*Keiko Sato¹, Hidenori Kumagai¹, Naoyoshi Iwata², Kei Okamura³, Katsuhiko Suzuki¹ (1.Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, 2.Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University, 3.Research and Education Faculty, Multidisciplinary Science Cluster, Interdisciplinary Science Unit, Kochi University)

*Ruri Kawamura¹, Keiko Sato², Hidenori Kumagai², Takeshi Hanyu², Katsuhiko Suzuki², Takahiro Tagami¹ (1.Department of Geology and Mineralogy, Division of Earth and Planetary Sciences, Graduated School of Science, Kyoto University, 2.Japan Agency for Marine-Earth Science and Technology)