Shear response of Fe-bearing MgSiO(3) post-perovskite at lower mantle pressures

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...

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Detalles Bibliográficos
Autores principales: METSUE, Arnaud, TSUCHIYA, Taku
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Japan Academy 2013
Materias:
Original Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3611955/
https://www.ncbi.nlm.nih.gov/pubmed/23318681
http://dx.doi.org/10.2183/pjab.89.51
Descripción
Sumario: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.

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