*Jian Li^1,2、Jianxin Liu^1,2、Yasuo Ogawa³、Rongwen Guo^1,2、Yongfei Wang¹、Gangqiang Yang¹ (1.Central South University, School of Geosciences and Info-Physics, Changsha, China、2.Central South University, Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha, China、3.Tokyo Institute of Technology, Volcanic Fluid Research Center, Tokyo, Japan)