*WEI DU^1,2,3、Vincenzo Stagno^2,3、Hiroaki Ohfuji²、Masayuki Nishi^2,3、Tetsuo Irifune^2,3 (1.School of Earth and Space Sciences, Peking University, Beijing 100871, China、2.Geodynamic Research Center, Ehime University, Matsuyama 790-8577, Japan、3.Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo 152-8550, Japan)