*Takuya Echigo¹, Yoichiro Saito², Mitsuyoshi Kimata³, Masahiro Shimizu³, Norimasa Nishida⁴, Shigeru Takizawa⁵ (1.Faculty of International Resource Sciences, Akita University, 2.Master's Program in Science and Engineering, University of Tsukuba, 3.Doctoral Program in Earth Evolution Sciences, Graduate School of Life and Environmental Sciences, University of Tsukuba, 4.Chemical Analysis Division, Research Facility Center for Science and Technology, University of Tsukuba, 5.National Research Institute for Earth Science and Disaster Prevention)