2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Session No. 280
Wednesday, 22 October 2014: 8:00 AM-12:00 PM
306 (Vancouver Convention Centre-West)

T122. Magmatism and Geodynamics within the Cascadia Subduction Zone

Cordilleran Section of the Geological Association of Canada; GSA Geophysics Division; Geochemical Society; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; GSA Structural Geology and Tectonics Division

 

S.M. DeBari, Patricia A. McCrory, A.J. Calvert and Nathalie Vigouroux, Advocates
Paper #
Start Time
280-1
8:00 AM
DYNAMICS OF THE PACIFIC NORTHWEST LITHOSPHERE AND ASTHENOSPHERE
HUMPHREYS, Eugene D., Geological Sciences, University of Oregon, Eugene, OR 97403
280-2
8:20 AM
RELATIONSHIP OF SUBDUCTION RATE AND SLAB-PULL IN THE CIRCUM-PACIFIC REALM SINCE 80MA
ROWLEY, David B., Department of the Geophysical Sciences, The University of Chicago, 5734 S. Ellis Avenue, Chicago, IL 60637, FORTE, Alessandro M., Geotop, Département des Sciences de la Terre et Atmosphère, Université du Québec à Montréal, CP 8888, succursale Centre-Ville, Montreal, QC H3C 3P8, Canada and GLISOVIC, Petar, Geotop, Département des Sciences de la Terre et de l'Atmosphère, Université du Québec à Montréal, CP 8888, succursale Centre-Ville, Montreal, QC H3C 3P8, Canada
280-3
8:35 AM
Withdrawn
280-4
8:50 AM
SEGMENTATION OF PLATE COUPLING, FATE OF SUBDUCTION FLUIDS, AND MODES OF ARC MAGMATISM IN CASCADIA, INFERRED FROM MAGNETOTELLURIC RESISTIVITY
WANNAMAKER, Philip E.1, EVANS, Rob L.2, BEDROSIAN, Paul A.3, UNSWORTH, Martyn4, MARIS, Virginie1 and MCGARY, R. Shane2, (1)Energy & Geoscience Institute, University of Utah, 423 Wakara Way, Suite 300, Salt Lake City, UT 84108, (2)Geology and Geophysics, Woods Hole Oceanographic Institution, Clark South 172, MS 24, Woods Hole, MA 02543, (3)Crustal Geophysics and Geochemistry Science Center, U.S. Geological Survey, Denver Federal Center, Bldg 20, MS 964, Denver, CO 80225, (4)Physics, University of Alberta, Edmonton, AB T6G 2J1, Canada
280-5
9:05 AM
TEMPERATURES AND THE ROLE OF WATER IN CASCADIA SUBDUCTION ZONE DEFORMATION AND MAGMATISM
PEACOCK, Simon M., Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, 2178-2207 Main Mall, Vancouver, BC V6T1Z4, Canada
280-6
9:25 AM
HELIUM AS A TRACER FOR FLUIDS RELEASED FROM JUAN DE FUCA LITHOSPHERE BENEATH THE CASCADIA FOREARC
MCCRORY, Patricia A.1, CONSTANTZ, James E.1, HUNT, Andrew G.2 and BLAIR, J. Luke1, (1)U.S. Geological Survey, Menlo Park, CA 94025, (2)U.S. Geological Survey, Denver Federal Center, Bldg. 21, MS-963, Denver, CO 80225
 
9:40 AM
Discussion
 
9:55 AM
Break
280-7
10:10 AM
MELTING REGIMES AND SUB-ARC MANTLE DOMAINS IN CASCADIA AS SEEN THROUGH PRIMITIVE BASALT COMPOSITIONS
GRUNDER, Anita L., College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, CEOAS Admin 104, Corvallis, OR 97331 and SCHMIDT, Mariek, Department of Earth Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada
280-8
10:30 AM
EXPLOSIVE FLARE-UP FOLLOWING THE LATE NEOGENE INITIATION OF THE CENTRAL OREGON HIGH CASCADE ARC
PITCHER, Bradley W., Ceoas, Oregon State University, 101 SW 26th St, Corvallis, OR 97333, KENT, Adam J.R., College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331 and GRUNDER, Anita L., College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, CEOAS Admin 104, Corvallis, OR 97331
280-9
10:45 AM
NEW INSIGHTS ON CASCADE ARC MANTLE HETEROGENEITY FROM BASALT GEOCHEMISTRY
MULLEN, Emily K., WEIS, Dominique, MARSH, Nicole B. and MARTINDALE, Marina, Earth, Ocean and Atmospheric Sciences, University of British Columbia, Pacific Centre for Isotopic and Geochemical Research, 2020-2207 Main Mall, Vancouver, BC V6T 1Z4, Canada
280-10
11:00 AM
HIGH PRECISION CHEMICAL AND ISOTOPIC CONSTRAINTS ON THE ORIGIN AND CRUSTAL PROCESSING OF NORTHERN CASCADE ARC LAVAS
MARTINDALE, Marina, MULLEN, Emily K. and WEIS, Dominique, Earth, Ocean and Atmospheric Sciences, University of British Columbia, Pacific Centre for Isotopic and Geochemical Research, 2020-2207 Main Mall, Vancouver, BC V6T 1Z4, Canada
280-11
11:15 AM
ALONG-ARC GEOCHEMICAL VARIATIONS OF CASCADES MAFIC MAGMAS: A ROLE FOR SUBDUCTED SEDIMENT IN THE SOUTHERN ARC?
JOHNSON, Emily R., Department of Geological Sciences, New Mexico State University, PO Box 30001, MSC 3AB, Las Cruces, NM 88003, WALOWSKI, Kristina, Department of Geological Sciences, University of Oregon Dept. of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403, DEBARI, Susan M., Geology, Western Washington University, M.S. 9080, Bellingham, WA 98225 and BINDEMAN, Ilya N., Geological Sciences, 1272 University of Oregon, Eugene, OR 97403
280-12
11:30 AM
SMALL SCALE MANTLE HETEROGENEITIES OF THE CASCADE ARC RECORDED IN PRIMITIVE BASALTS OF THE POISON LAKE CHAIN IN THE LASSEN REGION OF THE SOUTHERN CASCADES
TEASDALE, Rachel, Geological & Environmental Sciences, CSU Chico, Chico, CA 95929-0205 and WENNER, Jennifer M., Geology Department, Univ of Wisconsin Oshkosh, 800 Algoma Blvd, Oshkosh, WI 54901
 
11:45 AM
Discussion
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