GSA Annual Meeting in Seattle, Washington, USA - 2017

Session No. 321
Wednesday, 25 October 2017: 8:00 AM-12:00 PM
Tahoma 4 (The Conference Center)

T229. Paleocene-Eocene Tectonic and Magmatic Evolution of the Pacific Northwest

GSA Structural Geology and Tectonics Division; GSA Sedimentary Geology Division; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division
Jeffrey H. Tepper, Eugene D. Humphreys and Robert B. Miller, Advocates
8:00 AM
EVIDENCE FOR THE SILETZIA TERRANE'S ORIGIN AS A RIDGE-CENTERED OCEANIC PLATEAU
EDDY, Michael P., Department of Geosciences, Princeton University, Princeton, NJ 08544, meddy@princeton.edu
8:15 AM
SILETZIA, YELLOWSTONE, AND THE FARALLON PLATE BENEATH NORTH AMERICA (Invited Presentation)
WELLS, Ray E., U.S. Geological Survey, 2130 SW 5th Ave., Portland, OR 97201, BLAKELY, Richard J., GMEG Menlo Park, U.S. Geological Survey, 345 Middlefield Rd, MS 989, Menlo Park, CA 94025 and ANDERSON, Megan, Geology Department, Colorado College, 14 E. Cache La Poudre St, Colorado Springs, CO 80903, rwells@usgs.gov
8:35 AM
LIFE AND DEATH OF THE RESURRECTION PLATE: STILL THE MOST COMPELLING EXPLANATION FOR COEVAL FOREARC MAGMATISM IN THE PACIFIC NORTHWEST AND ALASKA
HAEUSSLER, Peter J., U.S. Geological Survey, 4210 University Dr, Anchorage, AK 99508, BRADLEY, Dwight C., U.S. Geological Survey, 11 Cold Brook Rd, Randolph, NH 03593, WELLS, Ray E., GMEG at Oregon Water Science Center, US Geological Survey, 2130 SW 5th Ave., Portland, OR 97201, MILLER, Marti L., U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667 and KARL, Susan M., U.S. Geological Survey, 4210 University Dr, Anchorage, AK 99508-4626, pheuslr@usgs.gov
8:50 AM
ACCRETING SILETZIA: REGIONAL MAGMATIC AND TECTONIC CONSEQUENCES
HUMPHREYS, Eugene D., Earth Sciences, University of Oregon, Eugene, OR 97403, genehumphreys@gmail.com
9:05 AM
CENOZOIC EXTENSION OF THE NORTH AMERICAN CORDILLERA: NEW INSIGHT ON METAMORPHIC CORE COMPLEXES (Invited Presentation)
TEYSSIER, Christian1, WHITNEY, Donna L.1 and REY, Patrice F.2, (1)Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, (2)Earthbyte Research Group, School of Geosciences, University of Sydney, Sydney, NSW2006, Australia, dwhitney@umn.edu
9:20 AM
EOCENE TRANSTENSION AND STRAIN PATTERNS FROM DIKE SWARMS AND STRIKE-SLIP FAULTS IN THE WASHINGTON CASCADES
MILLER, Robert B.1, BRYANT, Katheriine2, DORAN, Brigid3, EDDY, Michael P.4, SYLVA, Nick3, RAVIOLA, Frank3 and UMHOEFER, Paul J.5, (1)Geology, San Jose State University, One Washington Square, San Jose, CA 95192, (2)Geology, San Jose State University, San Jose, CA 95020, (3)Geology, San Jose State University, San Jose, CA 95192-0102, (4)Department of Geosciences, Princeton University, Princeton, NJ 08544, (5)School of Earth Sciences and Environmental Sustainability, Northern Arizona University, 625 Knoles Drive, Box 4099, Flagstaff, AZ 86011, robert.b.miller@sjsu.edu
9:35 AM
EO-/OLIGOCENE CASCADE TOPOGRAPHY REVEALED BY THE CLUMPED (Δ47) AND OXYGEN ISOTOPE (δ18O) RECORD OF THE CHUMSTICK BASIN (WA, USA)
METHNER, Katharina, Senckenberg Biodiversity and Climate Research Centre, Senckenberg Gesellschaft für Naturforschung, Senckenberganlage 25, Frankfurt am Main, 60325, Germany, FIEBIG, Jens, Institut für Geowissenschaften, J. W. Goethe-Universität, Altenhöferallee 1, Frankfurt, 60438, Germany, WACKER, Ulrike, Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, 04103, Germany, UMHOEFER, Paul J., School of Earth Sciences and Environmental Sustainability, Northern Arizona University, 625 Knoles Drive, Box 4099, Flagstaff, AZ 86011, CHAMBERLAIN, C. Page, Department of Earth System Science, Stanford University, 473 Via Ortega, Rm 140, Stanford, CA 94305 and MULCH, Andreas, Senckenberg, Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, Frankfurt am Main, 60325, Germany, katharina.methner@senckenberg.de
 
9:50 AM
Break
10:05 AM
AN INTEGRATED TECTONIC AND MAGMATIC HISTORY OF THE INTERIOR REGION OF THE PACIFIC NORTHWEST: THE SIGNIFICANCE OF SYRINGA EMBAYMENT (Invited Presentation)
TIKOFF, Basil1, KAHN, Maureen1, FAYON, Annia2, SCHMIDT, Keegan L.3, KELSO, Paul4, GASCHNIG, Richard5, VERVOORT, Jeffrey6 and HOLE, John A.7, (1)Department of Geoscience, University of Wisconsin-Madison, 1215 W Dayton St, Madison, WI 53706, (2)Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, (3)Division of Natural Science, Lewis - Clark State College, Lewiston, ID 83501, (4)Department of Geology and Physics, Lake Superior State University, 650 W. Easterday Ave, Sault Ste. Marie, MI 49783, (5)Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts Lowell, Lowell, MA 01854, (6)School of the Environment, Washington State University, Webster Physical Science Building 1228, Pullman, WA 99164, (7)Geosciences, Virginia Tech, Blacksburg, VA 24061, basil@geology.wisc.edu
10:25 AM
LATEST CRETACEOUS AND PALEOGENE COOLING HISTORY FROM APATITE AND ZIRCON (U-TH)/HE IN THE SYRINGA EMBAYMENT, WESTERN IDAHO
KAHN, Maureen, Department of Geoscience, University of Wisconsin - Madison, 1215 W. Dayton St, Madison, WI 53706, FAYON, Annia, Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455 and TIKOFF, Basil, Department of Geoscience, University of Wisconsin-Madison, 1215 W Dayton St, Madison, WI 53706, maureenkahn@gmail.com
10:40 AM
THE CORDILLERAN OROGEN IN THE EOCENE: TOPOGRAPHY, DRAINAGE SYSTEMS, AND TECTONIC IMPLICATIONS
CASSEL, Elizabeth J.1, SMITH, M. Elliot2, ADAMS, Alexandra C.1 and JICHA, Brian R.3, (1)Geological Sciences, University of Idaho, 875 Perimeter Drive MS 3022, Moscow, ID 83844, (2)School of Earth Sciences and Environmental Sustainability, Northern Arizona University, 625 Knoles Drive, Box 4099, Flagstaff, AZ 86011, (3)Department of Geoscience, University of Wisconsin-Madison, 1215 W. Dayton St, Madison, WI 53706, ecassel@uidaho.edu
10:55 AM
THE CAUSE(S) OF WIDESPREAD EOCENE MAGMATISM IN THE PACIFIC NORTHWEST: INSIGHTS FROM GEOCHEMISTRY AND GEOCHRONOLOGY OF IGNEOUS ROCKS IN WASHINGTON
TEPPER, Jeffrey H., Department of Geology, University of Puget Sound, Tacoma, WA 98416 and EDDY, Michael P., Department of Geosciences, Princeton University, Princeton, NJ 08544, jtepper@pugetsound.edu
11:10 AM
THE CHALLIS MAGMATIC PROVINCE IN IDAHO: A REVIEW
GASCHNIG, Richard, Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts Lowell, 1 University Dr, Lowell, MA 01854, VERVOORT, Jeffrey, School of the Environment, Washington State University, Webster Physical Science Building 1228, Pullman, WA 99164 and LEWIS, Reed S., Idaho Geological Survey, 875 Perimeter Dr MS3014, Moscow, ID 83844-3014, richard_gaschnig@uml.edu
11:25 AM
EOCENE IGNIMBRITE FLARE-UP IN THE NORTHEASTERN U.S. CORDILLERA: TIMING AND STYLE OF VOLCANISM IN THE LOWLAND CREEK VOLCANIC FIELD OF SOUTHWESTERN MONTANA
SCARBERRY, Kaleb C., Montana Bureau of Mines and Geology, Montana Tech University, 1300 W Park Street, Butte, MT 59701, kscarberry@mtech.edu
 
11:40 AM
Discussion
See more of: Technical Sessions