2017•Journal of Mineralogical and Petrological SciencesOpen access
Stability field of phase Egg, AlSiO3OH at high pressure and high temperature: possible water reservoir in mantle transition zone
Ko Fukuyama, Eiji Ohtani, Yuki Shibazaki, Hiroyuki Kagi, Akio Suzuki
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Abstract
High–pressure and high–temperature experiments were conducted to determine the stability field of phase Egg, AlSiO3OH, in the pressure range of 16.5–23.5 GPa and in the temperature range of 800–1500 °C. We found that phase Egg decomposes to δ–AlOOH + stishovite below ~ 1200 °C (16.5 GPa and 800 °C; 20.6 GPa and 1000 °C) and to Al–phase D + corundum + stishovite above ~ 1200 °C (21.8 GPa and 1500 °C) at P–T conditions corresponding to the mantle transition zone.
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