*Yusuke Kuwahara¹, Kazutaka Yasukawa^1,2, Koichiro Fujinaga^2,3, Tatsuo Nozaki^4,3,5,2, Junichiro Ohta^2,6,3, Honami Sato^2,4, Jun-Ichi Kimura⁶, Kentaro Nakamura¹, Yasuhiro Kato^3,1,2 (1.Department of Systems Innovation, School of Engineering, The University of Tokyo, 2.Ocean Resources Research Center for Next Generation, Chiba Institute of Technology, 3.Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo, 4.Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology , 5.Department of Planetology, Graduate School of Science, Kobe University, 6.Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology)