Shear response of Fe-bearing MgSiO₃ post-perovskite at lower mantle pressures Shear response of Fe-bearing MgSiO<sub>3</sub> post-perovskite at lower mantle pressures

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Author(s)

Abstract

We investigate the shear response of possible slip systems activated in pure and Fe-bearing MgSiO<sub>3</sub> post-perovskite (PPv) through <i>ab initio</i> 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 Fe<sup>2+</sup> decreases the strength of all slip systems but does not change the plastic anisotropy style. Therefore, pure and Fe-bearing MgSiO<sub>3</sub> 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 <i>V</i><sub>SH</sub> > <i>V</i><sub>SV</sub> type polarization anisotropy, being consistent with seismological observations.<BR><BR>(Communicated by Ikuo KUSHIRO, M.J.A.)

Journal

  • Proceedings of the Japan Academy, Series B

    Proceedings of the Japan Academy, Series B 89(1), 51-58, 2013

    The Japan Academy

Codes

  • NII Article ID (NAID)
    130003365105
  • NII NACSIS-CAT ID (NCID)
    AA00785485
  • Text Lang
    ENG
  • ISSN
    0386-2208
  • NDL Article ID
    024324806
  • NDL Call No.
    Z53-T495
  • Data Source
    NDL  J-STAGE 
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