V014
Continental Metamorphism as an Agent for Deep Crustal Differentiation
Session ID#: 75119
Session Description:
Metamorphism in the middle to lower continental crust can lead to significant changes in composition, rheology, density, and seismic velocity. Several dynamic processes are impacted by high temperature (>700°C) metamorphism and melting in the deep crust. These include lower crustal flow, relamination, dehydration, development and preservation of orogenic roots, and the production of melts and residues, among others. Much remains unknown regarding the magnitude and timescales of these processes and the degree to which they influence the differentiation of continental crust. We seek contributions that will explore these processes and other advances pertaining to continental metamorphism using geochemical, geochronological, petrological, structural, and geophysical datasets.
Index Terms:
1020 Composition of the continental crust [GEOCHEMISTRY]
3672 Planetary mineralogy and petrology [MINERALOGY AND PETROLOGY]
8110 Continental tectonics: general [TECTONOPHYSICS]
8125 Evolution of the Earth [TECTONOPHYSICS]
Primary Convener: Gregory Dumond, University of Arkansas, Fayetteville, AR, United States
Conveners: Stacia M Gordon, University of Nevada, Reno, Department of Geological Sciences and Engineering, Reno, NV, United States and Roberta L Rudnick, University of California Santa Barbara, Department of Earth Sciences, Santa Barbara, CA, United States
Primary Liaison: Gregory Dumond, University of Arkansas, Fayetteville, AR, United States
Composition of deep crust revealed by systematic survey of crustal Vs and Poisson’s ratio at large seismic arrays (501677)
Weisen Shen, Stony Brook University, Syosset, United States, Siyuan Sui, Stony Brook University, Geosciences, Port Jefferson Station, United States and Lingli Li, China Earthquake Administration, Hefei, China; Stony Brook University, Stony Brook, United States
Are TTGs and Mafic Granulites Consanguineous? A Case Study in the Kapuskasing Uplift, Canada (521523)
Jillian Kendrick1, Chris Yakymchuk1, Manuel Duguet2 and Desmond Moser3, (1)University of Waterloo, Earth and Environmental Sciences, Waterloo, ON, Canada, (2)Ontario Geological Survey, Sudbury, ON, Canada, (3)University of Western Ontario, Earth Sciences, London, ON, Canada
Records of Garnet Growth in Zircon and Monazite from High-Grade Rocks (529705)
Lorraine Tual1,2, Ellen Kooijman1, Melanie Schmitt1 and Matthijs A Smit2, (1)Swedish Museum of Natural History, Stockholm, Sweden, (2)University of British Columbia, Department of Earth, Ocean, and Atmospheric Sciences, Vancouver, BC, Canada
Why Are They So Darn Big? The Role of Crustal Melting in the Formation of the Gore Mountain Mega Garnets (Adirondacks, US) (533754)
Silvio Ferrero1,2, Iris Wannhoff1, Robert Darling3, Bernd Wunder4, Oscar Laurent5, Martin A Ziemann6, Christina Günter1 and Patrick J O'Brien7, (1)University of Potsdam, Institute of Geosciences, Potsdam, Germany, (2)Museum für Naturkunde, Berlin, Germany, (3)SUNY College at Cortland, Cortland, United States, (4)Helmholtz-Zentrum Potsdam GFZ, Potsdam, Germany, (5)ETH Zurich, Zurich, Switzerland, (6)Universitaet Potsdam, Potsdam-Golm, Germany, (7)University of Potsdam, Potsdam, Germany
Interlinking Deformation, Metamorphism and Magmatism in the Greater Himalayan Sequence from Bhagirathi Valley, Garhwal Himalaya, India (568911)
Aranya Sen, Wadia Institute of Himalayan Geology, Department of Geology and Geophysics, Structure and Tectonics Group, Dehradun, India and Koushik Sen, Wadia Institute of Himalayan Geology, Dehradun, India
The Role of Extension-Driven Exhumation of Deep Crust in Continental Evolution (593474)
Donna L Whitney1, Megan Korchinski2, Christian P Teyssier2 and Patrice F Rey3, (1)University of Minnesota Twin Cities, Department of Earth and Environmental Sciences, Minneapolis, MN, United States, (2)University of Minnesota, Department of Earth and Environmental Sciences, Minneapolis, MN, United States, (3)Univ of Sydney, School of Geosciences, Sydney, Australia
Active granulite-facies metamorphism in extending lower continental crust: Rio Grande Rift, NM (624334)
Jacob Henry Cipar1, Joshua Garber2 and Andrew Smye2, (1)Pennsylvania State University Main Campus, Geoscience, University Park, PA, United States, (2)Pennsylvania State University Main Campus, Department of Geosciences, University Park, PA, United States
Sediments Lurking in the Deep: Peraluminous Granulites in Lower Continental Crust (628654)
Gregory Dumond, University of Arkansas, Department of Geosciences, Fayetteville, AR, United States and Christopher Andronicos, Purdue Univ, Earth, Atmospheric, and Planetary Sciences, Lafayette, IN, United States
