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In situ observation of the decomposition of kyanite at high pressures and high temperatures

¹ Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
² Department of Earth Science, University College London, Gower Street, London WC1E 6BT, U.K.
³ Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
⁴ Japan Synchrotron Radiation Research Institute, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan

Correspondence: ^* E-mail: sono{at}jamstec.go.jp

In situ observations of the decomposition of kyanite, Al₂SiO₅, were carried out in a multi-anvil high-pressure apparatus using synchrotron radiation, where the phase change from kyanite to stishovite + corundum was observed at high pressures and high temperatures. The phase boundary of this decomposition at T = 1200–1900 K and P = 5–15 GPa was determined to be, P (GPa) = 10.2 + 0.0016 x T (K). Previous studies using the quench method showed a discrepancy in the transition pressure of the decomposition. Our results using in-situ observations resolve this dispute.

Key Words: Phase transition • kyanite • high pressure • X-ray diffraction