Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2008 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R8-10
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Host: Japan Association of Mineralogical Sciences

R8: Mineral Sciences in the Earth's interior
High-pressure stability field of CAS-phase in the system CaO-Al2O3-SiO2
*Masaki Akaogi, Maiko Haraguchi, Masato Yaguchi, Hiroshi Kojitani
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Keywords: CAS phase, Ca-perovskite, calorimetry, high-pressure phase relation
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Abstract
High pressure experiments and calorimetric measurements were performed to clarify the stability field of CaAl4Si2O11 CAS-phase. It was shown that CAS-phase is stable above about 13 GPa and 1100°C. Combining the measured enthalpy data with published ones, dissociation boundary of CAS-phase into a mixture of Ca-perovskite, corundum and stishovite was calculated. Assuming reasonable geotherms, it was concluded that CAS-phase is stable in the transition zone and upper part of the lower mantle.
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© 2008 Japan Association of Mineralogical Sciences
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Abstracts of Papers Presented at the Annual Meeting of The Japanese Association of Mineralogists, Petrologists and Economic Geologists

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