2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM

Session No. 130
Sunday, 5 October 2008: 8:00 AM-12:00 PM

T75. Modes of Lithospheric Extension: Oceanic and Continental Core Complexes

GSA Structural Geology and Tectonics Division; GSA Geophysics Division; GSA International Division


Yildirim Dilek and Elena A. Miranda, Advocates
Paper #
Start Time
8:00 AM
Mapping the Lower Ocean Crust: Evidence for Variable Melt Production and Mantle Composition during Normal Seafloor Spreading
DICK, Henry J.B., Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, hdick@whoi.edu, hdick@whoi.edu
8:15 AM
Seismic Evidence for Large-Scale Compositional Heterogeneity of Oceanic Core Complexes
CANALES, Juan Pablo1, TUCHOLKE, Brian E.1 and XU, Min2, (1)Geology and Geophysics, Woods Hole Oceanographic Institution, 360 Woods Hole Rd, Woods Hole, MA 02543, (2)Geology and Geophysics, Woods HOle Oceanographic Institution, 360 Woods Hole Rd, Woods Hole, MA 02543, jpcanales@whoi.edu, jpcanales@whoi.edu
8:30 AM
Non-Volcanic Seafloor Spreading and Oceanic Core Complexes: You Can Have One without the Other
SCHROEDER, Timothy1, JÖNS, Niels2, CHEADLE, Michael3 and BACH, Wolfgang2, (1)Natural Sciences, Bennington College, 1 College Drive, Bennington, VT 05201, (2)Department 5 Geosciences, University of Bremen, Klagenfurter Straße, GEO-Building, Postfach 330 440, Bremen, 28334, Germany, (3)Geology and Geophysics, University of Wyoming, Laramie, WY 82071, tschroeder@bennington.edu, tschroeder@bennington.edu
8:45 AM
Extensive Core Complex Formation in a Magma Starved Segment of the the Mid-Atlantic Ridge Between 12°-16°n: Strain Softening and a Coupled Crust-Mantle Rheology
CASEY, John F., Department of Geosciences, University of Houston, Houston, TX 77204, SEARLE, Roger C., Department of Earth Sciences, Durham University, DH1 3LE, UK, NA, Duhram, United Kingdom, MACLEOD, Christopher, School of Earth and Ocean Sciences, Cardiff University, Main Building, Cardiff University, Park Place, Cardiff, CF10 3Ye, United Kingdom and MURTON, Bramley J., Southampton Oceanography Centre, Southampton, SO14 3ZH, United Kingdom, jfcasey@uh.edu, jfcasey@uh.edu
9:00 AM
9:15 AM
The Geometry and Mechanics of Active Oceanic Detachment Faulting from An Ocean-Bottom Seismicity Survey at the TAG Segment of the Mid-Atlantic Ridge (26°N)
DEMARTIN, Brian J., Department of Geological Sciences, Brown University, Box 1846, Providence, RI 02912-1846 and REVES-SOHN, Robert, Geology and Geophysics, Woods Hole Oceanographic Institution, Mail Stop 24, Woods Hole, MA 02543, Brian_deMartin@brown.edu, Brian_deMartin@brown.edu
9:30 AM
Pluton Emplacement Kinematics and Arc Collapse during Extensional Tectonics
DEPINE, Gabriela V. and ANDRONICOS, Chris, Earth and Atmospheric Sciences, Cornell University, Snee Hall, Ithaca, NY 14853, gvd2@cornell.edu, gvd2@cornell.edu
9:45 AM
10:00 AM
Insights on Metamorphic Core Complex Formation from the Sierra Mazatán Case Study
WONG, Martin S., Geology Department, Colgate University, 13 Oak Drive, Hamilton, NY 13346 and GANS, Phillip B., Department of Earth Science, University of California, Santa Barbara, Santa Barbara, CA 93106-9630, mswong@colgate.edu, mswong@colgate.edu
10:15 AM
Core Complexes Are Tectonic Windows of Opportunity: A Microstructural Evaluation of Shear Zone Rheology and Strain Localization in the South Mountains Core Complex, Arizona
MIRANDA, Elena A. and CARTER, James S., Department of Geological Sciences, California State University Northridge, 18111 Nordhoff Street, Northridge, CA 91330-8266, elena.miranda@csun.edu, elena.miranda@csun.edu
10:30 AM
Rheologically Driven Strain Partitioning in the Footwall Shear Zone of a Metamorphic Core Complex, Raft River Mountains, Utah
SULLIVAN, Walter A., Department of Geology, Colby College, 5800 Mayflower Hill, Waterville, ME 04901, wasulliv@colby.edu, wasulliv@colby.edu
10:45 AM
Shallow Initial Dip for the Northern Snake Range Footwall: Constraints from Geothermobarometry
COOPER, Frances J., Department of Earth Sciences, University of Southern California, 3651 Trousdale Parkway, Los Angeles, CA 90089-0740 and PLATT, John P., Department of Earth Sciences, Univ of Southern California, 3651 Trousdale Parkway, Zumberge Hall 117, Los Angeles, CA 90089-074, fcooper@usc.edu, fcooper@usc.edu
11:00 AM
Exhumation of the Trans-Himalayan Ama Drime Massif: Implications for Orogen-Parallel Mid-Crustal Flow and Exhumation on the Southern Margin of the Tibetan Plateau
JESSUP, Micah1, COTTLE, John2, NEWELL, Dennis3, BERGER, Aaron4 and SPOTILA, James4, (1)Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, (2)NERC Isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth, Nottingham, NG12 5GG, (3)Hydrology, Geochemistry and Geology Group, Los Alamos National Laboratory, Los Alamos, NM 87545, (4)Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, VA 24060, mjessup@utk.edu, mjessup@utk.edu
11:15 AM
The Geomorphic Response of An Active Metamorphic Core-Complex: An Example from the Lunggar Rift, Southern Tibet
TAYLOR, Michael, Department of Geology, University of Kansas, 1475 Jayhawk Blvd, Lawrence, KS 66045, KAPP, Paul, Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721 and STOCKLI, Daniel F., Department of Geology, University of Kansas, Lawrence, 66045, mht@ku.edu, mht@ku.edu
11:30 AM
Extension in Granulite Facies Orthogneisses of the Biranup Complex (Albany-Fraser Orogen), Bremer Bay, Western Australia
BARQUERO-MOLINA, Miriam, Department of Geological Sciences, University of Missouri, 101 Geological Sciences Building, Columbia, MO 65211, MOSHER, Sharon, Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, Austin, TX 78712-0254, SPAGGIARI, Catherine, Geological Survey of Western Australia, 100 Plain Street, East Perth, Perth, WA, 6004, Australia and BODORKOS, Simon, Onshore Energy and Minerals Division, Geoscience Australia, GPO Box 378, Canberra ACT, 2601, Australia, Simon.Bodorkos@ga.gov.au, Simon.Bodorkos@ga.gov.au
11:45 AM
The Northeastern Emplacement of the Pindos Basin Ophiolites and Their Response to Pelagonian Exhumation Tectonics (Northern Greece)
RASSIOS, Anne Ewing, Kozani Branch, Institute of Geology and Mineral Exploration, Lefkovrisi, Kozani, 50100, Greece, DILEK, Yildirim, Dept of Geology, Miami University, Oxford, OH 45056 and KOSTOPOULOS, Dimitri, Geology, University of Athens, Ilisia, Athens, 15701, Greece, blather@gre.forthnet.gr, blather@gre.forthnet.gr
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