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GSA 2019 ANNUAL MEETING & EXPOSITION

Advocates: Jessica A. Thompson Jobe; Katherine A. Giles T54. Origin and Evolution of Proterozoic
This session seeks multidisciplinary studies addressing Lithosphere in the Western United States
Paleozoic–Quaternary evolution of the Paradox Basin and Four Cosponsor: GSA Structural Geology and Tectonics Division
Corners Region, Southwestern U.S. We seek a range of outcrop, Disciplines: Tectonics/Tectonophysics, Structural Geology,
subsurface, and modeling studies that focus on lithospheric to Petrology, Metamorphic
surface processes. Advocates: Graham B. Baird; Kevin H. Mahan; Yvette D.
Kuiper; Richard M. Palin
T50. Structure and Tectonic Studies, from Outcrop The Proterozoic rocks of the Western U.S. record a long
to Supercontinent: In Honor of Ian Dalziel history of magmatic, metamorphic, and deformation processes.
Cosponsor: GSA Structural Geology and Tectonics Division This session welcomes any presentation that offers insight into
Disciplines: Tectonics/Tectonophysics, Geophysics/ the tectonic origin and history of these rocks.
Geodynamics, Stratigraphy
Advocates: B.M. Eglington; Terry J. Wilson; Lawrence Lawver T55. New Perspectives on Integrating Fault Zone
Ian Dalziel has stimulated research by students and interna- Behavior through the Full Thickness of the
tional collaborators over many years. He continues to motivate Continental Lithosphere
researchers in fields related to supercontinent cyclicity and the Cosponsors: GSA Structural Geology and Tectonics Division;
development of Antarctica, South America, and Africa. This GSA Mineralogy, Geochemistry, Petrology, and Volcanology
session is to honor him. Division; GSA Geophysics and Geodynamics Division
Disciplines: Tectonics/Tectonophysics, Structural Geology,
T51. Shaping the Landscape: The Interaction Geophysics/Geodynamics
between Fractures, Erosion, and Plate Tectonics Advocates: Keith A. Klepeis; Elena A. Miranda; Joshua J.
Cosponsors: GSA Structural Geology and Tectonics Division; Schwartz; Laura E. Webb; Harold Stowell
GSA Quaternary Geology and Geomorphology Division This session focuses on research aimed at determining how
Disciplines: Tectonics/Tectonophysics, Geomorphology, deformation in faults and shear zones connects vertically
Quaternary Geology through continental lithosphere from Earth’s surface to the
Advocates: Cassandra A.P. Brigham; Chelsea Phipps Scott upper mantle. We seek contributions from any observational,
Fractures in bedrock and sediment are often key to deciphering analytical, or modeling perspective.
landscape history, geomorphic processes, and tectonics. This ses-
sion will highlight the cross-disciplinary linkages between fractur- T56. New Developments in the Appalachian-
ing, erosion, and tectonics at different spatial and temporal scales. Caledonian-Variscan Orogen
Cosponsor: GSA Structural Geology and Tectonics Division
T52. Quaternary Tectonics of the Eastern Disciplines: Tectonics/Tectonophysics, Structural Geology,
California Shear Zone Geochronology
Cosponsors: GSA Structural Geology and Tectonics Division; Advocates: Yvette Kuiper; R. Damian Nance; J. Brendan
GSA Quaternary Geology and Geomorphology Division; GSA Murphy; Rob Strachan
Geophysics and Geodynamics Division We welcome any contributions including new data and/or
Disciplines: Tectonics/Tectonophysics, Quaternary Geology, interpretations based on work in the Appalachian-Caledonian-
Geophysics/Geodynamics Variscan orogen along the eastern and northern margins of
Advocates: Andrew J. Cyr; Victoria E. Langenheim; Michael E. North America and in Europe and Africa.
Oskin
This session will focus on the bedrock, surficial geologic, and T57. Low-Angle Subduction beneath the
geophysical evidence for the distribution of Quaternary slip and Cordillera
related deformation across the Mojave Desert portion of the Cosponsors: GSA Structural Geology and Tectonics Division;
Eastern California Shear Zone. GSA Geochronology Division; GSA Mineralogy, Geochemistry,
Petrology, and Volcanology Division
T53. Present-Day and Ancient Flat-Slab Disciplines: Tectonics/Tectonophysics, Geochronology,
Subduction in Rock Records, Geophysical Volcanology
Images, and Geodynamic Models Advocates: Nikki M. Seymour; Carl E. Jacobson; Alan D.
Cosponsor: GSA Structural Geology and Tectonics Division Chapman; Marty J. Grove
Disciplines: Tectonics/Tectonophysics, Geophysics/ Low-angle subduction has been tied to a range of features,
Geodynamics, Geochronology including subduction complexes, basement-cored uplifts, and
Advocates: Yiduo Liu; Tyson Michael Smith extensive volcanism. We encourage contributions that inte-
Flat-slab subduction is observed in the present day and grate results from mapping, petrology, geochronology, geo-
proposed for past, subduction zones all over the world. A global chemistry, and geophysics to produce a holistic view of low-
appraisal of flat-slabs helps us better evaluate the observations angle subduction processes.
versus model predictions, and commonalities versus differences.

24 GSA Today | May 2019