*Tatsuji Nishizawa¹, Hitomi Nakamura^1,2,3, Tatiana Churikova⁴, Boris Gordeychik⁵, Osamu Ishizuka^6,7, Hikaru Iwamori^1,2 (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology, 3.Chiba Institute of Technology, ORCeNG, 4.Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, 5.Institute of Experimental Mineralogy, Russian Academy of Sciences, 6.Geological Survey of Japan, AIST, 7.R & D Center for Ocean Drilling Science, Japan Agency for Maine-Earth Science and Technology )