2009 Portland GSA Annual Meeting (18-21 October 2009)

Session No. 231
Wednesday, 21 October 2009: 8:00 AM-12:00 PM
A107/108/109 (Oregon Convention Center)

T50. New Developments in Understanding the Mesozoic Cordilleran Orogen: Linking Forearc, Arc, and Backarc Processes

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

 

Michael Wells and Mihai N. Ducea, Advocates
Paper #
Start Time
1
8:00 AM
CYCLIC BEHAVIOR IN CORDILLERAN OROGENIC SYSTEMS
DECELLES, Peter1, DUCEA, Mihai N.2, ZANDT, George1, KAPP, Paul2, GRAHAM, Stephan A.3, CARRAPA, Barbara4, PELLETIER, Jon1, KENDALL, Jerry5, GEHRELS, G.E.1 and PEARSON, David6, (1)Department of Geosciences, University of Arizona, Tucson, AZ 85721, (2)Department of Geosciences, University of Arizona, 1040 E 4th St, Tucson, AZ 85721, (3)Geological and Evironmental Sciences, Stanford University, 450 Serra Mall, Braun Hall, Stanford, CA 94305, (4)Department of Geology & Geophysics, University of Wyoming, 1000 East University Avenue, Laramie, WY 82071-3006, (5)ExxonMobil Exploration, 233 Benmar, Houston, TX 77060, (6)Geosciences, Idaho State University, 921 S. 8th Ave, STOP 8072, Pocatello, ID 83209, decelles@email.arizona.edu, decelles@email.arizona.edu
2
8:20 AM
DETERMINING THE 3-D KINEMATIC HISTORY OF THE WYOMING LARAMIDE FORELAND: PRELIMINARY RESULTS FROM DETAILED STRUCTURAL ANALYSIS OF THE TRIASSIC CHUGWATER GROUP
YONKEE, Adolph1, WEIL, Arlo2, WICKS, David2 and STATMAN-WEIL, Zoe3, (1)Department of Geosciences, Weber State University, 2507 University Circle, Ogden, UT 84408, (2)Department of Geology, Bryn Mawr College, Bryn Mawr, PA 19010, (3)Department of Geology, Carleton College, Mudd Hall, Carleton College, Northfield, MN 55057, ayonkee@weber.edu, ayonkee@weber.edu
3
8:35 AM
JURASSIC OROGENESIS IN NW NEVADA: TIMING, KINEMATICS AND RELATION (IF ANY?) TO THE SEVIER OROGENY
WYLD, Sandra J. and WRIGHT, James E., Dept. of Geology, University of Georgia, Athens, GA 30602, swyld@gly.uga.edu, swyld@gly.uga.edu
4
8:55 AM
GEODYNAMICS OF SYNCONVERGENT EXTENSION AND TECTONIC MODE SWITCHING: CONSTRAINTS FROM THE SEVIER-LARAMIDE OROGEN
WELLS, Michael L.1, HOISCH, Thomas D.2, CRUZ-URIBE, Alicia M.2 and VERVOORT, Jeff3, (1)Dept. of Geoscience, Univ of Nevada, Las Vegas, 4505 South Maryland Parkway, Las Vegas, NV 89154-4010, (2)Department of Geology, Northern Arizona University, Box 4099, Flagstaff, AZ 86011, (3)School of the Environment, Washington State University, Pullman, WA 99164, michael.wells@unlv.edu, michael.wells@unlv.edu
5
9:10 AM
LATE CRETACEOUS–EARLY TERTIARY EXTENSION IN THE CENTRAL MOJAVE METAMORPHIC CORE COMPLEX: IMPLICATIONS FOR CORE COMPLEX FORMATION AND THE LARAMIDE OROGENY
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
6
9:25 AM
A COLLISIONAL ORIGIN FOR THE GREAT CORDILLERAN BATHOLITHS OF WESTERN NORTH AMERICA
HILDEBRAND, Robert S., Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721-0077, hbrand@mail.arizona.edu, hbrand@mail.arizona.edu
7
9:40 AM
CRUSTAL GROWTH AND RECYCLING AND LINKS TO TECTONISM IN THE IDAHO BATHOLITH AND CHALLIS INTRUSIVE PROVINCE
GASCHNIG, Richard M., Department of Geology, University of Maryland, College Park, MD 20742, VERVOORT, Jeffery D., School of the Environment, Washington State University, Pullman, WA 99164 and LEWIS, Reed S., Idaho Geological Survey, University of Idaho, 875 Perimeter Drive MS3014, Moscow, ID 83844-3014, gaschnig@umd.edu, gaschnig@umd.edu
 
9:55 AM
Break
8
10:10 AM
MESOZOIC CORDILLERAN TECTONICS: PRE-FRANCISCAN SUBDUCTION INITIATION AND TERMINATION EVENTS, AND EPISODIC PROCESSES DURING CONTINUOUS FRANCISCAN SUBDUCTION
WAKABAYASHI, John, Department of Earth and Environmental Sciences, California State University, Fresno, CA 93740, jwakabayashi@csufresno.edu, jwakabayashi@csufresno.edu
9
10:30 AM
CONSTRAINING P-T HISTORY OF DEEP LITHOSPHERE BENEATH CONTINENTAL ARCS USING MANTLE XENOLITHS – A CASE STUDY FROM THE SIERRA NEVADA, CALIFORNIA
CHIN, Emily J.1, LUFFI, Peter2 and LEE, Cin-Ty2, (1)Earth Science, Rice University, 6100 Main Street, MS 126, Houston, TX 77005, (2)Earth Science, Rice Univ, MS 126, 6100 Main St, Houston, TX 77005, ejc5@rice.edu, ejc5@rice.edu
10
10:45 AM
TECTONIC UNDERPLATING OF TRENCH SEDIMENTS BENEATH MAGMATIC ARCS - THE LARAMIDE EXAMPLE IN THE WESTERN U.S.A
DUCEA, Mihai N., Department of Geosciences, University of Arizona, 1040 E 4th St, Tucson, AZ 85721, KIDDER, Steven, Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd, MC 100-23, Los Angeles, CA 91125 and SALEEBY, Jason B., Division of Geological and Planetary Sciences, California Institute Technology, Pasadena, CA 91125-0001, ducea@email.arizona.edu, ducea@email.arizona.edu
11
11:00 AM
ROLE OF EXTRUSION OF THE RAND AND SIERRA DE SALINAS SCHISTS IN LATE CRETACEOUS EXTENSION AND ROTATION OF THE SOUTHERN SIERRA NEVADA AND VICINITY
CHAPMAN, Alan D.1, KIDDER, Steven1, SALEEBY, Jason B.1 and DUCEA, Mihai N.2, (1)Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd, MC 100-23, Pasadena, CA 91125, (2)Department of Geosciences, University of Arizona, 1040 E 4th St, Tucson, AZ 85721, alan@gps.caltech.edu, alan@gps.caltech.edu
12
11:15 AM
MAFIC BLUESCHIST AND ASSOCIATED GRAPHITE-SCHIST BLOCKS IN THE FRANCISCAN MELANGE, SAN SIMEON, CALIFORNIA
UKAR, Estibalitz, Bureau of Economic Geology, University of Texas at Austin, Austin, TX 78713 and CLOOS, Mark, Department of Geological Sciences, University of Texas at Austin, Jackson School of Geosciences 1 University Station C9000, Austin, TX 78712, esti.ukar@beg.utexas.edu, esti.ukar@beg.utexas.edu
13
11:30 AM
168 MA GRANULITE FACIES METAMORPHISM AND 154 MA REFRIGERATION IN THE SEIAD METAOPHIOLITE COMPLEX, RATTLESNAKE CREEK TERRANE, KLAMATH MOUNTAINS
MEDARIS Jr, L.G.1, LAPEN, T.J.2, JICHA, Brian R.3, SINGER, B.S.1, GHENT, E.D.4 and GARLICK, S.R.5, (1)Geoscience, University of Wisconsin-Madison, Madison, WI 53706, (2)Geosciences, University of Houston, Houston, TX 77204-5007, (3)Department of Geoscience, University of Wisconsin-Madison, 1215 W. Dayton St, Madison, WI 53706, (4)Geology and Geophysics, University of Calgary, Calgary, AB T2N 1N4, (5)Geoscience Outreach Foundation, Intervale, NH 03845, medaris@geology.wisc.edu, medaris@geology.wisc.edu
14
11:45 AM
P–T–TECTONIC PATH IN METAMORPHIC ASSEMBLAGES ALONG A SUTURE IN THE NORTHERN KLAMATH MOUNTAINS, OREGON
KAYS, M. Allan, Department of Geological Sciences, University of Oregon, 1272 University of Oregon, Eugene, Oregon, OR 97403-1272 and MURRAY, Robert B., Eugene, Oregon, OR 97405, makays@uoregon.edu, makays@uoregon.edu
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