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Elasticity of post-perovskite MgSiO3
Department of Chemical Engineering and Materials Science, Minnesota Supercomputing Institute for Digital Technology and Advanced Computation, University of Minnesota, Minneapolis, Minnesota, USA
Department of Chemical Engineering and Materials Science, Minnesota Supercomputing Institute for Digital Technology and Advanced Computation, University of Minnesota, Minneapolis, Minnesota, USA
Department of Chemical Engineering and Materials Science, Minnesota Supercomputing Institute for Digital Technology and Advanced Computation, University of Minnesota, Minneapolis, Minnesota, USA
Department of Chemical Engineering and Materials Science, Minnesota Supercomputing Institute for Digital Technology and Advanced Computation, University of Minnesota, Minneapolis, Minnesota, USA
We have determined by first principles the athermal elastic constant tensor, single crystal and aggregated acoustic velocities, and anisotropy of the recently discovered post-perovskite MgSiO3 polymorph. This phase may be the most abundant mineral in the D″ region. We find that the post-perovskite phase has similar bulk modulus and larger shear modulus than perovskite at relevant pressures. This phase is remarkably anisotropic. Analyses of horizontal shear wave splittings in transversely isotropic aggregates indicate that diverse lattice preferred orientations could produce large variation in anisotropy consistent with seismic observations in D″.
Received 16 April 2004; accepted 16 June 2004; published 17 July 2004.
Citation: (2004), Elasticity of post-perovskite MgSiO3, Geophys. Res. Lett., 31, L14603, doi:10.1029/2004GL020278.
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