*Mitsuhiro Nagata¹, Ouhiko Miyawaki¹, Tatsuo Kanamaru¹, Sota Niki², Takafumi Hirata³, Shinji Takeuchi¹ (1.Department of Earth and Environmental Sciences, College of Humanities and Sciences, Nihon University, 2.Division for Chronological Research, Institute for Space-Earth Environmental Research, Nagoya University, 3.Geochemical Research Center, The University of Tokyo)

*Hikaru Sawada^1,6, Ryosuke Oyanagi^2,6, Mitsuhiro Nagata³, Sota Niki⁴, Takafumi Hirata⁵ (1.University of Toyama, 2.Kokushikan University, 3.Nihon University, 4.Nagoya University, 5.The University of Tokyo, 6.JAMSTEC)

*Mitsuhiro Nagata¹ (1.Department of Earth and Environmental Sciences, College of Humanities and Sciences, Nihon University)

*Kazuya Shimooka¹, Mitsuhiro Nagata², Yasuhiro Ogita^3,4, Toshiro Takahashi⁵, Kenichiro Tani⁶, Motohiro Tsuboi¹, Satoshi SAITO⁷ (1.Kwansei Gakuin University, 2.Nihon University, 3.Japan Atomic Energy Agency, 4.Kumamoto University, 5.Niigata University, 6.National Museum of Nature and Science , 7.Ehime University)