Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..943d&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 7, p. 943-946
Physics
9
Mineral Physics, Mineral Physics: Elasticity And Anelasticity, Mineral Physics: High-Pressure Behavior, Geochemistry: Composition Of The Mantle
Scientific paper
We investigate the athermal high pressure behavior of the elastic properties of MgSiO3 ilmenite up to 30 GPa using the ab initio pseudopotential method. Our results at zero pressure are in good agreement with single-crystal elasticity measurements. The elastic anisotropy is shown to decrease slightly under compression and hence to remain substantial (25 to 20% shear wave anisotropy and 16 to 10% longitudinal wave anisotropy) over the pressure regime studied. The directions of fastest and slowest wave propagation are found to change slightly with pressure as determined by the pressure dependence of c14 and c25. Comparisons with the elastic behavior of other deep transition zone phases such as ringwoodite and garnet show that ilmenite is likely to be the fastest and most anisotropic mineral in this region. Large contrasts (~10%) in velocities and densities between ilmenite and garnet are suggested to be significant for the interpretation of lateral structure in the transition zone.
Da Silva Cesar R. S.
Karki Bijaya B.
Stixrude Lars
Wentzcovitch Renata M.
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