MR41A:
Connecting Rheology, Microstructure, and Chemistry of Earth’s Mantle: New Constraints from Experiments, Observations, and Theory I


Submit an Abstract to this Session


Session ID#: 61459

Session Description:
Geophysical and chemical features of Earth’s dynamic interior display complex kinematics, enigmatic discontinuities (e.g., mid-lithospheric and lithosphere-asthenosphere discontinuities), stable cratons, as well as flow at ascending mantle plumes. These phenomena can be explained through evolution in microstructure (e.g., grain-size, crystallographic preferred orientation), the chemical environment (e.g., water content, chemistry and structure of grain-boundaries), and/or the existence of melt. In this session, we explore the effects of microstructure and chemistry, and their relationships with the viscosity and deformation mechanisms, on the tectonic history and dynamics of Earth’s mantle. We invite abstracts from a variety of scientific ventures, such as diffusion and solid-state deformation experiments, analysis of natural samples, numerical models, and theoretical studies, to shed light on the microstructural and chemical effect on the strength and tectonic evolution of planetary interiors.
Primary Convener:  Yuval Boneh, Brown University, Providence, RI, United States
Conveners:  Emily J Chin, Scripps Institution of Oceanography, Geoscience Research Division, La Jolla, United States, Jeffrey S Pigott, Los Alamos National Laboratory, Los Alamos, NM, United States and Sebastian Ritterbex, Ehime University, Matsuyama, Japan
Primary Liaison:  Yuval Boneh, Washington University in St Louis, Earth and Planetary Sciences, St. Louis, MO, United States
Chairs:  Yuval Boneh, Brown University, Providence, RI, United States and Sebastian Ritterbex, Ehime University, Matsuyama, Japan
OSPA Liaison:  Jeffrey S Pigott, Los Alamos National Laboratory, Los Alamos, NM, United States
Co-Organized with:
Mineral and Rock Physics, and Volcanology, Geochemistry and Petrology

Proposed Co-Organized Session with:
  • T - Tectonophysics
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

3620 Mineral and crystal chemistry [MINERALOGY AND PETROLOGY]
3625 Petrography, microstructures, and textures [MINERALOGY AND PETROLOGY]
3902 Creep and deformation [MINERAL PHYSICS]
8162 Rheology: mantle [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Observations of a complex interplay between melt, water, grain size, and viscous anisotropy during shear localization in the lithospheric mantle (Invited) (368031)
Jessica M Warren, University of Delaware, Earth Sciences, Newark, DE, United States, Kathryn M. Kumamoto, University of Minnesota - Twin Cities, Department of Earth and Environmental Sciences, Minneapolis, United States and Erik Hauri, Carnegie Institution for Science, Washington, DC, United States
Relationships Between Olivine LPO and Deformation Conditions in Naturally Deformed Rocks and Implications for Mantle Seismic Anisotropy (347533)
Rachel E Bernard, Amherst College, Amherst, MA, United States, Whitney M Behr, Structural Geology & Tectonics Group, Dept. of Earth & Planetary Sciences, ETH Zürich, Zürich, Switzerland, Thorsten W Becker, University of Texas at Austin, Jackson School of Geosciences, Austin, TX, United States and David J Young, Ohio State University, Columbus, OH, United States
Quantifying the influence of oxygen fugacity on the seismic properties of olivine (Invited) (345451)
Christopher Joseph Cline II, NOVA Geotechnical, Las Vegas, NV, United States, Ian Jackson, Australian Natl Univ, Canberra, Australia, Ulrich Faul, Massachusetts Institute of Technology, Earth Atmospheric and Planetary Sciences, Cambridge, MA, United States, Emmanuel David, University College London, London, United Kingdom and Andrew Berry, Australian National University, Research School of Earth Sciences, Canberra, Australia
Activation of [100](001) slip system by water incorporation in olivine (368621)
Lin Wang1, Nobuyoshi Miyajima1, Tomoo Katsura2 and Takaaki Kawazoe3, (1)University of Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany, (2)University Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany, (3)Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan
Xenolith constraints on deformation conditions and mechanisms in the lower mantle lithosphere (Invited) (354126)
Nicholas J Dygert, University of Texas at Austin, Austin, TX, United States, Rachel E Bernard, Amherst College, Amherst, MA, United States and Whitney M Behr, Structural Geology & Tectonics Group, Dept. of Earth & Planetary Sciences, ETH Zürich, Zürich, Switzerland
Small and large effective activation energies of diffusion creep in the oceanic lithosphere and asthenosphere (365418)
Takehiko Hiraga, Tadashi Nakakoji and Kosuke Yabe, Earthquake Research Institute, University of Tokyo, Tokyo, Japan
Constraining viscosity of bridgmanite under lower mantle conditions (345744)
Riccardo Reali1, Jeffrey S Pigott2, James Van Orman3, Jennifer M Jackson4, Francesca Boioli1, Philippe Carrez5 and Patrick Cordier6, (1)University of Lille 1, Villeneuve d'Ascq, France, (2)Los Alamos National Laboratory, Los Alamos, NM, United States, (3)Case Western Reserve University, Cleveland, United States, (4)California Institute of Technology, Seismological Laboratory, Pasadena, United States, (5)University of Lille, Villeneuve d'Ascq, France, (6)Université de Lille, UMET, Villeneuve d'Ascq, France
Plumes morphology in a visco-plastic mantle (Invited) (350767)
Anne Davaille1, Nicolo' Sgreva1, Riccardo Reali2, Philippe Carrez3 and Patrick Cordier4, (1)CNRS / University Paris-Sud, Laboratoire FAST, Orsay, France, (2)University of Lille 1, Villeneuve d'Ascq, France, (3)University of Lille, Villeneuve d'Ascq, France, (4)Université de Lille, UMET, Villeneuve d'Ascq, France

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