title: Plastic deformation of MgGeO3 post-perovskite at lower mantle pressures.
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.
authors.affiliation: Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA. smerkel@berkeley.edu
authors.forename: Sébastien
authors.initials: S
authors.lastname: Merkel
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kubo
authors.forename: Lowell
authors.initials: L
authors.lastname: Miyagi
authors.forename: Sergio
authors.initials: S
authors.lastname: Speziale
authors.forename: Thomas S
authors.initials: TS
authors.lastname: Duffy
authors.forename: Ho-Kwang
authors.initials: HK
authors.lastname: Mao
authors.forename: Hans-Rudolf
authors.initials: HR
authors.lastname: Wenk