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

Shigeaki Ono 1 , 2 , Yoichi Nakajima 3  and Kenichi Funakoshi 4
  • 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


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 × 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.

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