Molecular dynamics simulations of MgSiO3 enstatite and seismic discontinuity in the upper mantle

Details Molecular dynamics simulations of MgSiO3 enstatite and seismic discontinuity in the upper mantle Molecular dynamics simulations of MgSiO3 enstatite and seismic discontinuity in the upper mantle

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3213310m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 13, CiteID L13310

Physics

Geophysics

1

Exploration Geophysics: Seismic Methods (3025, 7294), Mineral Physics: Elasticity And Anelasticity, Mineralogy And Petrology: Experimental Mineralogy And Petrology

Scientific paper

The seismic velocities for three kinds of enstatite (low clinoenstatite, L-CEn orthoenstatite, OEn; and high-pressure clinoenstatite, HP-CEn), which is a major component in the upper mantle, were estimated using molecular dynamics simulations based on the interatomic potential model. The calculated seismic velocities, Vp and Vs, for OEn are slower than those of L-OEn up to 6 GPa and 1000 K. The velocities in HP-CEn are faster than those in OEn at the transition pressure between OEn and HP-CEn. Furthermore, anisotropy of the seismic velocity, in particular Vp parallel to [100] > [001] > [010], is observed. We conclude that the transitions in enstatites are related to the seismic discontinuity observed at depths less than 410 km and that enstatite is as an important a mineral as olivine for the mineralogical model and for the anisotropic propagation of seismic waves in the Earth's upper mantle.

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