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GSA 2017 ANNUAL MEETING & EXPOSITION
T225. New Perspectives on Cordilleran Tectonics, T229. Paleocene-Eocene Tectonic and Magmatic
Paleogeography, and Metallogeny Evolution of the Pacific Northwest
Cosponsors: GSA Sedimentary Geology Division; SEPM (Society Cosponsors: GSA Structural Geology and Tectonics Division;
for Sedimentary Geology); Society of Economic Geologists; GSA Sedimentary Geology Division; GSA Mineralogy,
GSA Structural Geology and Tectonics Division Geochemistry, Petrology, and Volcanology Division
Disciplines: Tectonics/Tectonophysics, Stratigraphy, Economic Disciplines: Tectonics/Tectonophysics, Petrology, Igneous,
Geology Geophysics/Geodynamics
Advocates: Luke P. Beranek; Justin V. Strauss; Stephen J. Piercey Advocates: Jeffrey H. Tepper; Eugene D. Humphreys;
Robert B. Miller
This session welcomes new ideas on Cordilleran evolution that
use the Neoproterozoic-Cenozoic rock record from Alaska to Paleogene magmatism, extension, basin subsidence, and fault-
Mexico. Contributions for multidisciplinary studies in stratigra- ing spanned the Pacific Northwest, perhaps related to ridge sub-
phy, petrology, structural geology, geochemistry, and geochronol- duction, slab breakoff, and/or Siletzia accretion. We seek contri-
ogy are particularly welcome. butions on this “Challis episode” from structure, tectonics,
petrology, sedimentation, and geophysics.
T226. New Perspectives on Processes of Subduction Initiation
and Termination T230. Polygenetic Mélanges: A Glimpse on Tectono-
Sedimentary Recycling in Convergent Margins
Cosponsors: GSA Structural Geology and Tectonics Division;
GSA Mineralogy, Geochemistry, Petrology, and Volcanology Cosponsors: GSA International/International Interdisciplinary
Division; GSA Geophysics Division Interest Group; IGCP 640 program S4SLIDE (Significance of
Modern and Ancient Submarine Slope Landslides); GSA
Disciplines: Tectonics/Tectonophysics, Petrology, Igneous, Structural Geology and Tectonics Division; GSA Sedimentary
Geophysics/Geodynamics Geology Division
Advocates: Sarah Roeske; Nancy Riggs; Susanne Buiter; Douwe Disciplines: Tectonics/Tectonophysics, Sediments, Clastic,
van Hinsenberg Structural Geology
This session examines the formation and termination of sub- Advocates: Andrea Festa; Kei Ogata; Gian Andrea Pini
duction zones, whether due to passage of a triple junction, change
in plate motion, or collision. Ancient and modern records and This session addresses the definition of structures, fabric, and
modeling studies of these processes are welcome. texture diagnostic of sedimentary mélanges overprinted by other
processes and the estimation of their occurrence in fossil, exhumed,
T227. Ophiolite and Ocean Plate Stratigraphy Records in and present-day accretionary wedges and collisional chains.
Modern and Ancient Accretionary and Collisional Orogenic
Belts in the Circum-Pacific Region T231. Subduction Top to Bottom 2 (ST2B-2), Cascadia
and Beyond
Cosponsors: GSA Structural Geology and Tectonics Division;
GSA Mineralogy, Geochemistry, Petrology, and Volcanology Cosponsors: GSA Structural Geology and Tectonics Division;
Division; GSA Geophysics Division; Geological Society of China; Future of Tectonics Initiative
GSA Sedimentary Geology Division
Disciplines: Tectonics/Tectonophysics, Geophysics/
Disciplines: Tectonics/Tectonophysics, Petrology, Igneous, Geodynamics, Volcanology
Geophysics/Geodynamics
Advocates: Gray E. Bebout; David W. Scholl; Robert Stern;
Advocates: Yildirim Dilek; Jingsui Yang Anne Trehu; Joan Gomberg; Thomas W. Sisson
We encourage original contributions on the origins and Subduction zone processes and their products, including the
emplacement mechanisms of ophiolites and remnants of ocean associated natural hazards, are important to science and influence
plate stratigraphy in the accretionary and collisional orogenic society. This session assesses geological, geophysical, geochemi-
belts in the Circum-Pacific region. cal, and theoretical advancements and promising directions for
future research, emphasizing Cascadia.
T228. Origin, Accretion, and Translation of
Mesozoic-Cenozoic Terranes along the Pacific Margin T232. Subduction Zone Response to Ridge and Plateau
of North America Collision: Perspectives from the Archean to the Cenozoic
Cosponsor: GSA Structural Geology and Tectonics Division Cosponsor: GSA Structural Geology and Tectonics Division
Discipline: Tectonics/Tectonophysics Discipline: Tectonics/Tectonophysics
Advocates: David T. Katopody; Mark T. Brandon; Bernard Housen Advocates: Michael P. Eddy; Paul J. Umhoefer
The Pacific margin of North America is the center of a long- Ridge-trench interaction and oceanic plateau accretion have
standing controversy about terrane mobility along continental profound effects on the geology of convergent margins. We wel-
margins. This session will serve as a forum to identify remaining come submissions that document these effects throughout Earth’s
problems and opportunities in Cordilleran tectonics. history using field, geophysical, and/or modeling data.
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