Effect of impurity on the elasticity of perovskite and postperovskite: Velocity contrast across the postperovskite transition in (Mg,Fe,Al)(Si,Al)O3

Details Effect of impurity on the elasticity of perovskite and postperovskite: Velocity contrast across the postperovskite transition in (Mg,Fe,Al)(Si,Al)O3 Effect of impurity on the elasticity of perovskite and postperovskite: Velocity contrast across the postperovskite transition in (Mg,Fe,Al)(Si,Al)O3

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3312s04t&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 12, CiteID L12S04

Physics

17

Geochemistry: Composition Of The Mantle, Geochemistry: Mineral And Crystal Chemistry (3620), Mineral Physics: Elasticity And Anelasticity, Mineral Physics: High-Pressure Behavior, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

We calculated the acoustic velocity contrasts between perovskite and postperovskite in MgSiO3, FeSiO3 and Al2O3 compounds, using the planewave pseudopotential method for a pressure range of the Earth's lower mantle. Both FeSiO3 and Al2O3 pv and ppv have about 20% smaller shear moduli than Mg-phases at deep mantle pressures, though the bulk moduli are comparable, consistent with previous studies. For the relative variations of shear to compressional velocities, bulk to shear velocities and density to shear velocity at constant pressure due to variations in Fe and Al content up to 20 mol%, we find RS/P of 1.5~2.2, RΦ/S of 0.1~0.4 and Rρ/S of -1.0~-0.2. Both Fe and Al influence elasticity of ppv more than that of pv. Therefore velocity contrasts across the postperovskite phase change would decrease with increasing Fe and Al content. We find that positive velocity variations are hardly produced in pv with the MORB composition.

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