*Dyuti Prakash Sarkar¹, Jun-ichi Ando¹, Kaushik Das¹, Gautam Ghosh², Prabir Dasgupta³ (1.Hiroshima University, 2.Presidency University, 3.Durgapur Govt. College)

*Jun-ichi Ando¹, Naotaka Tomioka², Hiroyuki Kagi³, Kaushik Das¹ (1.Department of Earth and Planetary Systems Science, Hiroshima University, 2.Kochi Core Center, JAMSTEC, 3.Geochemical Research Center, Graduate School of Science, University of Tokyo)

*Toru Takeshita¹, Dong Van Bui¹, Jun-ichi Ando² (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University, 2.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University)

*Huang Wencheng¹, toru Takeshita¹, Thomas Jing Yi Yeo ¹, Jun-Ichi Ando² (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University, 2.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University)

*Kota Kojima¹, Jun-ichi Ando¹, Kaushik Das¹, Naotaka Tomioka² (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)