V012
Chemical and mechanical processes at plate margins: insights from the exhumed rock record
Session ID#: 75991
Session Description:
Plate boundaries are the sites of complex feedbacks between chemical and physical petrogenetic processes. Heat and mass transfer and deformation promote metamorphism and magmatism, which in turn lead to changes in rock strength. These strongly-coupled processes influence the timescales and pathways of mass transport, the expression of deformation, and the crust’s rheologic evolution. Exhumed rocks provide the only direct means to investigate these processes and can ultimately inform geophysical, geodynamic and geochemical experiments and models. In this session, we invite contributions that utilize the metamorphic and magmatic rock records to investigate physical and chemical processes at plate margins. In particular, we encourage submissions that apply novel approaches to tackle outstanding questions, including but not limited to: chemo-mechanical evolution from the shallow to deep lithosphere, the roles of fluids in metamorphic, metasomatic and magmatic processes and rheologic changes in rocks, and mechanisms, rates and pathways of mass and heat transport.
Co-Organized:
Index Terms:
3660 Metamorphic petrology [MINERALOGY AND PETROLOGY]
8031 Rheology: crust and lithosphere [STRUCTURAL GEOLOGY]
8150 Plate boundary: general [TECTONOPHYSICS]
8178 Tectonics and magmatism [TECTONOPHYSICS]
Primary Convener: Kayleigh M Harvey, University of Maryland College Park, College Park, MD, United States
Conveners: Cailey Brown Condit, Massachusetts Institute of Technology, Cambridge, MA, United States and Andrew Smye, Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Primary Liaison: Kayleigh M Harvey, University of Maryland College Park, College Park, MD, United States
What drove partial melting of Earth's youngest exposed migmatites? Insights from monazite petrochronology of the Western Himalayan Syntaxis (Invited) (489194)
Victor Guevara1, Telemak Olsen2, Lisa Whalen3, Andrew R Kylander-Clark4, Mark J Caddick3, Andrew Smye5, Micheal P Searle6 and David J Waters7, (1)Amherst College, Geology, Amherst, MA, United States, (2)Skidmore College, Geosciences, Saratoga Springs, NY, United States, (3)Virginia Tech, Blacksburg, VA, United States, (4)UC Santa Barbara, Santa Barbara, CA, United States, (5)Pennsylvania State University, Department of Geosciences, University Park, PA, United States, (6)Department of Earth Sciences, University of Oxford, Oxford, United Kingdom, (7)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Pressure Perturbations Caused by Local Weakening of Deep Continental Crust (Invited) (489813)
Bjorn Jamtveit1, Evangelos Moulas2, Xin Zhong1, Arianne Petley-Ragen1, Sarah Incel1, Marcin Dabrowski and Stefan M Schmalholz4, (1)University of Oslo, Oslo, Norway, (2)University of Lausanne, Lausanne, Switzerland, (3)University of Lausanne, Institute of Earth Sciences, Lausanne, Switzerland
The Life of Zircon and Monazite in a Cenozoic Polymetamorphic Terrane – Higher Himalayan Crystallines (HHC) (504795)
Shashank Prabha Mohan1, Ian S Williams2 and Sandeep Singh1, (1)Indian Institute of Technology Roorkee, Department of Earth Sciences, Roorkee, India, (2)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia
Evaluating the Timescales of Tectonic Mélange-forming Processes Using Sm-Nd Garnet Geochronology (508838)
Sarah Penniston-Dorland1, Kayleigh M Harvey1, Stephanie Walker2, Paul G Starr3, Matthew J Kohn4 and Ethan Baxter3, (1)University of Maryland College Park, College Park, MD, United States, (2)Boston College, Department of Earth and Environmental Sciences, Boston, MA, United States, (3)Boston College, Department of Earth and Environmental Sciences, Chestnut Hill, MA, United States, (4)Boise State University, Boise, ID, United States
Subduction Erosion, Basement Destruction and Crust Growth: Evidence from P-T-t Evolution of the Eclogite-Bearing Jitang Metamorphic Complex (Central Tibet) (509288)
Xin Jin1,2, Yuxiu Zhang1,3, Donna L Whitney4, Natalie H. Raia5, Clementine Hamelin6, Jun-cheng Hu1 and KHalid Bin Shahbaz1, (1)University of Chinese Academy of Sciences, Beijing, China, (2)University of Minnesota Twin Cities, Minneapolis, MN, United States, (3)Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing, China, (4)University of Minnesota Twin Cities, Department of Earth and Environmental Sciences, Minneapolis, MN, United States, (5)University of Minnesota Twin Cities, Department of Earth Sciences, Minneapolis, MN, United States, (6)University of Minnesota Twin Cities, Minneapolis, United States
Oscillations of ductile to brittle deformation during exhumation of a late Paleozoic terrane boundary from lower crustal anatectic to shallow seismic crustal conditions. (525518)
Robert P Wintsch, Indiana University Bloomington, Bloomington, IN, United States; Wesleyan University, Earth and Environmental Sciences, Middletown, CT, United States, Ryan Thomas Deasy, Indiana University - Bloomington, Bloomington, IN, United States, John N Aleinikoff, U.S. Geological Survey, Denver, CO, United States, Michael J Kunk, USGS Headquarters, Reston, VA, United States and Gregory J Walsh, U.S. Geological Survey, Montpelier, VT, United States
Conditions fluid-rock interactions and related chemical mobilities in magma-poor rifted margins: insights from rodingites and serpentinites (531733)
Marc Ulrich, University of Strasbourg, Strasbourg Cedex, France, Méderic Amann, University of Strasbourg, IPGS-EOST, CNRS-UMR 7516, Strasbourg Cedex, France, Manuel Munoz, Université de Montpellier, Géosciences Montpellier, Montpellier, France, Damien Lemarchand, University of Strasbourg, Strasbourg Cedex, CDX, France, Eric Pelt, Dunedin, New Zealand, Daniel Sauter, Institut de Physique du Globe de Strasbourg; UMR7516, Université de Strasbourg, CNRS, Strasbourg, France and Gianreto Manatschal, University of Strasbourg, Strasbourg, France
Overpressure recorded in pseudotachylyte caused by frictional melting during earthquakes (538867)
Xin Zhong1, Arianne Petley-Ragen1, Sarah Hatice Maria Incel1, Marcin Dabrowski1,2, Häkon Austrheim1, Niels Højmark Andersen3 and Bjorn Jamtveit1, (1)University of Oslo, Oslo, Norway, (2)Polish Geological Institute - NRI, Wroclaw, Poland, (3)University of Oslo, Department of Chemistry, Oslo, Norway
Nd isotope disequilibrium recorded in monazite from exhumed rocks: New implications for monazite and garnet geochronology (565818)
Da Wang1,2, Christopher M Fisher2, Jeffrey D. Vervoort2 and Hui Cao3, (1)Carnegie Inst Washington, Department of Terrestrial Magnetism, Washington, DC, United States, (2)Washington State University, Pullman, WA, United States, (3)CAGS Chinese Academy of Geological Sciences, Beijing, China
Barrovian, Not So Fast: Insights Into the Timing and Rate of Metamorphism in NE Scotland Using Garnet Sm-Nd Geochronology (584191)
Stephanie Walker, Boston College, Department of Earth and Environmental Sciences, Boston, MA, United States, Ethan Baxter, Boston College, Department of Earth and Environmental Sciences, Chestnut Hill, MA, United States, Anna BIRD, University of Hull, Hull, United Kingdom and Jay James Ague, Yale Univ, New Haven, CT, United States
The growth of new crust: tracing the chemical and textural evolution of magma through multiple stages of magmatism, Chelan Migmatite Complex, North Cascades, Washingtion (616529)
Megan Kjelland1, Jared D Van Laethem2, Rebekah Krohn2, Rylynn Carney3, Tessa Guthrie3, Chris G Mattinson4, Erin K Shea5 and Andrew R Kylander-Clark6, (1)Central Washington University, Ellensburg, WA, United States, (2)Central Washington University, Ellensburg, United States, (3)Yakima Valley College, Yakima, United States, (4)Central Washington University, Geological Sciences, Ellensburg, WA, United States, (5)MIT--EAPS, Cambridge, MA, United States, (6)UC Santa Barbara, Santa Barbara, CA, United States
Thermal structure and exhumation history of the Northern Range, Trinidad: new constraints from RSCM thermometry (617502)
Ivano Gennaro, University of Toronto, Earth Sciences, Toronto, Canada, John C Weber, Grand Valley State Univ, Allendale, MI, United States, Alberto Vitale Brovarone, Universita Degli Studi di Torino, Dipartimento di Scienze della Terra, Torino, Italy and Xu Chu, University of Toronto, Earth Sciences, Toronto, ON, Canada
Chemical and mechanical controls on metasomatic assimilation of eclogite blocks in high-pressure host gneiss (623785)
Carrie A Menold, Albion College, Geological Sciences, Albion, MI, United States, Marty Grove, Stanford University, Geological Sciences, Stanford, CA, United States and Catherine A. Macris, Indiana University Purdue University Indianapolis, Indianapolis, IN, United States
Monazite Growth in Response to Metamorphic and Deformation Events at Different Structural Levels (631804)
Peng Jiang, University of Florida, Department of Geological Sciences, Ft Walton Beach, FL, United States, David A Foster, University of Florida, Department of Geological Sciences, Gainesville, FL, United States, Ben Goscombe, Integrated Terrane Analysis Research (ITAR), Aldgate, SA, Australia and Andres Trucco, University of Florida, Herbert Wertheim College of Engineering-Research Service Centers, Gainesville, FL, United States
