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GSA 2019 ANNUAL MEETING & EXPOSITION

T16. Building Bridges between Modern and Southwest U.S. (Southern California, Nevada,
Deep-Time Critical Zones Arizona, and Northern Mexico)
Cosponsors: GSA Soils and Soil Processes Division; GSA Cosponsor: GSA Structural Geology and Tectonics Division
Hydrogeology Division; GSA Quaternary Geology and Disciplines: Petrology, Igneous, Tectonics/Tectonophysics,
Geomorphology Division; GSA Karst Division Stratigraphy
Disciplines: Soils, Sediments, Clastic, Quaternary Geology Advocates: Michelle Gevedon; Diane Clemens-Knott
Advocates: Ashlee Laura Denton Dere; Gary E. Stinchcomb; Contributions should elucidate the magmatic, tectonic, hydro-
Zsuzsanna Balogh-Brunstad; Steven G. Driese; Lee C. Nordt; thermal, or sedimentological histories of regions surrounding
Bryan G. Moravec the Jurassic Cordilleran arc to better understand the timing,
This session seeks to build bridges in communication among extent, and character of this extensional regime and its implica-
researchers working in either modern or deep-time Critical Zones. tions for margin evolution.

PETROLOGY, IGNEOUS T21. Reading Igneous Textures
Cosponsor: Mineralogical Society of America
T17. Small-Volume Cenozoic Volcanism of the Disciplines: Petrology, Igneous, Mineralogy/Crystallography,
Interior West of the United States Volcanology
Cosponsor: GSA Mineralogy, Geochemistry, Petrology, and Advocates: David London; Mona-Liza C. Sirbescu
Volcanology Division This session is an open call to anyone working on aspects of
Disciplines: Petrology, Igneous, Volcanology, Geochronology igneous texture, from nanometer to macroscopic scales, on the
Advocates: Tiffany A. Rivera; Brian R. Jicha basis of field, laboratory, or numerical studies. All igneous rocks
This session will highlight research focused on understanding the are included.
origin, evolution, eruption, and deposition of geologically recent
small-volume volcanic products found in western North America. VOLCANOLOGY

T18. The Solidification Path of Magma— T22. Basaltic Volcanism on Earth and Beyond:
Information from Igneous Rocks, Eruptions, Exploring the Physical Controls on Eruptive
and Experimental Petrology: In Honor of the Styles and Associated Deposits
Mineralogical Society of America Awardee for Disciplines: Volcanology, Planetary Geology, Petrology, Igneous
2019, Olivier Namur Advocates: Jean-Francois Smekens; Erika Rader; Amanda B.
Cosponsor: Mineralogical Society of America Clarke; Kurt Roggensack; Brett B. Carr
Disciplines: Petrology, Igneous, Volcanology, Economic Geology We welcome abstracts that investigate the causes and conse-
Advocates: Michael D. Higgins; Bernard Charlier quences of basaltic volcanism of all scales and styles, using two
Placing constraints on the solidification path of magma, or its or more approaches, such as field, laboratory, and numerical
liquid line of descent, is a key problem in igneous petrology: techniques.
Information must be integrated from experimental reconstruc-
tions, together with decoding of the plutonic volcanic record. PETROLOGY, METAMORPHIC
T19. Subduction Zone Systems: Geochemical, T23. Metamorphism and Orogenesis at
Petrochronological, and Geophysical Constraints Convergent Plate Margins
on Lithospheric Structure, Composition, and Cosponsor: GSA Structural Geology and Tectonics Division
Geodynamics Disciplines: Petrology, Metamorphic, Tectonics/Tectonophysics
Cosponsors: GSA Structural Geology and Tectonics Division; Advocates: Richard M. Palin; Kyle T. Ashley
GSA Geophysics and Geodynamics Division Metamorphism at convergent plate margins imparts a funda-
Disciplines: Petrology, Igneous, Geophysics/Geodynamics, mental control on the spatio-temporal evolution of collisional
Tectonics/Tectonophysics and accretionary orogens. We seek studies investigating drivers
Advocates: Antoine Triantafyllou; Mihai N. Ducea; Jonathan R. and/or petrological and tectonic implications of metamorphism
Delph; Mark K. Reagan of the continental crust.
This session aims to provide new insights into the evolution of
the lithosphere during subduction and collisional tectonics, T24. Metamorphic Petrology Past, Present, and
through multidisciplinary contributions: petrochronology, geo- Future: Preparing for the Next 100 Years with
chemistry, experimental petrology, geophysical studies, and the Mineralogical Society of America
geodynamic modelling. Cosponsors: Mineralogical Society of America; GSA History
and Philosophy of Geology Division
T20. Rift-Grabens, Volcano-Sedimentary Strata, Disciplines: Petrology, Metamorphic, Mineralogy/
Plutons, and Transtensional Shear Zones: A Crystallography, Geochronology
Multi-Disciplinary Approach to Reconstructing Advocates: Robert M. Holder; Mark J. Caddick; Sarah C.
the Jurassic Cordilleran Margin of the Penniston-Dorland

20 GSA Today | May 2019