*Minoru Ikehara¹, Hiroshi Sato², Masakazu Fujii³, Keiko Takehara⁴ (1.Center for Advanced Marine Core Research, Kochi University, 2.Senshu University, 3.National Institute of Polar Research, 4.Soka University)

*Hiroshi Sato¹, Masakazu Fujii², Minoru Ikehara³, Keiko Takehara⁴ (1.School of Business Administration, Senshu University, 2.National Institute of Polar Research and SOKENDAI, 3.Center for Advanced Marine Core Research, Kochi University, 4.SOKA University)

*Masakazu Fujii^1,2, Minoru Ikehara³, Hiroshi Sato⁴, Keiko Takehara⁵, Takuya Itaki⁶, Yoshifumi Nogi^1,2, Yasuyuki Nakamura⁷ (1.National Institute of Polar Research, 2.The Graduate University for Advanced Studies, SOKENDAI , 3.Center for Advanced Marine Core Research, Kochi University, 4.Senshu University, 5.SOKA University, 6.Geological Survey of Japan, AIST, 7.Japan Agency for Marine Earth Science and Technology)