Plastic deformation of MgGeO3 post-perovskite at lower mantle pressures |
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Authors: | Merkel Sébastien Kubo Atsushi Miyagi Lowell Speziale Sergio Duffy Thomas S Mao Ho-Kwang Wenk Hans-Rudolf |
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Institution: | Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA. smerkel@berkeley.edu |
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Abstract: | Polycrystalline MgGeO3 post-perovskite was plastically deformed in the diamond anvil cell between 104 and 130 gigapascals confining pressure and ambient temperature. In contrast with phenomenological considerations suggesting (010) as a slip plane, lattice planes near (100) became aligned perpendicular to the compression direction, suggesting that slip on (100) or (110) dominated plastic deformation. With the assumption that silicate post-perovskite behaves similarly at lower mantle conditions, a numerical model of seismic anisotropy in the D' region implies a maximum contribution of post-perovskite to shear wave splitting of 3.7% with an oblique polarization. |
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