Shear response of Fe-bearing MgSiO3 post-perovskite at lower mantle pressures

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概要

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• We investigate the shear response of possible slip systems activated in pure and Fe-bearing MgSiO3 post-perovskite (PPv) through ab initio generalized stacking fault (GSF) energy calculations. Here we show that the [100](001) slip system has the easiest response to plastic shear among ten possible slip systems investigated. Incorporation of Fe2+ decreases the strength of all slip systems but does not change the plastic anisotropy style. Therefore, pure and Fe-bearing MgSiO3 PPv should demonstrate similar LPO patterns with a strong signature of the [100](001) slip system. An aggregate with this deformation texture is expected to produce a VSH > VSV type polarization anisotropy, being consistent with seismological observations.<BR><BR>(Communicated by Ikuo KUSHIRO, M.J.A.)

著者

• Tsuchiya Taku

  Geodynamics Research Center Ehime University

• METSUE Arnaud

  Geodynamics Research Center, Ehime University

関連論文

• First principles prediction of new high-pressure phase of InOOH
• Shear response of Fe-bearing MgSiO3 post-perovskite at lower mantle pressures

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