Orthorhombic perovskite phases observed in olivine, pyroxene and garnet at high pressures and temperatures

Details Orthorhombic perovskite phases observed in olivine, pyroxene and garnet at high pressures and temperatures Orthorhombic perovskite phases observed in olivine, pyroxene and garnet at high pressures and temperatures

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pepi...11..289l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 11, Issue 4, p. 289-298.

Physics

24

Scientific paper

Ferromagnesian silicate olivines, pyroxenes and garnets with Mg/(Mg + Fe)>~0.3 (molar) have been found to transform to high-pressure phases characterized by the orthorhombic perovskite structure when compressed to pressures above 250 kbar in a diamond-anvil press and heated to temperatures above 1,000°C with a YAG laser. The zero-pressure density of the perovskite phase of (Mg,Fe)SiO3 is about 3-4% greater than that of the close-packed oxides, rocksalt plus tishovite. For (Mg,Fe)2SiO4 compounds, the perovskite plus rocksalt phase assemblage is 2-3% denser than the mixed oxides. The experimental synthesis of such high-density perovskite phases in olivine, pyroxene and garnet compounds suggests that s(Mg,Fe)SiO3-perovskite is the dominant mineral phase in the searth's lower mantle.

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