R3: High-pressure science and deep Earth’s material

[R3-11] Back-transformation kinetics in high-pressure minerals

*Tomoaki Kubo¹, Ko Kamura¹, Masahiro Imamura¹, Yoshinori Tange², Yuji Higo², Masaaki Miyahara³ (1. Kyushu Univ., 2. JASRI, 3. Hiroshima Univ.)

Keywords:high-pressure mineral, back-transformation, kinetics, shocked meteorite, diamond inclusion

High-pressure minerals stable at deep mantle pressures have been naturally found on Earth such as shocked meteorites and diamond inclusions, which provides important constraints on processes of planetary collisions and deep mantle dynamics. Because the timescales are limited in these dynamic processes, the reactions often remain incomplete and/or metastable state. Additionally, backward reactions to the low-pressure phases possibly occur. Here we present some experimental results on kinetics of the back-transformation.