Elastic properties of the post-perovskite phase of Fe2O3 and implications for ultra-low velocity zones

Details Elastic properties of the post-perovskite phase of Fe2O3 and implications for ultra-low velocity zones Elastic properties of the post-perovskite phase of Fe2O3 and implications for ultra-low velocity zones

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pepi..170..260s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 170, Issue 3-4, p. 260-266.

Physics

6

Scientific paper

The properties of the post-perovskite phase of Fe2O3 have been investigated using both the generalized gradient approximation (GGA) and GGA + U methods. The low-spin post-perovskite phase is found to have monoclinic symmetry. While GGA and GGA + U predict very different spin transition pressures, bulk elastic properties are found to be similar. Linear mixing of the elastic properties of the post-perovskite phase of Fe2O3 with those previously calculated for the MgSiO3 phase shows that the properties of ferric-iron-enriched post-perovskite are compatible with seismic constraints for ultra-low velocity zones. Agreement with observations for ultra-low velocity zones is further increased if they are presumed to be hotter than normal mantle.

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