Plastic deformation of MgGeO3 post-perovskite at lower mantle pressures

Sébastien Merkel, Atsushi Kubo, Lowell Miyagi, Sergio Speziale, Thomas S. Duffy, Ho Kwang Mao, Hans Rudolf Wenk

Research output: Contribution to journalArticlepeer-review

134 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)644-646
Number of pages3
JournalScience
Volume311
Issue number5761
DOIs
StatePublished - Feb 3 2006

All Science Journal Classification (ASJC) codes

  • General

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