*Jun-ichi Ando¹, Takayoshi Nagaoka¹, Naotaka Tomioka², Hiroyuki Kagi³, Kaushik Das¹ (1.Department of Earth and Planetary Systems Science, Hiroshima University, 2.Kochi Institute for core sample research, Japan Agency for Marine-Earth Science and Technology, 3.Geochemical Research Center, Graduate School of Science, University of Tokyo)

*Toru Takeshita¹, Dong Van Bui¹, Thomas Anthony Czertowicz¹, Shun Arai², Takafumi Yamamoto³, Jun-ichi Ando³, Norio Shigematsu⁴, Koichiro Fujimoto⁵ (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University, 2.Department of Earth Science, Graduate School of Science, Tohoku University, 3.Department of Earth and Planetary Systems Science, Hiroshima University, 4.AIST, 5.Tokyo Gakugei University)