title: Shear response of Fe-bearing MgSiO(3) post-perovskite at lower mantle pressures.
abstract: We investigate the shear response of possible slip systems activated in pure and Fe-bearing MgSiO(3) 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 Fe(2+) decreases the strength of all slip systems but does not change the plastic anisotropy style. Therefore, pure and Fe-bearing MgSiO(3) 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 V(SH) > V(SV) type polarization anisotropy, being consistent with seismological observations.(Communicated by Ikuo KUSHIRO, M.J.A.).
authors: Geodynamics Research Center, Ehime University, Ehime, Japan.
authors: Arnaud
authors: A
authors: Metsue
authors: Taku
authors: T
authors: Tsuchiya
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D017633:Magnesium Silicates / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D011312:Pressure; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D017633:Magnesium Silicates; D010087:Oxides; C059910:perovskite; D014025:Titanium