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  • Title: Plastic deformation of MgGeO3 post-perovskite at lower mantle pressures.
    Author: Merkel S, Kubo A, Miyagi L, Speziale S, Duffy TS, Mao HK, Wenk HR.
    Journal: Science; 2006 Feb 03; 311(5761):644-6. PubMed ID: 16456075.
    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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