V23C:
4D Variations in Cascade Arc Magmatic Systems: Linking Tectonics, Geochemistry, and Geodynamics I


Session ID#: 9089

Session Description:
This session draws together researchers in tectonics, geophysics, geochronology, geochemistry, and dynamic modeling to improve our spatial and temporal understanding of the Cascades magmatic arc. Since its enigmatic inception about 40 Ma, the arc has undergone significant changes in magmatic productivity and composition. In addition, the Cascades are volcanically and tectonically segmented into regions that differ in volcanic style, flux, and composition, as well as in faulting style, degree of crustal rotation, and relative uplift. These spatio-temporal variations may reflect differences in subduction rate or angle, the nature of the lower and upper plate, and regional tectonics. Can we determine which of these relationships are causative, and can we derive a geodynamic model for the variability of volcanism and plutonism through space and time? We seek contributions from researchers with geochemical or geophysical data sets, conceptual or numerical models, and other approaches that illuminate and help address these fundamental questions.
Primary Convener:  Bradley William Pitcher, Oregon State University, CEOAS, Corvallis, OR, United States
Conveners:  Thomas W Sisson, USGS, Menlo Park, CA, United States, Patricia A McCrory, US Geological Survey, Menlo Park, CA, United States and Haiying Gao, University of Massachusetts Amherst, Department of Geosciences, Amherst, MA, United States
Chairs:  Bradley William Pitcher, Oregon State University, CEOAS, Corvallis, OR, United States, Haiying Gao, University of Massachusetts Amherst, Department of Geosciences, Amherst, MA, United States, Patricia A McCrory, U.S. Geological Survey, Menlo Park, CA, United States and Thomas W Sisson, USGS California Water Science Center Menlo Park, Menlo Park, CA, United States
OSPA Liaison:  Thomas W Sisson, USGS California Water Science Center Menlo Park, Menlo Park, CA, United States

Cross-Listed:
  • S - Seismology
  • T - Tectonophysics
Index Terms:

3640 Igneous petrology [MINERALOGY AND PETROLOGY]
8178 Tectonics and magmatism [TECTONOPHYSICS]
8185 Volcanic arcs [TECTONOPHYSICS]
8413 Subduction zone processes [VOLCANOLOGY]

Abstracts Submitted to this Session:

Imaging segmentation along the Cascadia subduction zone (Invited) (61085)
Richard M Allen, William Bythewood Hawley and Robert Martin-Short, University of California Berkeley, Berkeley, CA, United States
Helium as a Tracer for Fluids Released from Juan de Fuca Lithosphere Beneath the Cascadia Forearc (67689)
Patricia A McCrory1, James E Constantz1, Andrew G Hunt2,3 and J. Luke Luke Blair4, (1)U.S. Geological Survey, Menlo Park, CA, United States, (2)U.S. Geological Survey, Denver Federal Center, Denver, CO, United States, (3)U.S. Geological Survey, Denver, CO, United States, (4)U.S. Geological Survey, Menlo Park, United States
Basalt of Summit Creek: Eocene Magmatism Associated with Farallon Slab Break Off (69408)
Lisa Bayla Kant, University of Wyoming, Geology and Geophysics, Laramie, WY, United States, Jeffrey H Tepper, University of Puget Sound, Geology, Tacoma, WA, United States and Michael Patterson Eddy, Massachusetts Institute of Technology, Cambridge, MA, United States
Post-Eocene Subduction Dynamics and Mantle Flow beneath Western U.S. (Invited) (67205)
Lijun Liu, University of Illinois at Urbana Champaign, Geology, Urbana, United States, Quan Zhou, University of Illinois at Urbana Champaign, Urbana, United States and Tiffany Leonard, University of Illinois at Urbana Champaign, Urbana, IL, United States
Tectonic Geomorphology and Volcano-Tectonic Interaction in the Eastern Boundary of the Southern Cascades (Hat Creek Graben), California, USA (69074)
Engielle Mae R Paguican, Vrije Universiteit Brussels, Brussels, Belgium; University at Buffalo, Department of Geology, Buffalo, NY, United States and Marcus I Bursik, University at Buffalo, Department of Earth Sciences, Buffalo, NY, United States
Lifespans of Cascade Arc volcanoes (68341)
Andrew T Calvert, USGS, Menlo Park, CA, United States
Along-arc Variations in Subduction Inputs and Mantle Source in Cascadia: Insights from Basaltic Arc Magmas (Invited) (81362)
Emily R Johnson, USGS Cascades Volcano Observatory, Vancouver, United States, Kristina J Walowski, University of Edinburgh, School of Geosciences, Edinburgh, United Kingdom, Paul J Wallace, University of Oregon, Department of Earth Sciences, Eugene, United States, Susan M DeBari, Western Washington University, Geology Department, Bellingham, United States and Ilya Bindeman, University of Oregon, Department of Earth Sciences, Eugene, OR, United States
Re-Assessment of Cascade Arc Mantle Heterogeneity and Slab Inputs using High-Precision Pb-Hf-Sr-Nd Isotopic Data (Invited) (76025)
Emily Mullen1,2, Dominique Weis3 and Marina Martindale1, (1)University of British Columbia, Vancouver, BC, Canada, (2)Laboratoire Magmas et Volcans, Clermont-Ferrand Cedex, France, (3)University of British Columbia, PCIGR, Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada

See more of: Volcanology, Geochemistry and Petrology