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Abstracts Deadline: July 15, 2003


T130 top Advances in Understanding Fault Mechanics: Beyond Mohr-Coulomb
GSA Structural Geology and Tectonics Division
Juliet G. Crider, Western Washington University, Bellingham, WA
In the years since Anderson's "Dynamics of Faulting," many other approaches to faulting have been proposed, but few are as widely applied. This session will review and advance alternative or supplemental theories for understanding how faults work, plus highlight successful field applications of new or alternative approaches. ORAL
Structural Geology; Geophysics/Tectonophysics/Seismology; Neotectonics/Paleoseismology
T131 top Seismogenic Friction and Pseudotachylites
GSA Structural Geology and Tectonics Division, GSA Geophysics Division
Eric C. Ferre, Southern Illinois University, Carbondale, IL; Joseph L. Allen, Concord College, Athens, WV; Kieran O'Hara, University of Kentucky, Lexington, KY
Fault-related pseudotachylites are the fascinating product of coseismic deformation occurring during large magnitude earthquakes. This session will present a blend of new results from structural geology, seismology, rock magnetism, geochemistry, mineralogy, and geochronology. ORAL and POSTER
Structural Geology; Geophysics/Tectonophysics/Seismology; Tectonics
T132 top Understanding Coupled Metamorphic and Deformational Processes: Advances in Integrated Textural, Chemical, and Microstructural Analysis
GSA Structural Geology and Tectonics Division; Mineralogical Society of America
Gary S. Solar, SUNY College, Buffalo, NY; Aaron Stallard, University of Canterbury, Christchurch, New Zealand
Innovative combination of petrologic, geochemical, and structural analysis reveals the dynamics between synchronous metamorphism and deformation. Speakers will address these relations using established and new techniques of investigating textures and chemistry in deformed metamorphic rocks to illustrate our understanding of these processes. ORAL and POSTER
Structural Geology; Petrology, Metamorphic; Tectonics
T133 top Exhumation Along Major Continental Strike-Slip Fault Systems
GSA Structural Geology and Tectonics Division
Sarah Roeske, University of California, Davis, CA; Alison Till, U.S. Geological Survey, Anchorage, AK; Dwight Bradley, U.S. Geological Survey, Anchorage, AK
Exhumation of metamorphic rocks along transcurrent faults occurs in both extension and contraction environments. This session seeks contributions from researchers examining this process in active or ancient orogens and/or by analogue or numerical modeling. ORAL and POSTER
Tectonics; Structural Geology; Petrology, Metamorphic
T134 top The Columbia River Flood Basalts: New Insights into the Volcanism, Petrology, and Tectonism of a Large Igneous Province
GSA Structural Geology and Tectonics Division
Heather L. Petcovic, Oregon State University, Corvallis, OR; Bart S. Martin, Ohio Wesleyan University, Delaware, OH; Stephen P. Reidel, Pacific Northwest National Lab and Battelle Memorial Institute, Richland, WA
We seek papers covering a broad range of topics, including: the origin of the Columbia River Flood Basalts, lava emplacement rates and mechanisms, magma petrogenesis and geochemical modification, and tectonic history of the Columbia Plateau. ORAL and POSTER
Volcanology; Petrology, Igneous; Tectonics
T135 top Hydrothermal Alteration on Active Volcanoes: Processes, Rates, and Applications to Hazards and Resources
Society of Economic Geologists
David A. John, U.S. Geological Survey, Menlo Park, CA; Thomas W. Sisson, U.S. Geological Survey, Menlo Park, CA
Study of hydrothermal alteration traditionally has been undertaken by economic geologists interested in mineral and geothermal resources. This session aims at bringing together researchers from many disciplines to present new research results on the processes that form hydrothermal alteration on active volcanoes and applications of these results. ORAL
Economic Geology; Volcanology; Geochemistry, Other
T136 top Shallow Submarine Hydrothermal Vents: Geology, Geochemistry, and Biota
Rosa Ma. Prol-Ledesma, Universidad Nacional Aut-noma de Mˇxico, Mˇxico DF, Mˇxico; Carles Canet, Universidad Nacional Aut-noma de Mˇxico, Mˇxico D.F., Mˇxico; Matthew J. Forrest, Moss Landing Marine Labs, Moss Landing, CA
This session will address the unique qualities of the mineralogy and biota observed around shallow-water hydrothermal vents. The geochemistry of the vent fluids is the result of mixing of thermal reservoir water and seawater, and is influenced by the microbial activity present at the vents. ORAL and POSTER
Marine/Coastal Science
T137 top Submarine Hydrothermal Systems: The Emergence of Geobiology
Deborah S. Kelley, University of Washington, Seattle, WA; John Baross, University of Washington, Seattle, WA
The connection between volcanism and life perhaps is nowhere more evident than at mid-ocean ridges. This session will focus on new discoveries surrounding linkages among crustal formation, hydrothermal vents, and life at mid-ocean ridge spreading centers. ORAL and POSTER
Geomicrobiology; Volcanology; Geochemistry, Other
T138 top From Oxides to Anorthosites: A Tribute to D.H. Lindsley
Mineralogical Society of America; Geochemical Society
Hanna Nekvasil, State University of New York, Stony Brook, NY; B. Ronald Frost, University of Wyoming, Laramie, WY
This session will focus on new contributions to phase stability and thermodynamics of igneous minerals and melts, and the origin and evolution of rocks in intraplate regimes, especially anorthosites and associated rocks. ORAL and POSTER
Petrology, Experimental; Petrology, Igneous; Mineralogy/Crystallography
T139 top Granites at Convergent Margins: Physical and Chemical Constraints on Processes and Petrogenesis
Mineralogical Society of America
Paul B. Tomascak, University of Maryland, College Park, MD; Scott Paterson, University of Southern California, Los Angeles, CA
We seek papers on investigations of granites and granophile mineral deposits at modern and ancient convergent margins. Of primary interest: studies underscoring the importance of integrated field-structural-geophysical-geochronological-geochemical techniques, and novel laboratory studies. ORAL and POSTER
Petrology, Igneous; Structural Geology; Geochemistry, Other
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