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Cordilleran Section (104th Annual) and Rocky Mountain Section (60th Annual) Joint Meeting (19–21 March 2008)

Session No. 7
Wednesday, 19 March 2008: 1:30 PM-5:40 PM

T2. Causes and Consequences of Laramide Tectonics in the Forearc, Arc, and Backarc of the Southwestern United States

 

Michael L. Wells, Carl E. Jacobson and Andrew Barth, Advocates
Paper #
Start Time
 
1:30 PM
Introductory Remarks
1
1:40 PM
MAGMATIC EVOLUTION IN THE BIG BEAR LAKE INTRUSIVE SUITE, SAN BERNARDINO MOUNTAINS, CALIFORNIA: CORDILLERAN LITHOSPHERE DYNAMICS RECORDED IN PROVENANCE OF BATHOLITH MAGMAS?
BARTH, Andrew P., Earth Sciences, Indiana University~Purdue University Indianapolis, Indianapolis, IN 46202, WOODEN, J.L., U.S. Geological Survey, Menlo Park, CA 94025 and MAZDAB, F.K., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, ibsz100@iupui.edu, ibsz100@iupui.edu
2
2:00 PM
IMPLICATIONS OF THE PELONA-OROCOPIA-RAND SCHISTS FOR EVOLUTION OF THE NACIMIENTO FAULT, CALIFORNIA
JACOBSON, Carl E., Geological and Atmospheric Sciences, Iowa State University, 253 Science I, Ames, IA 50011-3212, GROVE, Marty, Earth and Space Sciences, UCLA, Los Angeles, CA 90095, PEDRICK, Jane N., Dept of Geological & Atmospheric Sciences, Iowa State Univ, Ames, IA 50011-3212, BARTH, Andrew, Earth Science, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, GEHRELS, G.E., Department of Geosciences, University of Arizona, Gould-Simpson Building #77, 1040 E 4th St, Tucson, AZ 85721 and NOURSE, Jonathan A., Geological Sciences Department, Cal Poly Pomona University, Pomona, CA 91768, cejac@iastate.edu, cejac@iastate.edu
3
2:20 PM
MICROSTRUCTURAL ANALYSIS OF DEFORMATION AND METAMORPHISM ALONG THE VINCENT THRUST IN THE EASTERN SAN GABRIEL MOUNTAINS, CALIFORNIA
BEHR, Whitney M.1, ALPERT, Lisa A.1, ECONOMOS, Rita2, JOHANESEN, Katharine1, PLATT, John P.1 and ZHANG, Tao1, (1)Department of Earth Sciences, University of Southern California, 3651 Trousdale Parkway, Los Angeles, CA 90089, (2)Department of Earth Sciences, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, behr@usc.edu, behr@usc.edu
4
2:40 PM
A 2D KINEMATIC-THERMAL MODEL OF FLAT SUBDUCTION INITIATION AND ACCRETION OF THE PELONA AND RELATED SCHISTS OF SOUTHERN CALIFORNIA
KIDDER, Steven, Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd, MC 100-23, Los Angeles, CA 91125, HERMAN, Frédéric, ETH, Geologisches Institut HAD G 4, Haldenbachstr. 44, Zurich, 8092, Switzerland, SALEEBY, Jason B., Geological & Planetary Sciences, California Institute of Technology, 1200 E. California Blvd., MC 100-23, Pasadena, CA 91125, AVOUAC, Jean-Philippe, Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125 and DUCEA, Mihai N., Department of Geosciences, University of Arizona, Gould-Simpson Bldg, Tucson, AZ 85721-0077, kidder@gps.caltech.edu, kidder@gps.caltech.edu
5
3:00 PM
RAPID EXHUMATION OF THE RAND SCHIST: CORROBORATIVE EVIDENCE FROM GARNET-BASED GEOSPEEDOMETRY, THERMOCHRONOMETRY, AND FIELD STUDIES
CHAPMAN, Alan D., Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd, MC 100-23, Pasadena, CA 91125, SALEEBY, Jason B., Geological & Planetary Sciences, California Institute of Technology, 1200 E. California Blvd., MC 100-23, Pasadena, CA 91125 and LUFFI, Peter I., Department of Earth Science, Rice University, 6100 Main St, Houston, TX 77005, alan@gps.caltech.edu, alan@gps.caltech.edu
 
3:20 PM
Break
6
3:40 PM
WAS THE LARAMIDE OROGENY AN EXTENSIONAL EVENT? EVIDENCE FOR EARLY TERTIARY EXTENSIONAL UNROOFING OF SOME OF THE CORDILLERAN METAMORPHIC CORE COMPLEXES
GANS, Phillip B., Department of Earth Science, University of California, Santa Barbara, Santa Barbara, CA 93106-9630 and WONG, Martin, Geology, Colgate University, Hamilton, NY 13346, gans@geol.ucsb.edu, gans@geol.ucsb.edu
7
4:00 PM
TECTONIC IMPLICATIONS OF LATE CRETACEOUS EXTENSION AND GRANITE PRODUCTION IN THE MOJAVE DESERT REGION: DELAMINATION OF MANTLE LITHOSPHERE AT THE ONSET OF THE LARAMIDE OROGENY?
WELLS, Michael L., Dept. of Geoscience, Univ of Nevada, Las Vegas, 4505 South Maryland Parkway, Las Vegas, NV 89154-4010, michael.wells@unlv.edu, michael.wells@unlv.edu
8
4:20 PM
CABORCAN PROTEROZOIC BASEMENT IN THE RANCHO LA LAMINA REGION, SONORA, MEXICO: U-PB AGES, ND ISOTOPIC COMPOSITION, 40AR/39AR THERMOCHRONOLOGY, AND CLAST PROVENANCE INDICATE PRE-EARLY JURASSIC ARRIVAL AND LARAMIDE EXHUMATION
AMATO, Jeffrey M.1, LAWTON, Timothy2, LEGGETT, William2, MAUEL, David2, GONZÁLEZ-LEÓN, Carlos M.3, HEIZLER, Matthew4 and FARMER, G. Lang5, (1)Geological Sciences, New Mexico State University, P.O. Box 30001/MSC 3AB, Las Cruces, NM 88003, (2)Geological Sciences, New Mexico State Univ, MSC 3AB, PO Box 30001, Las Cruces, NM 88003, (3)Instituto de Geología, UNAM, Estación Regional del Noroeste, Apartado Postal 1039, Hermosillo, Sonora, 83000, Mexico, (4)New Mexico Geochronology Research Laboratory, New Mexico Bureau of Mines & Mineral Resources, 801 Leroy Place, New Mexico Tech, Socorro, NM 87801-4796, (5)Geological Sciences, University of Colorado, Boulder, CO 80309, amato@nmsu.edu, amato@nmsu.edu
9
4:40 PM
BURIED CANYONS: END-LARAMIDE PALEOTOPOGRAPHY OF NORTHEASTERN NEVADA PRESERVED BENEATH EOCENE TO MIOCENE VOLCANIC SEQUENCES
MCGREW, Allen and VANCE, Joshua, Department of Geology, The Univ of Dayton, 300 College Park, Dayton, OH 45469-2364, Allen.McGrew@notes.udayton.edu, Allen.McGrew@notes.udayton.edu
10
5:00 PM
MODERATE (1600 KM) NORTHWARD TRANSLATION OF BAJA BRITISH COLUMBIA FROM SOUTHERN CALIFORNIA: AN ATTEMPT AT RECONCILIATION OF PALEOMAGNETISM AND THE RELATION OF BAJA BC TO THE LARAMIDE
UMHOEFER, Paul J. and BLAKEY, Ronald, Geology, Northern Arizona University, Box 4099, Flagstaff, AZ 86011, paul.umhoefer@nau.edu, paul.umhoefer@nau.edu
 
5:20 PM
Concluding Remarks
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