High-pressure and high-temperature phase relations in diopside CaMgSi2O6

Details High-pressure and high-temperature phase relations in diopside CaMgSi2O6 High-pressure and high-temperature phase relations in diopside CaMgSi2O6

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pepi..104..363o&link_type=abstract

Physics of the Earth and Planetary Interiors, v. 104, p. 363-370.

Physics

11

Scientific paper

Phase transformations in diopside Ca0.92Mg1.08Si2O6 were studied by quench experiments at pressures of 18-24 GPa and temperatures of 1000-2400 K using an MA8-type multi-anvil apparatus. At modorate temperatures, diopside decomposed into the assemblage of two components, one with MgSiO3 stoichiometry and the other with CaSiO3 stoichiometry. The MgSiO3 component crystallized into β-Mg2SiO4 + stishovite, then transformed into y-Mg2SiO4 + stishovite, MgSiO3 ilmenite, and MgSiO3 perovskite with increasing pressure. The CaSiO3 component was observed always as a glass in the recovered samples. It is likely that CaSiO3 formed the cubic perovskite-type structure under pressure. At higher temperature, diopside transformed into (Mg,Ca)SiO3 garnet and CaSiO3 perovskite, and then to MgSiO3 and CaSiO3 perovskites. The solubility of Ca into (Mg,Ca)SiO3 garnet decreases with increasing pressure. The stability field of Ca-bearing garnet is expanded to lower temperature range compared to that of pure MgSiO3 garnet. The present results clarify the phase relations of diopside to the uppermost part of the lower mantle.

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