T13D:
The Microphysics of Plate Boundary Formation Posters

Submit an Abstract to this Session



Session ID#: 25677

Session Description:
Knowing how and why plate tectonics began is critical for understanding Earth’s surface and interior evolution, as well as that of other planets. However, it remains a mystery how plate driving forces overcome the apparent rheological strength of the lithosphere, and thereby initiate rifts, strike-slip boundaries and subduction zones. Experimental, theoretical and modeling studies, as well as observational field data, have generated various hypotheses regarding mechanisms for strain localization and weakening of the lithosphere. Microphysical rock deformation processes - including mobility and recovery of crystalline defects, mechanics of faults and fractures, evolution of grain size and the presence of multiple phases - are of fundamental importance in advancing and testing these hypotheses.

This session invites presentations about the development and application of rock mechanics models emerging from theoretical, experimental, numerical and observational field studies, which further our understanding of formation and evolution of plate tectonics.

Primary Convener:  Elvira Mulyukova, Northwestern University, Earth and Planetary Sciences, Evanston, IL, United States
Conveners:  Andrew J Cross, Washington University in St Louis, St. Louis, United States and Jennifer Girard, Yale University, Geology & Geophysics, New Haven, CT, United States
Chairs:  Jennifer Girard, Yale University, Earth and Planetary Sciences, New Haven, United States and Elvira Mulyukova, Northwestern University, Earth and Planetary Sciences, Evanston, IL, United States
OSPA Liaison:  Jennifer Girard, Yale University, Earth and Planetary Sciences, New Haven, United States
Co-Organized with:
Tectonophysics, and Mineral and Rock Physics

Cross-Listed:
  • EP - Earth and Planetary Surface Processes
  • MR - Mineral and Rock Physics
  • P - Planetary Sciences
Index Terms:

3902 Creep and deformation [MINERAL PHYSICS]
5112 Microstructure [PHYSICAL PROPERTIES OF ROCKS]
8120 Dynamics of lithosphere and mantle: general [TECTONOPHYSICS]
8159 Rheology: crust and lithosphere [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Grain- to multiple-grain-scale deformation processes during diffusion creep (Invited) (222829)
Takehiko Hiraga, Genta Maruyama and Tadashi Nakakoji, Earthquake Research Institute, University of Tokyo, Tokyo, Japan
Rates of Olivine Grain Growth in ‘Damp’ Natural Dunites During Dynamic Recrystallization and Post-deformation Annealing (236314)
Pamela A Speciale, University of Texas at Austin, Department of Geological Sciences, Austin, TX, United States, Whitney M Behr, Structural Geology & Tectonics Group, Dept. of Earth & Planetary Sciences, ETH Zürich, Zürich, Switzerland, Greg Hirth, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States and Leif Tokle, Structural Geology and Tectonics Group, Geological Institute, ETH Zurich, Zurich, Switzerland, Zurich, Switzerland
Evolution of Plate Tectonics on Earth since the Mid-Mesoarchean was Controlled by Sedimentary Fluxes from Continents to Oceans and Mantle Temperature (270399)
Stephan V Sobolev, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Geodynamic Modelling Section, Potsdam, Germany and Michael Brown, University of Maryland, College Park, Laboratory for Crustal Petrology, Department of Geology, College Park, United States
Grain-damage, grain-mixing and plate boundary generation (247983)
David Bercovici, Yale University, Earth & Planetary Sciences, New Haven, CT, United States
On the competing affects of shear heating and grainsize reduction in lithospheric shear zone formation (242959)
Bradford J Foley, Pennsylvania State University Main Campus, University Park, PA, United States
Metamorphism and Shear Localization in the Oceanic and Continental Lithosphere: A Local or Lithospheric-Scale Effect? (Invited) (231641)
Laurent Montesi, University of Maryland College Park, College Park, MD, United States
Subduction Initiation under Unfavorable Conditions and New Fault Formation (255266)
Xiaolin Mao, California Institute of Technology, Pasadena, CA, United States, Michael Gurnis, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States and Dave May, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Deformation Partitioning: The Missing Link Between Outcrop-Scale Observations And Orogen-Scale Processes (236224)
Snir Attia, University of Southern California, Los Angeles, CA, United States, Scott R Paterson, Univ Southern California, Los Angeles, CA, United States, Dazhi Jiang, University of Western Ontario, London, ON, Canada and Robert B Miller, San Jose State Univ, San Jose, CA, United States
Phase Mixing and Grain-Scale Physical Processes in Olivine + Ferropericlase Aggregates (260707)
Harison Wiesman, University of Minnesota Twin Cities, Earth and Environmental Sciences, Minneapolis, MN, United States, Mark E Zimmerman, Univ Minnesota, Minneapolis, MN, United States and David L Kohlstedt, University of Minnesota Twin Cities, Minneapolis, MN, United States
Searching for Hysteresis in Models of Mantle Convection with Grain-Damage (241250)
Rishap Lamichhane, Howard University, Washington, DC, United States and Bradford J Foley, Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Controls on rheology of peridotite at a palaeosubduction interface: a transect across the base of the Oman-UAE ophiolite (275475)
Tyler K Ambrose1, David Wallis2, Lars N Hansen1, David J Waters1 and Michael P. Searle1, (1)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, (2)University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Collapse of Passive Margins by Lithospheric Damage and Plunging Grain Size (289753)
Elvira Mulyukova, Northwestern University, Earth and Planetary Sciences, Evanston, IL, United States and David Bercovici, Yale University, Earth & Planetary Sciences, New Haven, CT, United States

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