kind of leads to this question of what controls the distribution of late stage quarter right versus andalou site in this area.
Allie Nagurney (she/her): And in the interest of time i'll kind of skip to our conclusions, which we believe that the that this is likely controlled by the peak PT conditions of the Rock.
Allie Nagurney (she/her): Where this image on the right now shows the lower pressure face you series on looking at different mineral assemblages at varying pressures and temperatures.
Allie Nagurney (she/her): And what we can see is that the lower red box shows the distribution of AC series with quarter right and the upper shows that with andalou say i'm suggesting that you know that these rocks may have been.
Allie Nagurney (she/her): Under slightly different faces serious conditions which quantity quantitatively results in a pressure difference, about one to one and a half kilo bars.
Allie Nagurney (she/her): So when we compare that then to the.
Allie Nagurney (she/her): To quantitative pressure temperature constraints, where i've placed.
Allie Nagurney (she/her): On this map just shows different pressure temperature constraints were over here, I have some of my work from the barrington passage area, as well as a whole host of previous work.
Allie Nagurney (she/her): A lot of different thesis works from arcadia university over the years, and what we can see is that it does appear, there is a slight difference in peak pressure and temperature conditions.
Allie Nagurney (she/her): From the shelburne area to the barrington passage area where the barrington passage area may have been buried a little bit deeper than the shelburne area and it's been differentially exude.
Allie Nagurney (she/her): So now i've just added in a few more constraints from across the ooma terrain and, once again, there appears to kind of be a general trend moving from the Northeast in this map down to the southwest of slightly increasing pressure temperature conditions from the North East to the southwest.
Allie Nagurney (she/her): And another thing I just want to highlight is some previous Oregon Oregon GEO chronology that highlights that the Southwestern part of the machinima train cool through 300 degrees see about 10 to 15 million years later than the northeastern part.
Allie Nagurney (she/her): So we put that all together it's kind of a question of what does that mean that could be interpreted as because the Southwestern part was maybe hotter do the intrusion of pollutants that it stayed hotter for longer.
Allie Nagurney (she/her): Alternatively, we think that this actually the Madonna train may represent sort of a.
Allie Nagurney (she/her): That the Southwestern problem of getting a train yes i'm 400 to 350 million years ago may have been buried deeper than the northeastern part, which is why we get that increasing metamorphic.
Allie Nagurney (she/her): On pressure temperature conditions and metamorphic feces moving to the southwest and then it's been differentially zoomed the area to the level that we see it today.
Allie Nagurney (she/her): and quantitatively this there, though, about one to two kilowatt hour difference we see between the Northeast and the southwest.
Allie Nagurney (she/her): would result in about half to one kilometer difference in burial depth, which you know kind of just shown on this cartoon here of a cross section through the crust on.
Allie Nagurney (she/her): During the formation of the moon betrayed that kind of you know, might something look like this and then since then it has been differentially eroded or different generally assume to where we see it today.
Allie Nagurney (she/her): So in conclusion on regional metamorphic may have reached mid info black faces in the Southwestern magoo much rain, but only green shirts faces in the northeast.
Allie Nagurney (she/her): and increasing metamorphic grade to the southwest could be the result of a train being a greater depths than the Northeast and finally late stage, for fear of loss distribution may have been driven by the intrusion of the times, thank you.
faouziya haissen: Thank you an example, so please if there is any question or.
DAN MURRAY: You have a question concerning the contact metamorphosis and begin to sense of the third dimensional geometry of the protons with respect to the country rock.
DAN MURRAY: In other words, because the contact be shallow and passing under the country rock which case you would expect contact metamorphosis over a larger area.
Allie Nagurney (she/her): yeah um yeah i've thought about that a lot I think we're kind of in the unfortunate field area where.
Allie Nagurney (she/her): we're on the beach, and at the ocean, you know and there's not much, we can see past that but I think it is possible right that there could be you know.
Allie Nagurney (she/her): More of the proton underneath which could also be kind of skewing our view of what we're seeing I don't really know how to necessarily account for that, but that's definitely possible.
Okay.
faouziya haissen: Any other questions.
wintsch: i'm surprised you didn't do you think it's possible that the difference between into the site and Courtney weight bearing assemblages has something to do with the.
wintsch: iron magnesium versus aluminum composition.
Allie Nagurney (she/her): um.
Allie Nagurney (she/her): i've thought about that, but looking at the distribution of andalou site for his quarter and these rocks.
Allie Nagurney (she/her): They both like the late stage, for fear of loss distribution across cuts multiple different formations and it doesn't appear, you know that there's any sort of little logic control on what we see so i'm not entirely sure if it would be that.
faouziya haissen: Okay, thank you Alex i'm very we move to the.
faouziya haissen: Next.
faouziya haissen: Talk about the update on the second vehicle around you meet Joe chronology from rutgers week and early rocks of the pain of Scott baker Elia me who will be a given by my dad left Russia, we have a we have a pre recorded.
faouziya haissen: Video so please can you share your video.
Douglas Reusch: i'm event said that you could.
Douglas Reusch: started playing.
faouziya haissen: Okay, can you can you share the video, please.
Yvette D Kuiper: Thank you morning from farmington maine.
Yvette D Kuiper: My co authors justin spouse and Torrey Smith or significant help with the GL chronology and field logistics.
Yvette D Kuiper: About two to three new titles are coming from the pups cut back in live on the coast of maine USA perhaps Kobe is located near the southeastern margin of candy area, the leading Perry gondwana terrain and created to the appalachian origin.
Yvette D Kuiper: Political local rock span and apartment time interval from the late protozoa through early paleozoic the subtitle for an elite person version of this talk reads Paleo geography of earth's Southern Hemisphere during its biological renaissance.
Yvette D Kuiper: This interval is ripe, with significant biological events, the snowball glaciations assembly of two separate continents and life cycles of at least two major ocean basins.
Yvette D Kuiper: zooming in maine is located located west of the Nova Scotia Goma and north of the avalon of southeastern message of southeast New England.
Yvette D Kuiper: pepper it off obtain a car sample from.
Yvette D Kuiper: Georges bank.
Yvette D Kuiper: containing know zircons younger than 1.8 billion years and compared their cell phone with the tech dude courtside in the anti federalists.
Yvette D Kuiper: john slack clicked and i'll 14 six also with no zircons younger than 1.8 and we independently comparing our sample with the same courtside.
Yvette D Kuiper: Whereas Georges bank is viewed as a fragment of West Africa.
Yvette D Kuiper: stranded on our side of the Atlantic is likely, the main rocks had a far more complicated journey.
Yvette D Kuiper: The photograph is from North haven island in the middle of penobscot Bay with Hello lab is on the ellsworth terrain in the foreground in the background and the cabin hills made them resistant content will margin court sites.
Yvette D Kuiper: How these sharply contrasting assemblages became juxtaposed remains a first order question.
Yvette D Kuiper: The pre salary and perhaps cut bacon liar lies between the Frederick and troughs and the coastal Arc to the Northwest the boundary is the Center back pond fault, to the southeast the constant Arc is built on a regional scale angular nonconformity.
Yvette D Kuiper: The entire comprises to continental elements, the St Croix and Isles bro belts in the West and the oceanic ellsworth terrain in the East.
Yvette D Kuiper: On the right i've taken approximate thicknesses from maps and cross sections, the ellsworth includes kilometers of volcanic rocks whereas defined a strata graphic units in the St Croix belt are generally quite finished.
Yvette D Kuiper: let's take a quick look at oceanic elements in the ellsworth.
Yvette D Kuiper: kind of love is on the upper left.
Yvette D Kuiper: In the lower left the serpent tonight, oh dear i'll interpreted as mantle exhibited by hyper extension.
Yvette D Kuiper: And on the right bms deposits, such as the copper zinc mine near casting.
Yvette D Kuiper: shots in 2008.
Yvette D Kuiper: envisioned.
Yvette D Kuiper: It gulf of California type rift setting and then start until 2012 suggested the Columbia segment of Amazonia as the point of departure for nerium.
Yvette D Kuiper: On the right the vertical scale is now time for 10 to 720 million years ago and we'll have a look at three samples shown by the Green yellow and red arrows I will continue to use this correlation graphic to place the details and context, as I present the new results and discuss them.
Yvette D Kuiper: web 15 is from the ingraham grits near the top of the better hill formation in the better health sequence.
Yvette D Kuiper: These rocks occurred in the football the clam co thrust, which places produce results over or division.
Yvette D Kuiper: The cross section is by Adam Schumacher from Henry berries any gc 2000 field guide.
Yvette D Kuiper: That easy agent is show a prominent spike at 480 ma and a relatively small number of ages in the range one to two GA.
Yvette D Kuiper: The next sample 24 was collected from the north end of the cell island located opposite lime island both islands lie South Wales borough and approximately six kilometers on strike from the type locality of the 700 acre island formation.
Yvette D Kuiper: Thanks to Mr whitaker and john slack we have copies and pastes stewart's original field notes and maps.
Yvette D Kuiper: The upper photo is from Lima island named before it's beautiful marble deposits Hello photo shows the sample size in high grade metamorphic rocks at the north end of lascelles island.
Yvette D Kuiper: Storing attributed the aircraft pattern of the high grade rocks to horse strung out approximately along the access of the aisles borough archipelago.
Yvette D Kuiper: The new data show the prominent peek at 2 billion and a swath of younger ages, including and prominent peek at 6:15pm at.
Yvette D Kuiper: The third sample is from near the base of the beauchamp point formation of the recently defined rockport group.
Yvette D Kuiper: In particular, from a narrow zone and broken sandstone fragments in a political matrix.
Yvette D Kuiper: In the corner of the cove is an outcrop of slightly rusty ortho court site mythologically similar to the rockport harbor rockport higher up in the section.
Yvette D Kuiper: i'm going to be about here.
Yvette D Kuiper: The dead man point marble shown as a thin light blue stripe can be traced inland North and North Western.
Yvette D Kuiper: Eastern the OSHA point formation is considered to underlie the beauchamp point formation.
Yvette D Kuiper: The pattern and up.
Yvette D Kuiper: To where we sample is nearly identical to.
Yvette D Kuiper: Broken formation at certain points, a few kilometers to the north.
Yvette D Kuiper: and turning point discrete lenses of marble and volcanic rocks current the base of the penobscot information pattern found in multiple locations in the region.
Yvette D Kuiper: The disease spectrum for this sample shows a prominent peak at 2.1 GA small peak about around 1.8 and a few archean brains.
Yvette D Kuiper: Some additional geological context on the cross section from iceberg and Barry.
Yvette D Kuiper: A sample again is from the base of the Bush and point foundation and two photographs from 350 meters to the east and the ozer point formation, where they are.
Yvette D Kuiper: displays clear graded beds and open falls with a prominent accidental planar cleavage.
Yvette D Kuiper: Just an observer blue courts in a nearby granular conglomerate then.
Yvette D Kuiper: So this is where I transition from results to discussion before redoing our stack of the titles or con spectra, I would like to speculate on the contacts at the base of the bookshop point here, and at the base of the penobscot information that turning point.
Yvette D Kuiper: In general, at quite reasonable argument has been made for the we're going to cook penobscot contact to be comfortable.
Yvette D Kuiper: So my rack sequence has been observed at multiple locations.
Yvette D Kuiper: At tanglewood camp around 10 kilometers to the north of Sherman point Tucker at our.
Yvette D Kuiper: 22,001.
Yvette D Kuiper: Report it a 503 names from volcanic rocks at the base of the penobscot.
Yvette D Kuiper: Our samples w PV four and five indicate a maximum deposition age of 470 approximately 30 million years younger.
Yvette D Kuiper: he's data, as was pointed out by Henry Barry at any GSA and portland are difficult to reconcile with a comfortable contact.
Yvette D Kuiper: We have a sample from the earlier point formation, but as yet no analyses a burning question in my mind is if the dead man point marvel delineates and embrace zone at the base of the potion point.
Yvette D Kuiper: Then could those your point in the wall of a thrust be the youngest unit, not the oldest.
Yvette D Kuiper: mythologically it resembles the ingraham grits which also occur in an easterly outcrop both through rockland.
Yvette D Kuiper: Along the Center back confab Dave West pointed out that one part of the gym complex is GEO chronologically identical to the ingraham grits and it contains blue courts.
Yvette D Kuiper: This speculative scenario.
Yvette D Kuiper: suggests slices of precambrian cambrian basement thrust into an organization's mission basin.
Yvette D Kuiper: here's the stack of our DC results and i'll review them, beginning with the oldest rocks.
Yvette D Kuiper: The all the samples are consistent with deposition on the margin of the West African crates on.
Yvette D Kuiper: The msl island samples shows and prominent peek at six fema, which is the age of the magnetite reported by Stuart at all 2001, which includes the 700 acre island formation.
Yvette D Kuiper: On their recent plate reconstruction murder at all 2021 show again area colliding with the West African Great time at this time 650.
Yvette D Kuiper: And the cookson group uncomfortable vote on the record group quite sites on the simonton corners and body formations show, at least two additional populations.
Yvette D Kuiper: One with a large percentage of grains between one and 1.3 GPA and a narrower peak getting an excellent deposition of age of 565 ma.
Yvette D Kuiper: During the link protozoa and one scenario can do with a strip of whack margin was sliding West towards Colombian take off point from Amazonia in a generally transgressive regime within the overall context of assembly code one.
Yvette D Kuiper: Two samples from the base of the turtle code formation.
Yvette D Kuiper: turtle had co formation.
Yvette D Kuiper: With mda 5:10am a display a classic again durian signature, for example, as documented as Far West, as in the motown terrain and from on.
Yvette D Kuiper: These rocks are less mature than and the cookson on the mainland.
Yvette D Kuiper: They find upwards from a baseball unconformity.
Yvette D Kuiper: And they make her like with my model volcanic rocks and the ellsworth and trivial interesting as can dear departed from God wanna.
Yvette D Kuiper: wp seven for most point is lacking the middle Cameroonian ages settlements illogically it is relatively mature and, along with the kindle mountain formation of Eastern maine has been tentatively considered passive margin of a paragon one and backyard pacing.
Yvette D Kuiper: The setting of the risk deposits would explain the lack of rift age zircons.
Yvette D Kuiper: samples from Shannon point w PV four and five maximum deposition all ages and for 70 ma and are solidly automation.
Yvette D Kuiper: neck formation containing paradox bracket pods as they start at 540 ma the age of the golden grove Platonic suite of the brookville terrain new brunswick.
Yvette D Kuiper: Finally, the 40 am a spike in the ingraham grits points to the uplift an explanation of penobscot are crocs widely distributed to the Northwest and then cushy an adele belton new brunswick.
Yvette D Kuiper: For online basin seems plausible sending otherwise no existing model can explain the complete array of sediment illogical structural and do chronological data.
Yvette D Kuiper: points.
Yvette D Kuiper: A slug of ma zircons in the ingraham grits implies uplift and erosion of late cambrian early automation arca rocks such as President and the cushy volcanic.
Yvette D Kuiper: that's not slug of 650 ma zircons in the sample from the cell islands corresponds with an Arc abduction onto the margin of the West African krypton which set the stage for a slice of whack margin to ultimately arrive in maine.
Yvette D Kuiper: Third point eight 1.8 1.8 GPA mda for the sample from the base of the beauchamp point formation.
Yvette D Kuiper: connects the rock part group of the mainland with previously correlated rocks on ios berto, it is also consistent with a potential cheers own.
Yvette D Kuiper: Rather than comfortable contact down into the ocean point formation, the latter is conceivably a gun united equivalent to the ingraham grits the young portion of the chat broke complex and possibly a marching band member of the ellsworth chest, to the east of penobscot bay.
Yvette D Kuiper: There are at least two dozen moving pieces of the puzzle has not yet completed Thank you and I would like to acknowledge very helpful email discussions with Roger block and in the field with Henry very Thank you again.
faouziya haissen: Thank you so much, we have five minutes for versus long to ask.
faouziya haissen: Any question.
John Waldron: Here I could ask one.
John Waldron: Hello Doug great talk that's fantastic.
John Waldron: The as I read the existing literature, the the date from the penobscot formation of a lava was previously, the only constraint on the age of the.
John Waldron: Underlying mechanical succession, but if you're saying that is potentially a thrust that constraint is then remove Am I correct in reading that.
Douglas Reusch: um, I guess, yes, although the data from the body and assignment and corners are consistent with the traditional Cameron age for the mechanical.
John Waldron: But it could go younger they cause many of those plastic can darian successions go higher in the cambrian than that age and that's always been a difference, again, as I read it between that mcginty coke succession and other gandy arian quotes those continent for margin successions.
Douglas Reusch: So I guess that's a possibility, and if so it'd be nice to have all over young instead of the other way around.
John Waldron: yeah.
John Waldron: Thank you.
faouziya haissen: Okay, any other question we have two minutes.
faouziya haissen: So if we don't have more question we are having a break 10 minutes break and after the break say kasim and the further we will be presenting the talks and the poster so let's meet after 10 minutes okay.
Sa?d Belkacim: Yes.
Sa?d Belkacim: Thank you.
Yvette D Kuiper: sounds good.
faouziya haissen: yeah you can hang out here for people wanting.
Yvette D Kuiper: very nice data Center only have any questions but.
Yvette D Kuiper: very nice datasets.
Douglas Reusch: justin's been quite busy with his new boy who was born in early January so that's why it's not here.
Yvette D Kuiper: Everything is well.
Douglas Reusch: Yes, everything as well.
Douglas Reusch: Roger did you want to say anything about your ideas.
Roger Bloch: hey hey Doug.
Roger Bloch: Well, just that.
Roger Bloch: yeah your your data seems to be quite consistent, as you pointed out, with the the general.
Roger Bloch: setup there's shown by murderous latest plate reconstruction.
Roger Bloch: And that you could satisfy both the West African provenance indications and the sense that Ganda area was probably down closer to Colombia by colliding and sliding it with just a little little.
Roger Bloch: update of motifs work, taking into account the work of the folks on West Africa with the strike slip scenario they they use in the late neoproterozoic.
Roger Bloch: So it's all seems to fit fairly well with some frameworks going on around your work it's it's pretty exciting.
Douglas Reusch: I like the idea that the pegboard tight on spruce island might be connected to an Arc abduction event on to the West African CRATE on.
Roger Bloch: yep yeah a lot, a lot of, as you say, a lot of moving parts, but they.
Roger Bloch: still some hanging bits, but it seems like it's starting to fit together well with with the other moving parts around you.
Roger Bloch: As a pretty much unrelated thing but have years talk, I found was just fascinating with the.
Roger Bloch: Point that really as a start trigger for I gotta admit had eluded me that you can have different ages have on lap for the marine strategy post breakup unconformity but if the underlying ages are all consistently a certain age and older it died dire the acronym of of post breakup deposition.
Roger Bloch: doesn't mean that the breakup was diaphanous I found that work really enlightening.
Javier Alvaro: Yes, i'm here.
Javier Alvaro: Okay, maybe we are using the same war will different meanings because what I tried to say is that the beginning of segmentation is the acronyms.
Javier Alvaro: So these are common God they're Ocean is going to incite differ information, so the base of the gut is the icons, but this is due to erosion.
Javier Alvaro: But to begin our segmentation so intuitive related no money to the beginning of opening up Romans so gremlins will develop in different places at different ages, so this is the beginning of segmentation, which is also that occur.
Javier Alvaro: So maybe we are using the same words related to different information in my case, I tried to highlight the fact that the beginning of segmentation post unconformity history documents, because he's also clinically related.
Javier Alvaro: And I just blend that normally this is related to the the art brief and Ruth to transition the normally in our mind with us on this typical Ottawa extension and movement quality say supplements honest opinion and I suppose we know what look i've tried to see that the only situation.
Javier Alvaro: Or maybe do some additional in this related to their opening so I was using backers to the final to describe the anal scene invitation and the beginning of segmentation you got different ages.
Roger Bloch: yeah we may be saying the same thing with different terms, but I was asking those questions, to make sure I was getting the correct conclusion.
Roger Bloch: And let me see if I can pin it down.
Roger Bloch: Are you saying that the that there was in fact a zipper like opening to the react or that your data would be consistent with a simultaneous opening to the rick.
Javier Alvaro: For me, is to do the enough or the visa process matching condition is ready to drink until the cell friends.
Javier Alvaro: You go to the East to Sardinia and the Alps they're half an hour program their priorities they open in other cities, but the segment has been discussing today, it was only for the break open India hmm.
Thank you.
Yvette D Kuiper: How are you.
MDThomefolder: i'm doing okay.
MDThomefolder: Not.
MDThomefolder: pretty much life isn't so much different here than it was before, because I haven't been having any teaching responsibilities for so long.
MDThomefolder: But.
it's.
MDThomefolder: i'm ready to move on to some other things besides sitting at this desk.
Yvette D Kuiper: Life is different for everybody, as he.
Yvette D Kuiper: looks like this year.
Yvette D Kuiper: Oh, my gosh.
Yvette D Kuiper: My clothes.
Yvette D Kuiper: Which is good, I quit my students get the one day off I wish already know each other.
MDThomefolder: So it's your campus open for some classes are you doing everything online.
Yvette D Kuiper: But we're doing a mix and i'm actually only teaching face to face with Nice and.
Yvette D Kuiper: they'll there's only so many people, you can have in the classroom and come ask them and.
Yvette D Kuiper: The masculine is a little bit of both suffocating.
MDThomefolder: I would think so.
Yvette D Kuiper: it's it's a better deal than online.
Yvette D Kuiper: yeah so far So hopefully we'll have simply in the session as.
MDThomefolder: Well, so we had to cook to they brought this first year and sophomores in for the fall term and some of their classes were face to face on campus but.
MDThomefolder: Anybody like me who doesn't teach is banned from campus and the same at MIT so it's you know all of my other workspaces have been closed off for.
MDThomefolder: way too long.
Yvette D Kuiper: Oh, so you can go do lover there's no way to get permission to do.
MDThomefolder: I have gotten a lot of writing done, however.
Yvette D Kuiper: They told me that they have a lot of papers being submitted.
Yvette D Kuiper: Reviewing do we have.
Yvette D Kuiper: yeah.
MDThomefolder: So you've been skiing.
Yvette D Kuiper: downhill skiing because really I wasn't sure if it was going to be saved or not and we're asking for next year, but i've been going North Nordic skiing course.
MDThomefolder: yeah.
Yvette D Kuiper: it's actually nice to do something different for a year.
MDThomefolder: Size to if you can just walk out your door and do it, and which is what we can do here we have a golf course right within a couple of blocks, so can ski right.
Yvette D Kuiper: Enough snow here but.
DAN MURRAY: Maybe you don't have any snow.
MDThomefolder: Well, we when we did have snow we actually still have a little bit in our driveway is the one last are.
MDThomefolder: Where are you Dan with the golden.
DAN MURRAY: I just can't wait to get back.
Bill Burton: We had a lot another lousy winner in northern Virginia, with a total of about five inches.
Bill Burton: ice and slushy get an interest slush and I also live on a golf course, so I managed to get out about six times on the golf course with almost no snow.
Bill Burton: So you could ski anywhere.
Yvette D Kuiper: you're skiing or your ski ski in you kind of deal.
Bill Burton: yeah right scary even that one degree grade.
Yvette D Kuiper: saucedo you're here.
Yes.
Yvette D Kuiper: Are you prepared, are you ready to.
Sa?d Belkacim: Yes, let's start now or maybe two minutes.
Sa?d Belkacim: After two minutes one minute.
Yvette D Kuiper: yeah something like that.
Yvette D Kuiper: Okay, just checking if you're ready to go.
Sa?d Belkacim: Okay, yes, good.
MDThomefolder: Nice to meet you.
Sa?d Belkacim: Thank you.
MDThomefolder: Just a little bit of an adventure connecting with all the folks whose names i've seen but haven't managed to to tie into yet.
Sa?d Belkacim: So.
Sa?d Belkacim: let's start, even so, my name is side because in from a good University in Morocco i'm a secretary of the agency project is recipe 683 project.
Sa?d Belkacim: i'm glad moderating a part of decision so it's my pleasure to welcome our next speaker Professor Thompson matter from wellesley college for for her talk.
Sa?d Belkacim: African affinity of Tony and digital 01 in our Rania of South Eastern most New England USA so whenever we already, the floor is yours prophecy.
MDThomefolder: Okay, there we go.
MDThomefolder: share.
MDThomefolder: clay slide play from star.
MDThomefolder: Everybody see that.
MDThomefolder: Yes, all right well.
MDThomefolder: My my purpose today is to discuss the provenance implications of Tony and hd titles work on that event and their students have recently recognized in these and other rocks.
MDThomefolder: near Newport Rhode island and this sequence amounts to some 500 meters of Meta sedimentary rocks with some inner bedded tough sun pyroclastic units and all of this was how do I advance the slide.
MDThomefolder: All of this sits at the extreme southeastern and of the belt of West apollonian trains it stretches all the way from southeastern New England up through new brunswick and Nova Scotia to eastern new Finland and.
MDThomefolder: They have suggested that these Tony and age, the tribal zircons originate from sources in West Africa.
MDThomefolder: mainly because there are no Tony and age, a bedrock units in southeastern New England, but i'm i'm going to start this morning with a bit of a tour of southeastern New England as a lead into relationships with that, especially the Kaaba quit Highlands up in Nova Scotia.
MDThomefolder: which I think provide or other possible sources for Tony and hd trials are cons so.
MDThomefolder: Most of southeastern New England is underlined by ED akron Arc related gratitude rocks these start with the 620 million year proto list of the rope very nice, which is over in this corner.
MDThomefolder: extends all the way up to a 589 courts diarize closer to Boston the datum sweet starting at 610 and a little younger which surrounds the Boston based on his overlain unconfirmed bubbly by.
MDThomefolder: rocks of the Lynn matter pan volcanic complex with days between 597 and 593 and within the base and itself the roxbury conglomerate over lies the matter pant the limb at a pan and as intruded by calc alkaline sills with dates at 585 and 584.
MDThomefolder: I also want to point out in the world units, these are pre ED akron Meta sedimentary rocks, including the westboro formation north of Boston plainfield formation, mostly in Connecticut and the blackstone group over here in Rhode island.
MDThomefolder: It is all of these appear on the 2006 with a tectonic map of Jim hubbard and others as.
MDThomefolder: paragon one and basements and it's the westboro formation in particular that that provides the first link, I want to explore with Nova Scotia.
MDThomefolder: So here now our details from hubert's with a tectonic map the basement occurrences are in purple, and this is the westboro formation north of Boston constrained by a.
MDThomefolder: TIM stayed for a maximum age of 912 million years and this little strip down and the consequence includes the gamble brooke formation.
MDThomefolder: Now known to be younger than 945 million years, this is one of many soon to be published States by Chris white and Sandra bar.
MDThomefolder: These two units are have long been known for their similar detritus zero con assemblages which includes significant grand villian age, Sir Khan, and what I put along the bottom here or black dots showing available tim's constraints threw out that that.
MDThomefolder: The the spectrum in each case, which are both of them go back into the archaean.
MDThomefolder: We can also look at the live oh strata graphic columns to see that there's quite similar magnetic history in between southeastern New England.
MDThomefolder: And the Kaaba quiz this starts at about 620 million years which we already knew, but now, with the new laser ablation data that range extends all the way up into the time equivalent to Lynn matter pan volcanism and.
MDThomefolder: If I switch now this this is.
MDThomefolder: Christian sandra's map of the Kaaba quit Highlands in which they are now recognizing three fault blocks that jeffers block the bass river block the mouth F from block.
MDThomefolder: And the the over here on the right, I hope this isn't covered by zoom faces on your screen, but over here is a summary of all of the laser ablation data.
MDThomefolder: From their study that was produced by Jim Crowley and the most important thing to point out, now is the recognition of Tony and age protons in the Mt F from blog, and these have.
MDThomefolder: dates that overlap with the to probability maximum from samples down around Newport those those maximum or five or sorry six six we'd all just put it on 745 and 733 million years and i've had that interval.
MDThomefolder: In in this slide and I will refer to that interval is the older Newport maximum going forward.
MDThomefolder: Those two samples also heal the probability takes at 650 and 643 million years I didn't have room to label it, but this will be the younger.
MDThomefolder: Newport maximum on that overlaps with inherited components up in the jeffers blah.
MDThomefolder: So what i'm going to do in the next slide is use these two shaded intervals is kind of a reference point to look at actual dates from the Kaaba quid study so here now.
MDThomefolder: The older Newport maximum is horizontal and i've added a 10 million year on blow up on either side to kind of schematically recognize the fact that.
MDThomefolder: Zero con of variable ages contributes to the probability maximum and also that the laser ablation basin any of those cases have uncertainties.
MDThomefolder: Well over 10 million years, so in this diagram i'm showing you crystallization ages from futons and some volcanic rocks in the Mount Everest block and these dates range from set of this, I think, is 754 to 727 some of them fall squarely within that maximum and all the rest.
MDThomefolder: Are within the envelope within their uncertainties over here our inheritance.
MDThomefolder: recognized in ED akron age protons and volcanic rocks again the older Newport maximum these are days from singles or cons.
MDThomefolder: In the in the dates i've mentioned, and you can see that some overlap, the maximum but all overlap of the larger on envelope and, on this side are actually populations of inheriting zircons which which fall within the possible range of the younger Newport maximum.
MDThomefolder: So i'm going to use the same approach now coming back to Boston to show you.
MDThomefolder: A sample detritus zircons spectra and sedimentary rocks of the Boston base and I have three sand stones from the roxbury conglomerate this Franklin park sample is down here on the.
MDThomefolder: South side of the basin and also very near the base of the roxbury section, which is something more than 1000 meters thick the sample it's quantum.
MDThomefolder: pokes out here and to Boston harbor and lives near the top of the section and the new Newton sample is is somewhere in between.
MDThomefolder: I also have results from a sample of the Cambridge art Cambridge formation, which overlords lives, the roxbury conglomerate in the base and and that sample comes from a tunnel down in Weymouth Massachusetts.
MDThomefolder: All of the cheer chronology that i'm going to show you is also done by Jim Crowley who did the cob acquitted work.
MDThomefolder: And, but we used a two phase approach first laser ablation to identify the full range of Detroit all ages and then TIM stating to.
MDThomefolder: Read date some of the youngest grains that we identified and laser ablation so the TIM States obviously give us much more precise constraints on things like maximum ages and provenance.
MDThomefolder: possibilities and as you'll see, they also prize provides some pretty interesting reality checks on the laser ablation data.
MDThomefolder: So, starting at the bottom, this is the Franklin park sample gave a probability peek at 611 we read eight to 10 grains related to that peak.
MDThomefolder: To get a maximum age of 595 and the oldest of those 10 grants goes back to 618 so all those constraints agree with ages of the the art complex I showed you.
MDThomefolder: In southeastern New England, the other important thing here is that 69% of the laser ablation dates were actually pre ED akron and I put here again that span of westboro Detroit all ages to argue that all of these pre dx and grains are simply a recycled out of the westboro formation.
MDThomefolder: up here and Newton we had 90% of the laser ablation dates contributing to a peek at 594 the five of the six grains we read aged give waited mean 599.
MDThomefolder: which would be the maximum positional age.
MDThomefolder: And even though they're only a handful of pre ED akron zircons we can still recognize the westboro signal for all of those and now up here it's quantum.
MDThomefolder: peek at 583 maximum age at 596 and this, by the way, from the very same grain that yielded a laser ablation data 559 million years and again the smattering of westboro.
MDThomefolder: recycled grains, but I want you to look closely here, and these two, we can see that they're actually pre ED acklin grains that are not that are outside the westboro range.
MDThomefolder: And just highlighting those each of these PICs from ones are con here's a 687 at at Franklin par 733 and Newton and from the tunnel sample we got a peek at 756 million years so.
MDThomefolder: ages like this suggests to me that we We might well ask whether the the trial suites in the Boston area might contain some recycled components from the new port sequence.
MDThomefolder: And i'm going to show you that argument and a little more detail, and this next slide so.
MDThomefolder: Here now at the bottom is the older Newport maximum, these are the laser ablation dates from those three zircons that gave rise to the little peaks I won't.
MDThomefolder: Read the numbers, but all of them overlap, the maximum and it's envelope.
MDThomefolder: And up here is the younger Newport maximum which is overlap within error by numerous grains from all three of the roxbury stands stones, and these are from the tunnels sample so assuming, for the sake of argument that these are recycled from the new port formation.
MDThomefolder: This is an interpretation or the the implications are, first, that the Newport area was part of southeastern New England at the time of roxbury deposition which started around 595.
MDThomefolder: And one one okay.
MDThomefolder: Then I should cut to the cut to the chase so basically what I see is the new port sequence fits into.
MDThomefolder: The.
MDThomefolder: The cob liquid framework, it has to be younger than about 650 and all younger than about 650 based on the younger maximum has to be older than the akron cons with the inheritance that's like the new port.
MDThomefolder: younger maximum and we also it lies in a position below stratified units in the jeffers group and the George bill group that George filled group contains matt detritus that agrees with the new the older Newport maximum, and for this reason we.
MDThomefolder: We are following the model of case on stall and suggesting that the ED akron that the.
MDThomefolder: Tony and mount F from group and it's westboro basement developed along the margin of baltika.
MDThomefolder: Where we can match up the half name isotopic compositions in the George phil group with some offshore articulated rocks along the Baltic margin.
MDThomefolder: And by 600 million years in cases model we see the West, the akron Arc magnetism coming to an end in southeastern New England.
MDThomefolder: As and all the other West abalone and terrains as they migrate through a gap that's developed between baltika and the gondwana and margin and they're heading now into an Arc Arc collision.
MDThomefolder: at around 600 million years and I will just close up by saying that suggesting that subsequent.
MDThomefolder: Transfer emotions and.
MDThomefolder: transmit lateral movement so long that same boundary could explain why southeastern New England and the new port of sequence has been displaced from its original position along the.
MDThomefolder: The mainland Nova Scotia position, thank you.
Sa?d Belkacim: Thank you very much for your interesting talk, I think, for because of time restraints, we have just.
Sa?d Belkacim: Two minutes for questions.
Oh.
Sa?d Belkacim: yeah.
Sa?d Belkacim: Please.
MDThomefolder: Sorry, I the race at the end.
MDThomefolder: Please ask a question.
MDThomefolder: I.
Yvette D Kuiper: do have a question, if I may, and an actually.
Yvette D Kuiper: saved me means let like the end of the focus in like five minutes for questions left.
Okay.
Yvette D Kuiper: Well, as it seems so there's no no that's.
Okay.
Yvette D Kuiper: So what you're saying is one interpretation and that the newport's were actually they were derived from the Cobra could Highlands If that is true.
Yvette D Kuiper: How are you how do you know what a Cobra create islands come from like the part that has those Tony in.
Yvette D Kuiper: prisons.
MDThomefolder: Right, can I go back to my screen share.
Like not Tony and yes.
MDThomefolder: The reason is ropes I need to go this way.
MDThomefolder: Can i'm not going back what's the matter here.
MDThomefolder: There we go the main reason is because we've we look at the half name isotopic compositions and i'm focusing on those rocks in the George phil group.
MDThomefolder: And some of those that can yield the zircons with Newport maximum like ages those overlap with units from the developed off the margin of baltika and Tony and time.
MDThomefolder: So we're seeing a Baltic signal and the half name isotopic signatures and, additionally, we see the Baltic signal in the gamble brooke formation and the the older.
MDThomefolder: The older Paleo protozoa and our kinzer cons in the in the sweets from baltika so I mean this to obviously is an interpretation but i'm just for the sake of argument I don't think we can go straight to Africa to explain.
MDThomefolder: The range of data that we have available to us to examine this question.
Yvette D Kuiper: Then baltika doesn't really have any 740 billion year Pluto in the race.
MDThomefolder: It doesn't but the but the offshore arcs that were developed in Tony and time so we're our Tony an Arc from the from the Mount Everest group were suggesting would be something equivalent to these these these baltika units just farther along than March and.
Yvette D Kuiper: Thank you.
Sa?d Belkacim: Thank you, Margaret, so now we will hear from our next speaker.
Sa?d Belkacim: Burton William from Florence pass congestion Center for his talk titled new digital zero con data from Western connect to provide insights insight into turn affinities and map patterns of originally trilogies please, if you are, if you are ready to go.
Bill Burton: Have.
Bill Burton: A look all right.
Sa?d Belkacim: Thank you.
Okay.
Bill Burton: So i'm going to be talking about work we've done recently involving geologic mapping and two triangles are con studies and user my co authors.
Bill Burton: I particularly want to thank Bob winch for generously sharing some unpublished data without which many of these conclusions i'm going to talk about today would not be possible.
Bill Burton: And i'm trying to advance Why am I not okay so here's the hibbard lipo tectonic map and we're here's the outline of Connecticut and.
Bill Burton: New England and our area of study is that red triangle in western Connecticut and there are two main belts a rock coming down into that area, the green is period laurentian or division Arc system with the lower part of it courting them laurentian affinity.
Bill Burton: And then another another part that comes in here is the Slovenian Cyril devonian Connecticut valley GASP a trough, also known as the Connecticut valley Sinclair noria.
Bill Burton: And that's represented by highly deformed tight sin forums at snake their way through the other terrain, the green terrain here.
Bill Burton: And together comprise much of the the geology.
Bill Burton: Then we have in the core according to hibbard at all core or the waterbury Dome I happened in riff facie so we're going to examine these assignments, in the light of new mapping and Detroit or Conde.
Bill Burton: So our question here, posing is what is the location of the laurentian paragon one and boundary, also known as the red Indian line in western Connecticut.
Bill Burton: So a McDonald at all and carabiners at all have published maps, based on their own to try to work in Massachusetts in Vermont and assigning different areas to different terrains and in Connecticut so we have, for instance, the more town drain and light green.
Bill Burton: Their details are con data as we show indicate that's paragon one and then different that's differentiated from the laurentian margin which in western Connecticut is represented by.
Bill Burton: The row shifts and they did not sample in Connecticut so their assignment of this area to more town terrain, is based on a previous map correlations which we'll see in a second.
Bill Burton: So the red Indian line or the the boundary we're looking for would be between these two areas.
Bill Burton: So here's the area in western Connecticut we've been studying and the light Green is a.
Bill Burton: rattler mountain schist which Rogers on the State map you thought equivalent to the more town formation, which McDowell and Kabir Caribbean us and others assigned to paragon one.
Bill Burton: The darker Green is row formation, which Rogers that's where he mapped and then that's considered to be Perry laurentian see you see here the problem we have the red Indian line.
Bill Burton: If you just take the state map literally the red Indian line forms are pretty complex pad well as luck would have it, the usgs had has had a detailed seven and a half minute quadrangle mapping program in this area and we've done we're working on three quads side by side Walsh.
Bill Burton: Published new Milford in 2003 and bill Devon and i've been working in the Jason quads woodbury in roxbury we're just about done with.
Bill Burton: woodbury quad and also now working in the roxbury quad and we've done we sampled the trials are con from these localities and so what i'll be talking about.
Bill Burton: None in the roxbury quad because at the time of sampling we hadn't started mapping there yet, however, we have winch at all sample of the row coming in that comes into the quadrangle and we'll be using that today so mostly row and rattling in those areas.
Bill Burton: So here's the new Milford quad by Walsh.
Bill Burton: The red line is cameron's line, which is a tectonically significant.
Bill Burton: boundary but not the one we're looking at today and Steve jarrett will explain that in the next presentation.
Bill Burton: Here is we're looking at rural rattling boundary outlined and yellow here by Walsh and we sampled in the in the rat limb schist.
Bill Burton: Courts rich Granite fells and mica schist and we got from that this is the probability plot a very strong granville peak which shows that this rock mapped is rattling has a very strong laurentian signature.
Bill Burton: Moving to quads to the East to the woodbury quad up and then this is the area bill and I mapped and we're looking up in the Northwest corner first.
Bill Burton: Where we sampled two quarts rich horizons and the blue light blue here is rattler mountain schist so again, that was a.
Bill Burton: Thought equivalent to the more town formation and would be paragon one, and so we sampled these and the first one is a pretty pure medicine stone to courtside typically bedded.
Bill Burton: In a yield in an age very similar to the new Milford one are very strong granville excuse me and and I think we can assign that with a lot of confidence to.
Bill Burton: lorenza based on the Detroit or con now the other one I mapped it's only a couple kilometers to the south, so figured it was mapped within the rattlers these are both or Q.
Bill Burton: And we figured that would yield similar results so here's the rock from that's a little more it's well bedded a little more fine grained.
Bill Burton: With some Mike inner beds and Craig ditches looking at the outcrop here and that yield instead a spectrum that looks quite different and it.
Bill Burton: shows, and I unfortunately my screens blocked here, so let me get this all right, I can't it shows a prominent bronson hill peak at 450 a granville peek at around 1000 and then some paragon Guan and peaks around 600 and above 1500 so.
Bill Burton: This obviously is quite different in results than the the 640 peak.
Bill Burton: Sorry, the 641 sample so we have we have a problem there.
Bill Burton: Alright, so moving East there's another sample so here's the one we just discussed in this, this is another sample that was also you know this is rat the rat.
Bill Burton: assigned to the rat loom shift and 667 was also assigned a big part of their rattling shifts based on similarity of the courts rich sediments.
Bill Burton: So here's that rock Oh well, layered Meta sandstone and.
Bill Burton: It yielded similar results to the other one a strong bronson hill peak.
Bill Burton: A very strong neoproterozoic peak and a granville peak with a characteristic slope of florencia and some more paragon dwan so we assign this at bronson hill gone bwana and granville sources.
Bill Burton: So let's stop here and see what we've learned so far, so the first two samples we discussed had very strong granville peaks and we can confidently.
Bill Burton: assign them to laurentian affinity and showed from winch sample that they are equivalent to the roche's So those are all part of the same thing and they're all Perry laurentian.
Bill Burton: that's excluding the last two samples i've been talking about and here's Caribbean this is data, so we have winched down here at the bottom and.
Bill Burton: Good I got really thing, excuse me so which is this is the yellow star at the bottom that I showed you south of the roxbury quad so East flat hill road.
Bill Burton: And that's in the in the row, and we have these peaks and then here's Caribbean is at the top, all of these have Perry laurentian affinities.
Bill Burton: So now I switch this to more town, the rattler mountain and row shifts are not equivalent to the more town formation, which totally lacks a strong grenville peak.
Bill Burton: Therefore, the line we're looking for the writing in line must be East of the package of rocks that we are mapping as rattler mountain shift and rocio just in western Connecticut.
Bill Burton: So the intervening quad the roxbury quad that's still under construction supports the notion that the rattler Monroe there's not a significant boundary between them, but there we were finding that they're actually the contact is great.
Bill Burton: With a politik row grading into a predominantly Sam medic rattling shifts so that supports the notion that the red Indian line is nowhere near here.
Bill Burton: Now our last sample and discuss is down here in the southeast corner of the woodbury quad.
Bill Burton: And this is in a terrain that's different from the rattlers terrain, to the West these rocks are higher grade they're more intensely deformed and they're magnetic.
Bill Burton: And, whereas the rattling rocks have store like kind of bearing assemblages store alight disappears in this terrain so on the basis of that i've assigned.
Bill Burton: A thrust fault in here dipping north and west that separates this terrain from the terrain, to the West, and this is this is agrees with Greg teaches.
Bill Burton: A structural architecture on waterbury don't with outward dipping thrust fault, so this particular rock and rusty shift which we had a hard time finding a quartz rich horizon, but we did.
Bill Burton: And that gives an age that's another composite we have a strong granville peak with a slope, but also some gondwana and aspects peaks between 15 and 2000 and this 548 P, so this is another mixed assemblage so no bronson hill but granville and gone one.
Bill Burton: So let's look at compare this to other ones, so this is the one we just discussed.
Bill Burton: here's the probability plot and Nice compare favorably with winch and others data from elsewhere in western Connecticut we have collinsville nice up here and cobble mountain formation paragon one and and and perry laurentian sources both.
Bill Burton: Sorry, that one blinked out Okay, and it does not again compare to not equivalent to more town rock according to caribbean's trials are con.
Bill Burton: So let's summarize, where we are now so here a compilation by Bill Devlin showing laurentian.
Bill Burton: Do trials are cons in purple we have mixed sources, like the one we just discussed in grey and then paragon one and it seems to be confined to the core of domes the Bristol Dome and the granville Dome.
Bill Burton: Data by stamp and Caribbean us and winch and and then the straight shift that this is we haven't discussed this yet.
Bill Burton: Solar devonian rock so the paragon Guan and perhaps already in your line is confined to the course of of West Connecticut don't.
Bill Burton: Now i'm giving away those two enigmatic samples I talked about I have colored yellow here so let's.
Bill Burton: let's see why that is, but before I get to that, I think we need to sample two trials are cons and the core of the waterbury Dome next alright we're back to these two samples that yielded very mixed spectra and.
Bill Burton: Here they are well well both well bedded sand stones their patterns don't match more town.
Bill Burton: But they do match our samples from solar devonian straight shift and devonian goshen formation, so the bottom spectra from stamp and Caribbean enos.
Bill Burton: shows goshen and here's winch data showing straight shifts so that's the guests these rocks or not or division at all, but are distinctly younger and belong to the Connecticut valley Sinclair dorian.
Bill Burton: grew up in here's our samples at top.
Bill Burton: So they resemble and these these rocks the sand stones resemble Russell mountain formation, which we could call basal stripes.
Bill Burton: Well, this solves a problem i'd had mapping in this area here's one of the samples i'd found large bodies of lustrous course mica schist.
Bill Burton: And I really didn't have a way to explain them in the middle of the rattling you don't see them anywhere else, and I was thought they were part of a secondary fabric caused by Texan ISM I didn't really have a good a good.
Bill Burton: feel for that, however, these shifts near this sample are resemble they're identical to typical straight shift mapped elsewhere in western Connecticut.
Bill Burton: So I it's looking like both the map and the detritus data saying we can assign these rocks to the straight shifts with this solves a problem on the State map.
Bill Burton: Where by the straight schist was shown in a tight sin form coming up to the Northwest and banging into the early missoula pop rock base in here.
Bill Burton: And then disappearing not reappearing, on the other side, according to the State map but also shown over here in the waterbury quad coming in from the Northeast.
Bill Burton: And disappearing into the non-war so if we assign these two samples here to that built, then we can, and this is just a crude rendition, but we can then think about the belt actually coming through here covered up by the POP rock basin and intruded by the non wall.
Bill Burton: So that does leave a problem, and that is the nano OG age so here's here's the second of the to the eastern most coming in and I haven't i'm.
Bill Burton: very confident this Belt is intruded by non-war Granite well the one age we have from a satellite body is for 33.
Bill Burton: So a million years, so the question is, is that too old to intrude this solar devonian bell will certainly probably too old for devonian but if these rocks or solar and.
Bill Burton: Can we still arrange that but I think we also need the date the Center of the Wu Tang which may have an acadian core closer to three at, there are three at rims on the zircons here are they metamorphic that's what we thought or do they represent something else.
Bill Burton: So what have we learned.
Bill Burton: We know where the laurentian paragon guana boundary is not, and it may be confined to the corps of West Connecticut domes in western Connecticut.
Sa?d Belkacim: minute, please.
Bill Burton: Okay, pending confirmation by further mapping, we have found the missing link and continuity of maps Hello devonian rocks and Western Connecticut.
Bill Burton: And we need to try those are con ages from the core of the waterbury Dome and I your another uranium lead age from the core of the nano walk Pluto.
Bill Burton: Thank you very much.
Sa?d Belkacim: Thank you, William so now we'll open up for one quick question, please one quick question because we do, we have just two minutes to move on to next speaker.
John Waldron: I can, Walter and just a quick comment yeah I I totally agree with those mixed samples they look very like mixed post accretion samples further north that we see.
John Waldron: A couple of the ones that you showed and said were mixed I don't think that you can base too much on all the meter protozoa zircons in the 1516.
John Waldron: Those come those are very common interventions samples further north in the appalachians as as the occasional.
John Waldron: I appleton rift age around 600 million years, so if you have one 600 million year grain and a slew of Musa protozoa zero con I don't think you can say that you have gone one and component okay.
John Waldron: We when the when the academic get big than for sure.
Bill Burton: yeah we were thinking, the interval between 1500 and 2000 was indicative now i'll make a confession I am not a great student of the titles or con i'm relying on my colleagues advice on this, but you will say you also see those and.
John Waldron: They get more common, the further north you go so by the time we get to Newfoundland there's lots and lots of those in all of the rocks that are definitively on the metal or engine lijun.
Bill Burton: Okay, very good Thank you.
Sa?d Belkacim: Thank you, thank you well them for this interesting talk, so I think we have to move to our next speaker Jared Stephen from American museum of natural history.
Sa?d Belkacim: For his talk titled chasing cameron's line digital zircon results from the Manhattan and heartland chest in New York City, please go ahead if you're ready.
Sa?d Belkacim: Stephen.
Sa?d Belkacim: Thank you.
Yvette D Kuiper: Jared you're muted.
Greg Walsh: you're muted.
Steven Jaret: Thank you, sorry about that.
Steven Jaret: Thank you for including me in the session i'm going to continue pretty much directly following the previous talk.
Steven Jaret: working again to identify and trace these train boundaries, but in this case working a little bit further south and west in New York City, particularly in burrows Manhattan and the bronx.
Steven Jaret: And you might notice that this talk has a bunch of co authors.
Steven Jaret: This is also part of a field trip and new field guide we put together for the meeting and I appreciate all of the people who are able to join us last Tuesday we had some really great discussions.
Steven Jaret: But I do have a bunch of co authors here and I want to point out that half of these co authors are public school teachers.
Steven Jaret: And I want to highlight.
Steven Jaret: The program we have at the American museum of natural history, the masters and teaching or science program there's actually a graduate school at the museum.
Steven Jaret: And one of the degrees they offer is a master's in teaching art science, so we train students who have strong geosciences backgrounds and prepare them to go into teaching and high needs districts in New York City and across the country.
Steven Jaret: And one of the cool things about this program is they actually spend their second summer with us in the labs doing actual research um.
Steven Jaret: I think it's really important that the teachers, even though they're not being trained as researchers.
Steven Jaret: get some training in that and understand what real sciences, they can go and teach that so just here are some pictures of my former students and a lot of the data collected that i'm presenting today was actually collected by these now teachers.
Steven Jaret: So I want to again just show a map, this is from direct altos and it's showing sort of what we've been talking about all morning, this idea that broader New England is made up of a series of accreted.
Steven Jaret: exotic trends, with major tectonic boundaries being shown here and you'll see the red Indian line that was talked about in the previous talk.
Steven Jaret: And one of the things that's a little bit confusing, particularly when you get South and as Far West, as we are into New York City is the nature of these lines and boundaries and there's been a lot of work.
Steven Jaret: sort of discussing whether or not these are true continuous trend boundaries, and to what extent these boundaries are mapped bubble and find double.
Steven Jaret: So you'll notice, even though New York City is not in political New England we count, because the geology doesn't care and we're just down here off to the side and the lower Western Southwest corner.
Steven Jaret: The area.
Steven Jaret: um for our study areas known as Manhattan prong which i'm showing here on an old ish map from baskerville and Manhattan prong is a physical geographic province in southern New York that can consist of the Hudson highlands.
Steven Jaret: The grenville train part of the Hudson Highlands as well as the cambrian and ordovician Meta sedimentary rocks and i'm really going to be focused on those cambrian and ordovician Meta sedimentary rock.
Steven Jaret: This is a schematic timeline and strap column from Gary and adults than 16 and who's REPS within their.
Steven Jaret: showing the sort of names of the major players that will look at so again the precambrian basement here is the fordham Nice.
Steven Jaret: above that we have the cambrian or division section of settlements in with marble and loom sex just don't occur in really large areas in Manhattan and southern bronx so i'm not really focused on them.
Steven Jaret: And instead i'm going to focus on the two eliminates just members, the heartland Manhattan shifts.
Steven Jaret: And you can see here in the strap column, an important thing about this strike column is these units are largely fault bounded thrust fall founded, and so the actual.
Steven Jaret: stratigraphy here is incredibly complex and there's been over 50 years of debates and arguments of how you actually correlate, particularly because everything is fault founded.
Steven Jaret: you'll also see in here marked cameron's line which is generally identified as the boundary between.
Steven Jaret: material that is derived from the West, and that that is derived from the east.
Steven Jaret: On this particular strat column it actually lists cameron's line as a separate fault from the St Nicholas thrust and and and also would be a different fault from thread Indian line.
Steven Jaret: The mapping gets very complex and it's pretty inconsistent map to map, whether or not these are actually different thrusts whether or not they end up being the same and so it's a very structurally complex area.
Steven Jaret: And this is again charlie's cross section across New York City.
Steven Jaret: And originally cameron's line was defined by Rogers on state map as being boundary between eastward derived units from westward drive units, the nature of this has changed and debated.
Steven Jaret: But you can generally see in this version of the cross section that generally historically the interpretation of these units has been that the hartland chest.
Steven Jaret: is derived primarily from material from the east and so has a paragon one of the affiliation.
Steven Jaret: And it's been correlated with the heartland train and Connecticut and sometimes even as far up North as to what the avenue sick in new Hampshire Vermont.
Steven Jaret: it's different from the Manhattan chest in this version which is generally considered, on the other side of cameron's line being Dr primarily from Russia.
Steven Jaret: And so that's where we started with this and we're going to now take the approach to go in and move beyond just field mapping and talk about this in terms of some new geochemistry.
Steven Jaret: Because the field relationships and tectonic over prints are so complex you want to look at it more GEO chemically.
Steven Jaret: The other thing I just want to point out, is here are two different versions of maps of New York City mclaren and mccarran 2004 and the Brock Brock map of 2001.
Steven Jaret: And what you'll notice is that these maps have some similarities, but are pretty drastically different in where they put the foundry and also how they identify which unit is which.
Steven Jaret: And I don't want to dwell on this too much, but I do want to point out that there are lots of maps and some of them are mutually exclusive, welcome to tectonically complicated rocks right.
Steven Jaret: So, looking at these shifts I have to example photos of the heartland chest, this one taken on an orchard beach, and this is Manhattan taken from northern Manhattan at Fort tryon park.
Steven Jaret: When For those of you who don't know these rocks will real well, you might notice that they look.
Steven Jaret: sort of similar, yet there are some differences and that's sort of typical of these shifts in New York City, they are both courts belts bar mica schist plus or minus garnet.
Steven Jaret: plus or minus canaanite and so midnight and outcrop outcrop there are certainly cases where they have distinctive features, but then sometimes you get closer to the boundary and they look incredibly similar.
Steven Jaret: There is one difference, particularly that Charlie had noted and a lot of his work, particularly with the tunnel building.
Steven Jaret: Is they have a very different way that they break it and you can tell us when hitting it on the outcome crushing it in the draw crushers and even according to Charlie when they were doing the tunnel boring for the water tunnels and subways the hartland is much easier to crush.
Steven Jaret: And whether or not that is something inherent to the rockets off or a tectonic fabric is something we debate and talk a lot about.
Steven Jaret: So what Nick tell me and I at the museum have been doing is we've started this big campaign we're calling it the Manhattan project looking at.
Steven Jaret: These rocks in a little bit more detail and Nick has really spearheaded the geochemistry garnet geochemistry in particular and thermo brahma tree.
Steven Jaret: And one of the things that he has found is that when you look at the chemistry of the garnets particularly some of the higher abundant trace elements like men guineas in particular.
Steven Jaret: What you see is that there is a characteristic zoning pattern.
Steven Jaret: Within these garnets and when you take units an individual samples from across Manhattan and punks they sort of cluster into groupings, based on what their zoning pattern in the garnets look like.
Steven Jaret: So on the top part of this figure, these are all from units mapped as hartland and you can see that they have very flat trace elements zoning pattern.
Steven Jaret: down on the lower figure, you have rocks that have been mapped as the Manhattan shifts and they have a very different pattern to their.
Steven Jaret: manganese versus calcium zoning so we're starting to piece together assigning these into various groups, not just on outcrop pattern, and what they look like in the field, but also with the garnet geochemistry.
Steven Jaret: um I should point out here that in major element chemistry is, these are largely the same, and that these difference in zoning patterns likely reflects.
Steven Jaret: A subtly different PT path that these took during metamorphosis the ultimate PT pressures and all of us end up being the same, although they may have each taken a slightly different path on their way up.
Steven Jaret: So i've come into this now looking at it from an isotope geochemistry standpoint and I started out looking at this from a neodymium perspective, so if you have rocks that are derived.
Steven Jaret: From paragon one and terrains, that is, the previous interpretation of hartland units those should have very different source and ice topic signature than things coming off of the one mentioned margin.
Steven Jaret: So when he's a that is actually not what we see in the case of our samples so i'm plotting here excellent epsilon neodymium results from units all across Manhattan.
Steven Jaret: borough and bronx and i'm showing here that even rocks of both the heartland and the Manhattan just previously mapped all fall in the field of florencia.
Steven Jaret: And so, from a neodymium standpoint both even pelham day that have you know we'd go out there and look at in the field and it looks very similar to things like the new SEC from a neodymium standpoint, all of these seem to be derived primarily from Russia.
Steven Jaret: Looking at it from a geo titles or con standpoint, this is three samples, each of which have been previously mapped as heartland formation.
Steven Jaret: And these are going from West on the bottom working our way East across central park and what you'll see, particularly for the sample that we call the rock have no hope.
Steven Jaret: Here in the middle of central Park, these are dominated by their cons of grendel age so between 1.1 1.3 there's a small 1.8 populations not huge, and so this is what we would assume of you know laurentian derived sentiment.
Steven Jaret: same with this other sample from a little bit further east.
Steven Jaret: One of the things about doing work in central park is outcrops are separated by lots of paths and walkways and.
Steven Jaret: How much of those are natural boundaries or separation of units it's very complicated so it's possible that these two samples are separated by a fault.
Steven Jaret: it's not entirely clear in the field, but what you'll see even with this simple is it's still dominated by granville grants, but you do see a small population very small population of about 582 600.
Steven Jaret: You go a little bit further east to rocks still mapped as heartland, and this is actually a very folded section with upright folds and amphibian lights and just goes layers and what you'll see here is again it's dominated by grenville.
Steven Jaret: 1.1 ish grand, but there is a mist case not as small population of 580 and 600 ma grains.
Steven Jaret: And so we would interpret this still as Dr primarily from Russia, but there are some mixed signal.
Steven Jaret: Comparing this now to some data from Caribbean us at all 2017 and McDonald all 2014 just putting this sort of in perspective, like we were talking about in the previous talk.
Steven Jaret: The three on the top here in black, these are our new samples from New York City and then in red is the McDonald them all and kapinos that all data and particularly rock have no hope but.
Steven Jaret: West but also the rock have no hope East look from at the titles are constant like pretty much like the row chest, so in this case, we would.
Steven Jaret: suggest that these units all the.
Steven Jaret: Previously mapped as heartland from the titles are con and neodymium standpoint are much more likely to be relative with the row, and not with the more town which you see down here.
Steven Jaret: The question then becomes what do we do with this is 79th street sample that is still dominated by Lorenzo but does contain some younger grains.
Steven Jaret: And this is taken from Caribbean us at all 2017 that shows hit one of his schematics showing.
Steven Jaret: The more town before docked my wrench and basement and laurentian cover and what you'll notice in his schematic is that the laurentian cover sort of spans across the entire width of the apparatus ocean.
Steven Jaret: And so, our interpretation for what we're seeing these differences is that we're looking at either subtle differences in faces of the Meta settlements.
Steven Jaret: or Meta settlements that are coming up from slightly further east in the apparatus ocean.
Steven Jaret: And so, if you have some Meta settlement that is still derived primarily from Russia, if you are near enough to those exotic blocks, you might actually be able to have some sediment input coming in from the East, with a minor component of sediment drive from those more town trends.
Steven Jaret: And so we're interpreting these as different thrust sheets, but within primarily all entirely from a wrench and cover sentiments and I do want to point out that this idea of multiple thrust slivers within the same terrain is not terribly.
Steven Jaret: Not horribly a crazy idea, and so this is an outcrop not too far away from central park up in northern Manhattan actually only a block away from where my apartment is.
Steven Jaret: Doing urban geology is weird um and so you can see, all of these are the mapped as Manhattan just.
Steven Jaret: And there are several thrust sheets that come in one on top of each other so it's not impossible that we have multiple thrust slivers coming up sampling and juxtaposing units that were originally all derived from the same Meta settlement.
Steven Jaret: I do want to bring up one alternative hypothesis that has come up in revisions of our new field guide and discussions on the field trip last week, both Nick radcliffe and bill Devlin have asked if some of these.
Steven Jaret: Five to 600 million year grains could be rift mechanics from drifting of Virginia both the pound Ridge, Nice and the yonkers nice do have both rubidium strontium and barium lead to turtles are con ages of about 580.
Steven Jaret: So that's not our preferred interpretation for these but I don't think we can exclude it and particularly from age alone I don't know that we can exclude it we're probably going to have to do more detail isotopic work.
Steven Jaret: Maybe halftime isotopes on these are cons.
Steven Jaret: I think our nia demean them hall rock neodymium work makes it a little bit complicated for these to be rift related although if it's a small population of rift zircons in a largely.
Steven Jaret: You know fell sick chest that's dominated by Lorenzo I don't know that are neodymium would be able to rule out that either regardless whether or not these are derived from paragon one or risk, there are not.
Steven Jaret: It doesn't look like more town, and so I think what we can say is that presently our hartland samples.
Steven Jaret: do not appear to be equivalent of the more town, and so this correlation of hartland in New York City with hartland in Connecticut all the way up may not hold, and so I think there's a lot more work that to be done, linking these together.
Steven Jaret: Please yeah so i'll just end with that sort of our conclusions is that in New York City, but the Manhattan in the bronx all of the shifts that we have encountered so far are.
Steven Jaret: derived from from Russia and the differences in outcrop appearance and subtle trace on geochemistry might reflect differences in medicine and fishes and or pathways during metamorphosis so that I will stop and take questions.
Sa?d Belkacim: Thank you, Stephen for your interest in talk, so I think we have.
Sa?d Belkacim: time for one or two questions.
Sa?d Belkacim: So, if someone has a question.
cherylmoss: hello, this is cheryl Moss and one comment I would make is we find in New York City, a lot of little slivers of serpent tonight, and so on.
cherylmoss: scattered all over the place they do pop up here and there, where you wouldn't expect to find any serpent night, I think that helps support the notion that you might have lots of little slivers of you know other settlements and so on, being thrust together.
cherylmoss: So it certainly this all explains and helps explain what i'm seeing is a geologist.
cherylmoss: You know, with engineering projects all across the city.
Extra.
Sa?d Belkacim: Thank you Steven so uh.
Hal Bosbyshell: Yes, I have a quick question yeah I was wondering about the garnets i'm Stephen are those are those points individual analysis point so you're looking at TRAN sex that are just plotting.
Hal Bosbyshell: yeah man calcium.
Steven Jaret: Exactly yes.
Hal Bosbyshell: But the ones that are flat the manganese doesn't Barry with calcium that's because their individual transaction cross garnets.
Steven Jaret: Yes, Okay, thank you.
Sa?d Belkacim: Thank you Sandra are you here for.
Sandra Barr: right here.
Sandra Barr: we're now going to.
Sandra Barr: switch over to the poster presentations and the way the posters work, they are a 10 minute slot the first five minutes is a pre recorded presentation by the poster presenter, and that is followed by five minutes for questions.
Sandra Barr: So he had, I believe, is handling the.
Sandra Barr: Opening of the posters is that still with us.
Sandra Barr: Oh yes, okay.
Sandra Barr: All right, so our first poster if you want to get queued up is by Eric scoot over and co authors on FDR identification of serpentine polymorphous in polished sections and.
Sandra Barr: First off we'll hear the recorded.
Yvette D Kuiper: as well, here we go Hello everyone, my name is Eric skin over the summer I did a radio with Dr Steven gerrard at the American museum of natural history.
Yvette D Kuiper: Our project looked into it FDR communities to analyze the structural differences and polymorphous of certainty which had the exact same chemical structure.
Yvette D Kuiper: difficult to differentiate we're looking at that and Polish sections where they are normally look at in bulk powders the orientation effect.
Yvette D Kuiper: Is there for President.
Yvette D Kuiper: Because the trains are all in one locked orientation, as opposed to an average of all different orientations and the powder so we're also looking into that little tidbit the structural analysis.
Yvette D Kuiper: The background on this is that the world ramen is currently the current.
Yvette D Kuiper: standard for identification episode is also used but it's not always as accurate as Ramadan so they're looking for another rapid non destructive method to analyze the samples.
Yvette D Kuiper: Now, like I said before they are normally done powders now, it can be done in sections with X 31, but it has not been done very common.
Yvette D Kuiper: FDR has been shown to be able to Polish sections, but not as presently as this research.
Yvette D Kuiper: So we have some background information from the FDR in boulder powders with Missouri integrate with previous and scan or samples and I started day for comparison, they have Terry.
Yvette D Kuiper: ti our data, and we also have drama and data to compare the accuracy and efficiency of this method now this project is mainly focused on the appalachian.
Yvette D Kuiper: samples that we have from doctors Cindy Martin and Steven gerrard and The hope is that because certain tina's manager mineral and subduction zone.
Yvette D Kuiper: That knowledge of the polymers will help us constrain the pressure and temperature conditions of these abductions that comes.
Yvette D Kuiper: with knowledge of the partners which format different pressure temperature regimes we should be able to extrapolate the.
Yvette D Kuiper: Formation conditions of the circle team themselves, thus far, as the dating this or subduction zone conditions.
Yvette D Kuiper: The way we did this as soon as the neck ar has the American museum of natural history, I operated remotely from Holland Michigan during the pandemic and, as you can see here, it was reasonably able to visit over break.
Yvette D Kuiper: So we were scanning 100 square micrometres spots, as seen by the Red Square in the diagram showing to the right.
Yvette D Kuiper: And we scan 283 brains from eight different samples to elucidate which polly Mars for President mentioned samples and then compare them to the accelerate.
Yvette D Kuiper: The results below show that the samples were matched with color coded numbers and we were able to figure out where the integrate motivate and other party marks and the.
Yvette D Kuiper: orthopedic surgeon precursors present as well in this example right it's lizard it has shown the black is integrate the red is shown, because we cannot.
Yvette D Kuiper: Always determine different polymers but the xr he said that there was just integrate in this sample we found lizard right as well.
Yvette D Kuiper: So, you would think that the code spots and the color and sample correlate where we are we're also know that the square response were 100 square meters, which is not visible to the naked eye.
Yvette D Kuiper: So when we compared me results, the original analysis by X 30 we found was in the table below some samples did have the same polymers and some of them even have new ones.
Yvette D Kuiper: So this shows that this is actually a musical method to find other partners present in these sections.
Yvette D Kuiper: The analysis, we did on these results was we combine all the spectra together as you instantly to mobile piece so then we separated was peace.
Yvette D Kuiper: Between one was about 975 which we believe is the most right based on the background knowledge and more about 1015 numbers, which we believe is integrity now those individual peaks shown below had an orientation facts about 15 with numbers that we.
Yvette D Kuiper: attribute to the orientation, we then compare those individual spectra to convert them to confirm them and i'll apply mark that we're seeing.
Yvette D Kuiper: and based on christiansen effect of ruffians square or Python database program we were able to actually confirm that what we're seeing wasn't a great Elizabeth and other partners and or the piercing precursors within the samples.
Yvette D Kuiper: So in conclusion, we found that the orientation effects from the grammar range from about 10 to 30 centimeters centimeters inverse wave numbers which does not inhibit the 75 wave numbers for the actual.
Yvette D Kuiper: volume worse, the Christians and future than actually allows for identification of the pie mark and comparison.
Yvette D Kuiper: which gave us conclusive evidence that we work on the climbers we thought we were so that shows that FDR does seem to be a feasible and I think for rapid identification of these partners.
Yvette D Kuiper: Control work will evolve further sample analysis and quantification of the spectrum with multiple signals, so we look forward to that.
Yvette D Kuiper: With that i'd like to thank Dr SLIM margins Steven gerrard at the American museum of natural history and the National Science Foundation for fun Thank you i'll be happy to take any questions.
Yvette D Kuiper: I have to figure out how to stop the screen share my belton has disappeared somehow.
Sandra Barr: So I have that problem around this morning.
Sandra Barr: Thank you Eric are you are you with us i'm.
Erik Schoonover: right here.
Sandra Barr: Thank you audience okay um the idea, though, is to open it up for live questions so does anyone have any questions for our.
Sandra Barr: poster presenter.
Sandra Barr: Oh, I can see, you see that's shared screens.
Yvette D Kuiper: i'm trying to share with them.
Yvette D Kuiper: sorry about that.
Sandra Barr: I thought it was just me being incompetent this morning but it's good to know, I have some.
sally's.
Sandra Barr: A little hard on Eric, though, so do you think this is array success.
Sandra Barr: Do you think this is a method that I noticed that Stephen in the previous talk mentioned serpent night lenses all over New York or one of the.
Sandra Barr: comments to his talk did so Is this something that you might use to characterize those and figure out where they're from or take take them back to their provenance.
Erik Schoonover: yeah I actually think this is a pretty solid like column complimentary method to ramen, and so what we've been seeing with.
Erik Schoonover: That I mean you can use xr D and use ramen but they have Dr just offers another way to identify these really small serpentine grains.
Erik Schoonover: And since they're just small slivers it's a another indicator of just like pressure temperature conditions, and especially with the over printing that we can fit multiple different 17 poly marks in different samples.
Sandra Barr: So the samples that you were using are they from from the appalachians.
Erik Schoonover: yeah so we use a bunch of different samples, all the way, so we went as far south as Guatemala and then all the way up to.
Erik Schoonover: Like Connecticut area and a bunch of different areas in between, it was like one or two from each locality, and some of them were from the appalachian and some of them were from the New York area oh.
Okay.
Sandra Barr: anyone else have any questions for for Eric.
LeeAnn Srogi: Just a quick question.
LeeAnn Srogi: By.
LeeAnn Srogi: That was a really nice poster.
LeeAnn Srogi: Maybe I missed this I apologize, can you what's your sample preparation like thank you.
Erik Schoonover: yeah so the samples I believe we're just.
Erik Schoonover: sliced and then polished for X 30 analysis so they're just like a little bit thicker than a thin section, but polished, to the point that X 30 can be used, which then we can do reflectance measurements with FDR.
Sandra Barr: So we have a chat here from from Stephen saying Eric is too modest so as this.
Sandra Barr: As his advisor i'm going to point out, he did this.
Sandra Barr: As an undergrad and during the pandemic so entirely remotely wow.
Sandra Barr: that's amazing.
Sandra Barr: Thank you, Stephen and and thanks Eric for a really interesting poster We look forward to hearing the end results of your of your study.
Erik Schoonover: Wonderful thanks so much.
Okay.
Sandra Barr: Okay we're now ready to to move on and we're going to bring cited back and.
Sandra Barr: said ball councilman and his co authors to talk about the ED akron courts as a group in in Morocco metal CRATE tonic solicit large igneous problems.
Yvette D Kuiper: hi everyone, my name is a professor from the.
Yvette D Kuiper: University.
Yvette D Kuiper: in Morocco i'm glad to be here today to talk to you about the ejaculating was it's a Meta crashing into basic marketing news programs running late children ages from mozilla stick with something different.
Yvette D Kuiper: So the different value from the classroom in the record is a candidate for understanding the lady, they can, and what is it that cincy marketing should progress.
Yvette D Kuiper: Indeed, the origin of the slip is highly debated from being in subjection related might imagine our power, the inspiration of the APP it is optional in in the linking to the crowdfunding boundary of the West African gratin at the end of the day in Africa.
Yvette D Kuiper: As you can see the address fields of Morocco is a segment talking with proper Islamic finance, we can run the build system located on the mountain age of the body processes with West African kraton.
Yvette D Kuiper: It consists of a series of non north east, south Southwest alignment the leaders we need think further by us with cinnamon three formations is for them to the north, by this and as we highest mountain range from which is painted by yourself, unless.
Yvette D Kuiper: The ticket for the last the last segment, which is an automatic last end you're located within the high atlas mountains.
Yvette D Kuiper: it's a particular I said it is bachelor enabling the case for the weather that sleep.
Yvette D Kuiper: Indeed, different body displays the entire succession of horses that group from a 518 to 545 million years, then it also smelly of working for kind of plastic and preventive rocks in triggered by the derivative and granted bikes work.
Yvette D Kuiper: In your study would present your run your lead super angels on the different body wants to grow.
Yvette D Kuiper: or blue planning and forecasting that we compare with all the different ages of 10 and Western Group but, as were in the mountains.
Yvette D Kuiper: Jackie mclean digital money, what is it my magic rocks present wash competition from offensive to metric tons.
Yvette D Kuiper: divided the onto the hypothetical can answer is complicated enough an African constancy possible vision on.
Yvette D Kuiper: The present positive it's an idiom at 570 million years or longer initial traction and other ages, ranging from oakland 80 to one point 14.
Yvette D Kuiper: billion years indicating almost imprinted in your properties week source, with immediate environment of the development industry, it was a magnetic rocks present Iranian laser for ages, ranging from 570 725 50 million years which are present the whole language activity of the words that.
Yvette D Kuiper: But the bottom of the city similar ages within errors of 570 7574 and 574 million years respectively ended by adding massive economic opportunity flow and as count granted at the top and, obviously, the truth is dated 562 million years and the simple from old and running died is dated.
Yvette D Kuiper: 515 years.
Yvette D Kuiper: He Jacobean Iranian live ages data have been combined it for the hotel, plus the current on don't see the distribution of these ages is Eric and shows different peaks the bottleneck respond to the pieces.
Yvette D Kuiper: Tougher was that magnetic event which is mostly forensic seems to be not basic during this time versus other bigger picture of a statistic marketing is purpose.
Yvette D Kuiper: We propose a generic model where was it sleep or period within the competent interpreter Nick each of the West African Breton in a cross functional region.
Yvette D Kuiper: marking the end of the Pan African population period this given is associated with a higher original hint flu precursor for major precious metals deposits in the.
Yvette D Kuiper: class and it's followed by a Korean tokenism pretty good of the reporting that will lead to the development of the production during the audition Thank you.
Sandra Barr: Thank you.
Sandra Barr: Are there any questions.
Yvette D Kuiper: I do I.
Sandra Barr: have your hand raised.
Yvette D Kuiper: I am uploading that's my applause oh I don't have a question.
Yvette D Kuiper: So I really liked the compilation that you made so each of the of the dates, do you think they look different for different continents, like the Pan African Belt is nearly everywhere, could you potentially distinguish between the anti atlas signature and Amazonia and.
Sa?d Belkacim: wherever else, thank you for an interesting question.
Sa?d Belkacim: I forgot to mention in my bolster that we also have.
Sa?d Belkacim: enumerated zero contagious.
Sa?d Belkacim: That branch from 632 to 6 million years, which is analogous to.
Sa?d Belkacim: desert desert can peaks in all the work on a sentimental red rocks of what we call the booster de and several groups, so it means that it's it suggests that the Community.
Sa?d Belkacim: There is a country, we do have all those two groups, which means the several beneath the weather, that the West to grow in this area.
Sa?d Belkacim: that's this thing we don't we don't we don't have we don't have this consultation at the at the eastern part of the month on atlas, which means that maybe it's.
Sa?d Belkacim: Another terrance and, but we have to get more data from from this area to do.
Sa?d Belkacim: This consultation.
Sa?d Belkacim: Right.
Thank you.
Sandra Barr: Applause, is very difficult in.
Sandra Barr: In a zoom setting unfortunately so.
Sandra Barr: yeah sure, otherwise you will hear.
loss.
Roger Bloch: Is there time for a question.
Sandra Barr: Yes, there's still several minutes left for questions.
Thank you hi side.
Roger Bloch: i'm wondering i'm great talk i'm wondering, the the the your last figures with this schematic cross section that's been used so often for the medical doctors, a certain period with the you know exceptional strikes slip.
Roger Bloch: You you show on that a feature that it has a question mark and it's kind of put in and taken out of different renditions with the with the seduction.
Roger Bloch: subducting plate to the to the West, I was wondering if which is questionable is wondering if your data or you, through your work, have an opinion on the existence or non existence of that.
Sa?d Belkacim: Is this is the wash, this is the question because, as I told in at the beginning, the the words is that magnetic givens is is is still debatable 4 billion magnetic Arc magma.
Sa?d Belkacim: or not magnetism or either a middle ground winnick magma isn't because during this period, I mean in the late in the gathering time the stricter is.
Sa?d Belkacim: We are in an external across national.
Sa?d Belkacim: region so maybe we will, we will not.
Sa?d Belkacim: it's it's not in favor of mathematic Arc soup diction equivocal subduction that's why we are we go with the middle chronic model.
Sa?d Belkacim: With.
Sa?d Belkacim: A mathematic senior which is integrated from previous subduction.
Roger Bloch: Thank you.
Sandra Barr: Okay, thank you, are there any other questions.
Sandra Barr: Okay.
Sandra Barr: No questions I really hope that.
Sandra Barr: Kovac goes away so that sometime during the duration of ITC project 683 we can all get to go to Morocco and see some of these rocks that we're.
Sa?d Belkacim: Hearing yes, of course.
Sandra Barr: It all sounds very fascinating would these be among the rocks that we would would be able to see on the field trip.
Sa?d Belkacim: Yes, maybe next year.
Sandra Barr: well.
Sandra Barr: We hope so, but it's impossible to know.
Yes.
Sandra Barr: Okay, thank you very much, we can move on.
Sandra Barr: move on to our next speaker.
Sandra Barr: Okay.
Sandra Barr: Thank you, our next poster is being presented by Dan van Ryan, and the title is to try to cirque on GEO chronology and northern appalachian apollonian terrains insights into base and development and turning juxtapositions and first of all, the recording.
Yvette D Kuiper: To this question this question illustrate some of the major trends and data from Babylonian Meyer train of Cape Breton island and the relationships between terrains based on a visa intrusive history and travels or conquer populations.
Yvette D Kuiper: First, we will look at two samples from Mayra train the first Bengal road formation and the second is from scan like permission.
Yvette D Kuiper: They samples but contain major populations and circling grains with angels between 517 620 and between 615 600 million years and, as far as some special courageous.
Yvette D Kuiper: Was crunching and Dr courageous are consistent with derivation from volcanic and associated Platonic units documented in sterling belt.
Yvette D Kuiper: Just six in East Bay hills, which is six trenton and the for sugar, which is 575 million years old, these are both prominent in the region.
Yvette D Kuiper: And the prominent peak between 519 610 million years has not really been matched to ages now exposed to all kind of group atomic units similarly we don't have really good.
Yvette D Kuiper: estimates are babies personalization ages that match the 642 620 peaks these ages of brains are very often seen in inheritance in 620 protons so we know that there are there, but they are currently not exposed.
Yvette D Kuiper: So comparisons of the titles are coming populations between different trade shows and very complicated relationships.
Yvette D Kuiper: For this comparison where i'm using samples that I can run an order and we're only using samples that are welcome strained with their strategy graphic relationships clearly documented.
Yvette D Kuiper: The first slide shows individual samples from the abalone and trains in Nova Scotia Newfoundland and South East brunswick on a cumulative probability pot.
Yvette D Kuiper: it's going from this plot, that there are no particular patterns and there's no obvious groupings of any samples and you'd be hard pressed to come up with any idea of which samples are from which trains.
Yvette D Kuiper: A similar plot with me Cape Breton sample shows the same thing with Australian the different samples from the same terrains.
Yvette D Kuiper: don't necessarily have the same details around calculations, which means that the basis of these are being deposited into are more complicated than just one single base and.
Yvette D Kuiper: When samples from different areas replied together the different trains are slightly more distinct and there are some trends that have common patterns.
Yvette D Kuiper: In this part of the details are compilations from New Zealand samples are very similar to those from the Highlands much less similar to those from the color coded highlands and from Iran Caledonia turing's.
Yvette D Kuiper: When the idea and transfer that assertion your browser added it's noticeable that the brooklyn bridge or trains are distinct image or tone populations, about the winner train looks a lot more like Babylonian turns.
Yvette D Kuiper: So what you could clear from these individual samples and the groups of trains.
Yvette D Kuiper: that none of these individual sample should be interpreted as having an abalone or any other train fingerprint or signature without corroborating.
Yvette D Kuiper: Information, the absence of systematic variation further demonstrates that the president's older brain should not necessarily be used to interpret the position of abalone during the cambrian or the timing of its drifting on guana.
Yvette D Kuiper: If these categories and Evelyn interactions were juxtapose temporarily by around 515 million years, as proposed in recent tectonic models, then, is there a con derived from again Gary i'm actually be the ones, contributing to the prominent age peaks at 515 or 18 years.
Sandra Barr: Thank you, damn.
Deanne van Rooyen: i'm here gonna wave look him up at.
Sandra Barr: Okay, good you're here.
Sandra Barr: Great any questions for the end.
Sandra Barr: I find it hard to look on the chant and look at people for raised hands and everything all at once here so.
Sandra Barr: So.
Sandra Barr: I not sure it's all right for me to.
Deanne van Rooyen: ask you a question is.
Sandra Barr: Since i'm a i'm a Co author, but.
Sandra Barr: Clearly I, the more data we've obtained the more confusing things have become, in some ways, or would you agree with that, or do you think we're starting to see some patterns here that might make sense, ultimately.
Deanne van Rooyen: I do you think we start seeing patterns, because I do think we see.
Deanne van Rooyen: When all the data from different areas are plotted together that's when we can see differences between terrains that I be comfortable with saying yes that's natural difference.
Deanne van Rooyen: But I do see with all the new data we get it's the same story every time that one single sample we should be really careful about using the word fingerprint yes, there are going to be things that are common and things that are.
Deanne van Rooyen: Different between samples, but the idea that eat any one sample can have a 100% fingerprinted links are to one terrain.
Deanne van Rooyen: is not something we should be doing I think if we look if we pull back a little bit and look at the larger data sets with more samples plotted then we see some of that, but I would having seen all of these I would never ever be comfortable taking the.
Deanne van Rooyen: titles or con spectrum, from one sample and saying that the titles are con spectrum is the signature of this terrain therefore it's the same it you always need that extra evidence and you always need.
Deanne van Rooyen: Things that are a little bit bigger than that so that that would be my takeaway from this is that the idea that we can fingerprint things.
Deanne van Rooyen: would make me stay up at night.
Sandra Barr: Even within one particular.
Deanne van Rooyen: area within within Allen terrain and it's interesting that.
Deanne van Rooyen: The, the more you zoom in the more you look at the differences between individual samples in individual.
Deanne van Rooyen: terrains in a small area things that are even close that i'm very close together that's when you see the biggest variation so you don't really see the similarities until you zoom out and you put things together.
Sandra Barr: And the same is true and again there a, of course.
Deanne van Rooyen: Absolutely, yes.
John Waldron: You may have commented on this because I had to miss part of your talk Dan but you do see systematic disk differences between different types of sandstorms it seems to me that quote sites often give you different answers from.
John Waldron: Poorly so absolutely and that shallow marine and flavio rock so much less consistent than turbo dodge me given terrain.
John Waldron: That your experience.
Deanne van Rooyen: That is absolutely my experience, and if we had turbo diets I would sample.
Deanne van Rooyen: them so happy, but we.
Deanne van Rooyen: don't so what one thing we do see almost every single time we do this, is that the cleaner, the Court site is.
Deanne van Rooyen: The older the zircons are the clean chord sites tend to have old stuff the young, the things with that are Semites or have clear volcanic input those tend to sample the younger stuff so that's that's a significant.
Deanne van Rooyen: take away from these I think Liam has a question, I think that was a hand.
LeeAnn Srogi: That was really interesting and beautiful work i'm i'm curious as to whether there are statistical methods that can be used to better evaluate.
LeeAnn Srogi: The differences among populations and maybe even different sample types so things like even something as simple as a principal components analysis or some other statistical methods.
Deanne van Rooyen: i've i've tried them i've tried to put all of these through the color of smirnoff and the test of similarities and all of those things.
Deanne van Rooyen: And they are consistently between five and 7.5 and Point seven they're never at the completely dissimilar end of the scale and they're never at the completely similar end of the scale.
Deanne van Rooyen: And once you get into the principal component analysis anyone who's.
Deanne van Rooyen: done it at this point has always put abalone and area together as one big unit, so there hasn't really been a chance to try to separate them.
Deanne van Rooyen: But, based on the sort of early tries of color of smirnoff and the similarities and those sorts of things.
Deanne van Rooyen: I suspect will will be somewhere in that sort of nebulous range of years there's similar but also they're not similar so I haven't that's why I didn't put them on the poster because that's exactly what it said was.
Deanne van Rooyen: yeah some things in common something's not so in with the big scale really bigger scale analyses that happened on with competitive analysis people have been lump those together and said so The other thing that I wanted to try, with the.
Deanne van Rooyen: One where you plot them with a positional age versus two titles on spectrum, so that is a little bit more promising but let's come back to that next year.
LeeAnn Srogi: Thank you.
Okay, thanks, Dan.
Sandra Barr: We should move on to our next poster but Jeff pollock uranium lead zircons your chronology a little low in Granite penobscot Bay in my or coastal main.
Sandra Barr: And we'll listen to the recording first.
Sandra Barr: And then talk with Jeff.
Sandra Barr: what's going on here huh.
Yvette D Kuiper: Oh Jeff did you record a poster.
Or did you just if.
Sandra Barr: there's doesn't seem to be any recording there.
No.
I don't know what that means.
Here we go no.
Yvette D Kuiper: Your slides.
Yvette D Kuiper: There Jeff i'm sorry.
The oh.
Sandra Barr: Maybe.
Sandra Barr: You want.
Yvette D Kuiper: yeah.
Jeff Pollock: Okay, I can give I can give a quick on the fly discussion so it's a this was born out of a project and regional mapping project by Doug roshan myself, where we were mapping quadrangles on the coast of maine at the request of the maine State governments.
Jeff Pollock: In really to to update the regional bedrock geology in the penobscot a liar and to really assess the position of ellsworth in larger game theory was kind of the larger outgrowth of this um.
Yvette D Kuiper: I don't know if this helps you enough.
Jeff Pollock: Yes, yes, we will be helpful, so I mean it's you with all the recent work done in game theory it's it's.
Jeff Pollock: All about ellsworth in that the age dated by Klaus Schultz is the same age as the telecom volcanic in Newfoundland I five a week for the ellsworth schist but it's interpreted to represent an oceanic rift which is different than the tectonic setting for the same age sequences in Newfoundland.
Jeff Pollock: And the deformation in the elsewhere system me go ahead to the next local happy that, please.
Jeff Pollock: Yes, so the deformation and the ellsworth is much more complicated.
Jeff Pollock: than it is elsewhere in Ghana, Nigeria and we were on a field trip or field excursion with Henry Barry and Dave stores myself and dobroshi and we're standing on the.
Jeff Pollock: Illinois granites this deformed Granite that's exposed on the coach and it has the same D to the main.
Jeff Pollock: foley ation is the ellsworth schist but we didn't know what the setting was we thought it actually might be basement to the ellsworth.
Jeff Pollock: that's what we're curious about we know the telephone group in New Zealand sits on the 565 are ketones to the crypto baby back sweet but wash is underneath ellsworth it's especially important, if it's this oceanic rift.
Jeff Pollock: It was interpreted also to be possibly related to the feeders of the volcanic rocks in the ellsworth schist so, is it the same ages El for sure is it basement.
Jeff Pollock: So that's we collected a sample did uranium lead at memorial university and it came out to be 492 which was much younger than we thought because it's younger and beautiful zircons.
Jeff Pollock: was a multi grain fraction three that were aerated all our concordance So this was great downing's worker co author for 92 so much younger.
Jeff Pollock: And what's unique about us that is younger than the casting volcanic so that's an ex a mildly deformed lower green shoots fast these volcanic sequence that sits.
Jeff Pollock: On comfortably on the ellsworth and has pebbles of the of the form bells worth in the casting so the main deformation in the ellsworth is actually younger than the casting vote panics which is not not what we've what we expected, it also means to granted is not.
Jeff Pollock: basement and it's not the feeder to the volcanic.
Jeff Pollock: So we can get an old a maximum age on the main deformation in the elsewhere shifts the youngest age is really only constrained by a cross cutting bake and it starts to be slurring feeders to the acadian cadillac mountain secrets.
Jeff Pollock: But when we look regional go ahead event to the.
Jeff Pollock: To the Church.
Jeff Pollock: That Those are just some pictures of the granted so it's in for granted, has to mean the main foley ation in the Granite years the same detail and the shifts but there's this older structural pattern in the shoes, now we still don't really have an agent, we know it has to be pre 503.
Jeff Pollock: But regionally, I mean the age of the limo and Granite now exactly the same as the Cameron road granted in new brunswick that's a 490.
Jeff Pollock: deformed granick that intrudes the carpenter brooke formation, and so we are correlating the lemoine granted with the Cameron road in new brunswick it seems that the Northeast virgin deformation in maine and new brunswick seems to correlate really well.
Jeff Pollock: What we don't have house is a minimum wage on this deformation in this thrusting so we know it's related to thrusting a placement of the ellsworth rain.
Jeff Pollock: Where it's thrusting the turtle help head fault over the cooks and group, but what is the minimum age of this we.
Jeff Pollock: Think if its correlation with new brunswick holds it would be the same, it would be a penobscot and not much not anything younger a cylindrical even it minimum age would be acadian.
Jeff Pollock: on that.
Jeff Pollock: we're submitted this for a publication in cj yes So hopefully this will come out i'll put the the final tectonic diagram that's on the on the poster we since updated.
Jeff Pollock: Since we since we did the poster for submission in the paper so here's the just the chart showing that correlation between Illinois and the.
Jeff Pollock: The Cameron road granted it's a deformed sequence exactly the same looks the same as as the as the Illinois and roads it's the same age so by that correlation the.
Jeff Pollock: 479 age and the Stewart and gabrielle would be the minimum minimum age of deformation.
Jeff Pollock: In maine pre correlate these together in new brunswick but we don't have a direct correlation to mean it's something we've discussed to go back now and try and get more age dates, to try and constrain that minimum information.
Jeff Pollock: Apologies about no video I don't know what happened.
Sandra Barr: Well, may not have been your your fault.
Jeff Pollock: This this has since been updated so this is now outdated, since we did the poster we myself and dub myth and decided to change this, the updated version will be in the publication.
Sandra Barr: Okay, thank you Jeff and sorry to put you on the spot there.
Jeff Pollock: But it's okay.
Sandra Barr: shows yet again man every time you get a date, you need several more in order to explain the the one you just got.
Sandra Barr: Anyway, great job interesting study any questions for Jeff.
Sandra Barr: see anything on the chat.
Jeff Pollock: or Doug Doug is here too.
Douglas Reusch: yeah we can.
Douglas Reusch: So the latest suggestion one working hypothesis, to explain the both the new brunswick scenario and hours by comparison would be.
Douglas Reusch: Rigid subduction.
Douglas Reusch: To deform the pre trauma duck rocks.
Douglas Reusch: As the rigid goes by.
Douglas Reusch: that's a nice explanation for storage and gap row.
Douglas Reusch: And then, once it goes by your resume the second episode of back are spreading so this would be similar to cases model with where he has a CMO causing the penobscot but.
Douglas Reusch: The scenario a working hypothesis would have the iPad and spreading Center doing the same thing.
Sandra Barr: Okay.
Sandra Barr: Thanks Doug.
Sandra Barr: leann.
LeeAnn Srogi: I i'll jump in with a quick question.
LeeAnn Srogi: The defamation structures in the Granite.
LeeAnn Srogi: Are you confident there they post date the crystallization of the Granite or could they be sin magnetic defamation sort of.
LeeAnn Srogi: The MAC that granted intruded into an actively deforming environment, thank you.
Jeff Pollock: I think their their posts deformation perhaps dog what your thought on that.
Douglas Reusch: I think that the main fabric in the ellsworth affects everything yeah so it's a post.
Douglas Reusch: Volcanic sand post Granite.
Sandra Barr: Okay Thank you everyone.
Sandra Barr: He that are you going to be able to manage your own your own video.
Sandra Barr: or next poster is the lead author is Yvette Cooper and the title is uranium lead to try it Oh, Sir Con analysis of sedimentary rock some southeastern New England avalon terrain in the US appalachians evidence for a separate crossbow block.
Sandra Barr: auto recording that's.
Yvette D Kuiper: exciting to watch myself.
Yvette D Kuiper: To present to show new titles, you can call us from sacramento sacramento samples from the south eastern humans avalon three is a circle around the factoring in the appalachians and it shows in orange in the southern part of figure one a.
Yvette D Kuiper: figure we still orange so there's three hours long be like and also Chicago shuttering and that the northern part of its merits of the best memories of the best running.
Yvette D Kuiper: It correlates we always have loan interest in Canada, South of the same Lord should be the same blue dashed lines, the origins and needs to each of the rapture mutual consent.
Yvette D Kuiper: So we collected during that visualization I should be a master analysis on jurgen from seven samples from various usually interpreter ship things so it's not from the view project information from courtside enough in for West in the sample see for the cnc 44.
Yvette D Kuiper: Oh sorry.
Yvette D Kuiper: I don't know why doesn't go to the next slide.
Yvette D Kuiper: Because our valleys of trying to them are from the new brothers right blackstone group, which is also coincides and that those are for the ashram datum subterranean they are the other two samples for us east.
Yvette D Kuiper: One is from their noise everwhere information it's escaping me to hop in here, Russia and.
Yvette D Kuiper: Then we also took two samples from the passionate can you point of Haitians in southern islands as far as a new group and that.
Yvette D Kuiper: This is useless.
Yvette D Kuiper: it's not talking about the way slide so so.
Yvette D Kuiper: Jeff.
Sandra Barr: You just do it.
Yvette D Kuiper: yeah so so.
Yvette D Kuiper: So it just told that these are the samples that we took.
Yvette D Kuiper: And i'll just speed up a little bit so.
Yvette D Kuiper: So, four of them or five of them.
Yvette D Kuiper: For four of them are two of them are from the whole led me into sort of them are from the assessment that's answering one is from it's also detriment that entering and these are from the Newport formation, so let me look at data.
This.
Yvette D Kuiper: is interesting so Actually, this is not so bad so wait a minute we have good data.
Yvette D Kuiper: All these blue shambles here the blackstone.
Yvette D Kuiper: Group and the plainfield formation, the blue samples here playing field formation blackstone group.
Yvette D Kuiper: They all show more or less the same the types of work and signature do must ages there Tony can you can you can read them really small here and the zoo can the title she can she can she looks like your typical avalon during.
Yvette D Kuiper: The.
Yvette D Kuiper: North attleboro formation by hoping he'll hear it also looks like typical apollonian signature, but it has this larger 600 million your peak so it's younger than a Matthew i'm gonna.
Yvette D Kuiper: fiction than 1 million a year, and these, these are the apollonian signature by the way for reference this colonia for New England, this is not apollonian for Canada i'm the Newport formation.
Yvette D Kuiper: that the new connect formation and the pricing information snooper group that they look significantly differently, and in particular that if this lords seven and the 33 or 745 million year peak the smells really typical for apple.
Yvette D Kuiper: So the question is how did that happen Why are these two samples so significantly differently from.
Yvette D Kuiper: The remainder of the avalon during so first of all, the for samples or five samples the blackstone group the blame fields formation in the north attleboro formation this all looks like typical avalon during, so this is not very much in question, the support group, it looks different and.
Yvette D Kuiper: The question is why, like is that's a question has been asked conductor said the graphic interval were first, you have to end the devastation of the plainfield formation and blackstone group, you have typical apollonian signature.
Yvette D Kuiper: Then.
Yvette D Kuiper: The new words group, it may have been deposited at the same time or later than the blackstone group and plainfield formation So surely have different.
Yvette D Kuiper: Signature for some reason, what, why is that is that because you have input from some different source during a time, or is it the different block.
Yvette D Kuiper: And then later on the North attleboro formations younger so then you're back to apollonian signature so for that reason we do the same thing it's likely that this is your sister is that the graphic interval we think it's actually a different block.
Yvette D Kuiper: And the title jerkin signature is similar to.
Yvette D Kuiper: roxy defines independent African belt, in that, in the North West Africa on the on the Atlas So there you have some dairy have like an Arc is your signature is your contract to it factory at around that AIDS so that's kind of the most likely.
Yvette D Kuiper: source for these your guns metal earlier, maybe they come from Baltic out for like an offshore irk missing that's less likely just because there's no evidence for children are today it's a fair interpretation but there isn't really any evidence for it out.
Yvette D Kuiper: So what do we have ETF REPS that look like alone yeah we've rock sets in our mind do not really look like apollonian the abalone rocks the desert and signature we agree is almost at their most consistent it's like an Amazonian Balkan signature or there's a paper also by my.
Yvette D Kuiper: PhD students elysee vision or she's not a PhD student anymore, the utilities him have him signatures for some of the blame for the reformation rocks.
Yvette D Kuiper: And that's your conclusion that looks mostly like baltika Amazonia.
Yvette D Kuiper: So, this does not so why, why is that is that, because this is some different terrain that came in separately after apollonian but, before the only Gideon did amalgamate with colonia sometime early on in the s3 and then it will became part of North America.
Yvette D Kuiper: Or did this, maybe come into this become part of North America, at the same time as the direction the Georges bank, so the theater but as haven't come during the formation of India and.
Yvette D Kuiper: Then the restraint of after the breakup of it so they'll show different interpretations for way the Newport block might be different.
Yvette D Kuiper: right there may not have been the most relevant but that's what it is.
Sandra Barr: Thank you, if that yeah so I don't know what's going on there, but anyway.
Sandra Barr: Good job put you on the spot okay um, are there any questions for either.
Douglas Reusch: I have a question comment.
Douglas Reusch: So almost 20 years ago but ED landing suggested going to look at the list of strong in the fort Adams formation, I think, are big dollar stone blocks in Milan.
Douglas Reusch: And he.
Douglas Reusch: I never understood his reasoning, but he thought there was a major boundary from that my launch in Newport through Isles borough over to the good on my launch in Wales.
Douglas Reusch: So you might want to write to him about that okay.
Yvette D Kuiper: Sorry, I was just put Adams formations here right Is that correct, am I pointing at the right thing.
Sandra Barr: now know you got up your screen.
Yvette D Kuiper: I don't have my screen okay nevermind.
Douglas Reusch: looks about the right place for a boundary between your two domains.
Yvette D Kuiper: As possible yeah.
Yvette D Kuiper: Thank you.
MDThomefolder: Can I ask a question.
MDThomefolder: For sure um So when I read.
MDThomefolder: The Bailey paper that had the list of problems that doug's just mentioned, he talks about this photography down there that that the Meta sedimentary units are in her bed with.
MDThomefolder: pyroclastic rocks and tough so wouldn't it be seems to me and more direct approach to figuring out the age of those and where they belong it's not through the trial Sir cons, but by dating the toughs do you have any and getting a TIM state, so we really know humble.
Yvette D Kuiper: So, but then we know.
Yvette D Kuiper: Is is actually diagnostic, though, does that give an answer necessarily.
MDThomefolder: If you go to crystallization age to me that that ties you to an event that, then you can relate to events in other places, whereas as we've heard.
MDThomefolder: A lot of talk today about the Detroit all Sir cons and DNS DNS cautions I think are really worthwhile i've seen it in Boston I got one sample that had nothing but 599 cents, but that didn't mean it came from a different terrain.
Yvette D Kuiper: know exactly so so the The trouble with ED akron.
Yvette D Kuiper: Volcanic says that's the reform people anywhere so How does that tell us.
MDThomefolder: Where would that you're if you're if you're saying the Newport block is a totally different thing and even part of Africa, then maybe your toughs are giving you ages of African events.
MDThomefolder: 714 and the.
MDThomefolder: which we don't find well now Sandra has them in the kovack woods Sandra and Chris but I mean it would be nice to find out what the.
MDThomefolder: igneous ages are in addition to the Detroit all ages.
MDThomefolder: I mean you can see i'm just a dyed in the world tim's.
Sandra Barr: person and.
MDThomefolder: It.
MDThomefolder: feels like there's a lot of information out there, that would be useful to have before jumping to any of our conclusions I.
MDThomefolder: baltika for me is the sake of argument.
Sandra Barr: I think I think we should move on to our last poster presentation, and this is by Bob winch and hopefully his recording will work.
Sandra Barr: Okay, thank you, Bob and thanks bill for your question um I think we'll wrap it up there i'd like to say, thanks to all the poster presenters but especially to those who.
Sandra Barr: agreed to switch their originally submitted the talk to poster that was extremely helpful for us to get everything fitted into the the session.
Sandra Barr: And I want to now hand it back over to Yvette who's going to wrap things up, and I want to mention that there are two talks in the patrol ology tectonics and structural geology section that are also related to.
Sandra Barr: gc CP 683 and should really have been part of this session, they are the first two talks at 230 Nova Scotia time I guess that's 1:30am Eastern time.
Sandra Barr: And again at 150.
Sandra Barr: Okay, about over to you.
Yvette D Kuiper: Okay, so we were going to have a few minutes for general discussion, which will have to be really sure that I just got a note that this session has to end in two minutes so that's what we'll do.
Yvette D Kuiper: I think.
Yvette D Kuiper: Rather than general discussion i'll just thank you for your contributions, I do hope that we can do this live against one time, which is a little simpler in my mind and.
Yvette D Kuiper: The remote thing, but I thought this was really nice to see all and learn about your research and i'm looking forward to working together more through the I just see people are jerks and beyond, and.
Yvette D Kuiper: that's all I have to say I think I don't know if anyone has anything else to add any other leaders.
Maryann Malinconico: i'm gail Ashley is in charge of technical sessions for next year and is looking for people to volunteer to organize a session it's in Lancaster Pennsylvania and everybody's hoping it will be in person.
Yvette D Kuiper: will be there.
Yvette D Kuiper: Stay tuned.
Hal Bosbyshell: What are the dates for next year.
Maryann Malinconico: In New.
Sandra Barr: The 22nd of March 22 is certainly one of them I happened to look that up.
Sandra Barr: I don't know if it's 22nd 23rd or.
Sandra Barr: What but.
faouziya haissen: event.
faouziya haissen: And I just want to say that i'm happy to say basis, because I have many I know many names in the project but it's the first day I say that the person.
faouziya haissen: happy.
faouziya haissen: Many names look at them and.
faouziya haissen: seeing their faces, for the first time I hope it will be, it will be the first time, but not the last time.
That.
faouziya haissen: Our our field trips and our meetings.
Yvette D Kuiper: I look forward to that too, but it's actually not so nice thing about having this meeting me mode, because otherwise half of you would not have been there and it's actually Nice that we can do this together.
faouziya haissen: yeah exactly yeah.
Yvette D Kuiper: So I think I don't know if the session will automatically and butter in one minutes, the session may explode.
Yvette D Kuiper: I hope to see you on the afternoon and there thanks once again good to.
Sandra Barr: lunch break exactly right.
Sa?d Belkacim: Thanks everybody.
Yvette D Kuiper: It didn't explode.