Session: Melt Microstructures: Evidence for the Presence of Melt and Consequences for Deforming Continental Crust (2009 Portland GSA Annual Meeting (18-21 October 2009))

Session No. 63

Sunday, 18 October 2009: 1:30 PM-5:30 PM

A105 (Oregon Convention Center)

T73. Melt Microstructures: Evidence for the Presence of Melt and Consequences for Deforming Continental Crust

GSA Structural Geology and Tectonics Division

Jamie Levine and Christine S. Siddoway, Advocates

Paper #

Start Time

1:30 PM

Introductory Remarks

1:35 PM

PORE SIZE AS A DETERMINANT FOR SOLIDIFICATION MICROSTRUCTURES

HOLNESS, Marian B., Dept. Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom, marian@esc.cam.ac.uk, marian@esc.cam.ac.uk

1:55 PM

EVOLUTION OF MICROSTRUCTURE AND MELT TOPOLOGY IN PARTIALLY MOLTEN GRANITIC MYLONITE: IMPLICATION ON THE RHEOLOGY OF PARTIALLY MOLTEN LOWER CRUST

SCHULMANN, Karel, Eost, Université de Strasbourg, 1 rue Blessig, Strasbourg, 67000, Schulman@illite.u-strasbg.fr, Schulman@illite.u-strasbg.fr

2:15 PM

THERMAL FEEDBACKS BETWEEN STRAIN HEATING AND MELT PRODUCTION IN OROGENIC BELTS

WHITTINGTON, Alan, Department of Geological Sciences, University of Missouri, Columbia, MO 65211, HOFMEISTER, Anne, Department of Earth and Planetary Sciences, Washington University, Campus Box 1169, St. Louis, MO 63130 and NABELEK, Peter, Geological Sciences, Univ of Missouri-Columbia, 101 Geological Sciences Bldg, Columbia, MO 65211, whittingtona@missouri.edu, whittingtona@missouri.edu

2:30 PM

Discussion

2:45 PM

PARTIAL MELTING DURING MID- TO LOWER-CRUSTAL DEFORMATION: “IN SITU” MELTS, MELT CHANNEL-WAYS, AND TEMPORAL EVOLUTION OF MELT CHEMISTRY

BARQUERO-MOLINA, Miriam, Department of Geological Sciences, University of Missouri, 101 Geological Sciences Building, Columbia, MO 65211, LEVINE, Jamie S.F., Dept of Geology, Appalachian State University, Boone, NC 28608 and MOSHER, Sharon, Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, Austin, TX 78712-0254, barqueromolinam@missouri.edu, barqueromolinam@missouri.edu

3:00 PM

“NANOGRANITE” INCLUSIONS IN PERITECTIC MINERALS: FINDING THE ANATECTIC MELT IN MIGMATITES AND GRANULITES

CESARE, Bernardo¹, FERRERO, Silvio², BARTOLI, Omar³, BRAGA, Roberto⁴, SALVIOLI-MARIANI, Emma³, ACOSTA-VIGIL, Antonio⁵ and MELI, Sandro³, (1)Department of Geosciences, University of Padua, Padova, 35131, Italy, (2)Institut für Erd- und Umweltwissenschaften, Universität Potsdam, Potsdam, 14476, Germany, (3)Earth Sciences Department, University of Parma, Parma, 43100, Italy, (4)Dipartimento di Scienze della Terra e Geologico-Ambientali, University of Bologna, Bologna, 401126, Italy, (5)Instituto Andaluz de Ciencias de la Tierra, CSIC, Granada, 18002, Spain, bernardo.cesare@unipd.it, bernardo.cesare@unipd.it

3:20 PM

GENERATION AND CONTAMINATION OF GRANITIC MAGMA IN THE DEEP CRUST, ATHABASCA GRANULITE TERRANE, SASKATCHEWAN

KOTEAS, G. Christopher¹, WILLIAMS, Michael L.² and SEAMAN, Sheila J.², (1)Earth and Environmental Sciences, Norwich University, 158 Harmon Drive, Northfield, VT 05663, (2)Department of Geosciences, University of Massachusetts, 611 North Pleasant Street, 233 Morrill Science Center, Amherst, MA 01003, gkoteas@norwich.edu, gkoteas@norwich.edu

3:35 PM

Break

3:50 PM

Panel Discussion

4:10 PM

MELT MICROSTRUCTURES PROVIDE EVIDENCE FOR PERVASIVE PARTIAL MELTING WITHIN SHEAR ZONES AND SURROUNDING COUNTRY ROCK

LEVINE, Jamie S.F., Dept of Geology, Appalachian State University, Boone, NC 28608 and MOSHER, Sharon, Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, Austin, TX 78712-0254, levinejs@appstate.edu, levinejs@appstate.edu

4:25 PM

RHEOLOGICAL TRANSITION DURING SYN-TECTONIC PARTIAL MELTING AND CRYSTALLIZATION OF METAPELITES: AN EXPERIMENTAL STUDY

MISRA, Santanu¹, BURLINI, Luigi² and BURG, Jean-Pierre², (1)Geological Institute, ETH Zurich, NO E, Sonneggstrasse 5, Zurich, CH-8092, Switzerland, (2)Geological Institute, ETH Zurich, NO E, Sonneggstrasse 5, Zurich, CH-8092, santanu.misra@erdw.ethz.ch, santanu.misra@erdw.ethz.ch

4:40 PM

WIDESPREAD OCCURRENCES OF HöGBOMITE (2N2S) IN UHT METAPELITES FROM THE BETROKA BELT, SOUTHERN MADAGASCAR: IMPLICATIONS ON MELT/FLUID ACTIVITY DURING REGIONAL METAMORPHISM

RAKOTONANDRASANA, Nirihaja Othon Thierry¹, ARIMA, Makoto¹, MIYAWAKI, Ritsuro² and RAMBELOSON, Roger Andriamampianina³, (1)Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan, (2)Department of Geology, National Science Museum, 3-23-1, Hyakunin-cho, Shinjuku, Tokyo, 169-0073, Japan, (3)Département des Sciences de la Terre, Faculté des Sciences, Université d'Antananarivo, PB 906, Antananarivo, 101, Madagascar, rakoto_thierry@yahoo.fr, rakoto_thierry@yahoo.fr

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