Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases

Details Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3301304s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 1, CiteID L01304

Physics

23

Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineral Physics: Elasticity And Anelasticity, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

The athermal elastic constants of the perovskite and post-perovskite polymorphs of pure end-member FeSiO3 were calculated from ab initio calculations. We predict that incorporating ten mole percent FeSiO3 together with four mole percent Al2O3 into MgSiO3 reduces the perovskite to post-perovskite phase transition pressure by 5 GPa. Small changes in the seismic properties of the post-perovskite phase due to the incorporation of iron and alumina are compatible with observations for the lower mantle. MgSiO3 post-perovskite enriched in fifty percent or more iron may be responsible for ultra-low velocity zones at the base of the mantle.

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