[R3-07] The effect of water on the high-pressure phase transition of pyroxene–garnet system | 2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

Sep 15 - Sep 19, 2021Online

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2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

Sep 15 - Sep 19, 2021Online

[R3-07]The effect of water on the high-pressure phase transition of pyroxene–garnet system

*Yasushi Ueno¹, Toru Inoue¹, Masamichi Noda², Sho Kakizawa¹, Takaaki Kawazoe¹, Tomoko Sato¹, Toru Shinmei³, Tetsuo Irifune³, Koji Ohara⁴(1. Hiroshima Univ. Adv. Sci. Eng., 2. Hiroshima Univ. Sci., 3. Ehime Univ. GRC, 4. JASRI)

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Keywords:

pyroxene-garnet system,bulk glass,wet condition,garnet-bridgmanite,akimotoite-bridgmanite

We conducted high pressure and high temperature experiments in the pyroxene-garnet system under anhydrous and hydrous conditions. We used glass rod and oxide mixture as the starting materials for dry and wet conditions, respectively. As a result, the akimotoite - bridgmanite boundary shifted to lower pressure side by the effect of water. In addition, the amount of Al₂O₃ in garnet was much larger than that in previous studies. Further investigation of this result is in progress.

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