*Yui Kouketsu¹, Kazushi Sadamoto¹, Hayato Umeda², Hirokazu Kawahara³, Takayoshi Nagaya⁴, Tomoki Taguchi⁵, Hiroshi Mori⁶, Simon Richard Wallis⁴, Masaki Enami⁷ (1.Department of Earth & Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, 2.DOWA Metals & Mining Co., Ltd., 3.Japan Oil, Gas and Metals National Corporation (JOGMEC), 4.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 5.Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, 6.Faculty of Science, Shinshu University, 7.Nagoya University)

*Takayoshi Nagaya¹, Simon Richard Wallis¹, Kazuhiro Kawahara², Shunsuke Endo³, Hiroshi Mori⁴, Yoshihiro Asahara⁵ (1.Graduate School of Science, The University of Tokyo, 2.Japan Oil, Gas and Metals National Corporation, 3.Shimane University, 4.Shinshu University, 5.Nagoya University)