Stability of clinopyroxene at pressure-temperature conditions of the transition region

Details Stability of clinopyroxene at pressure-temperature conditions of the transition region Stability of clinopyroxene at pressure-temperature conditions of the transition region

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...86...25c&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 86, Issue 1-3, p. 25-34.

Physics

24

Scientific paper

The stability of diopside at conditions of 16-19 GPa and 1250-1900°C was determined using a 6-8 type multi-anvil apparatus. At pressures of 17-18 GPa, diopside undergoes a decomposition reaction to an assemblage of CaSiO3-perovskite + (Ca,Mg)SiO3-garnet or -ilmenite, depending on temperature. The Clapeyron slope for the breakdown reaction: ? is -2 MPa K-1. When coupled with a re-examination of clinopyroxene stability in other more complex peridotite systems, the experimental data are consistent with a recent proposal that the 520 km discontinuity in the transition region is caused by the exsolution of CaSiO3-rich perovskite from garnet, rich in majorite component.
Present Address: School of Earth and Ocean Sciences, Univeristy of Victoria, P.O. Box 1700, Victoria, B.C., V8W 2Y2 Canada

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