Shota Shimizu¹, Sakiko Kikuchi², *Tomoki Nakamura¹, Megumi Matsumoto¹, Takazo Shibuya², Cecile Engrand³, Jean Duprat³ (1.Department of Earth and Planetary Materials Sciences, Faculty of Science, Tohoku University, 2.JAMSTEC, 3.CSNSM, Université Paris-Sud)