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Plastic Deformation of MgGeO3 Post-Perovskite at Lower Mantle Pressures

Science  03 Feb 2006:
Vol. 311, Issue 5761, pp. 644-646
DOI: 10.1126/science.1121808

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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.

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