Equation of state and phase stability of mantle perovskite up to 140 GPa shock pressure and its geophysical implications

Details Equation of state and phase stability of mantle perovskite up to 140 GPa shock pressure and its geophysical implications Equation of state and phase stability of mantle perovskite up to 140 GPa shock pressure and its geophysical implications

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3104614g&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 4, CiteID L04614

Physics

6

Geochemistry: Composition Of The Mantle, Mineral Physics: Equations Of State, Mineral Physics: Physical Thermodynamics, Mineral Physics: Shock Wave Experiments, Mineral Physics: High-Pressure Behavior

Scientific paper

We performed shock wave experiments on a natural pyroxene with chemical composition close to (Mg0.92, Fe0.08)SiO3 and initial density of 3.06 g/cm3, between 48 and 140 GPa. The relationship of shock wave velocity us and particle velocity up can been described linearly by us = 3.76(+/-0.24) + 1.48(+/-0.07) up (km/s). The model Hugoniot for the assemblage of (Mg0.92, Fe0.08)O (Mw) + SiO2(St) is significantly different from the experimental data, excluding the possibility of chemical decomposition of perovskite to oxides during the shock compression. The Grüneisen parameter γ obtained by fitting the experimental data can be expressed by γ = γ0 (ρ0/ρ)q, where γ0 = 1.84(2) and q = 1.69(3). Using the third-order Birch-Murnaghan finite strain equation of state, the shock experimental data yield a zero-pressure bulk modulus K0s = 260.1(9) GPa and its pressure derivative K'0s = 4.18(4), with ρ0 = 4.19 g/cm3. A comparison of the experimental Hugoniot densities of perovskite with the PREM density profile prefers a perovskite-dominant lower mantle model.

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