11:45 AM - 12:00 PM
*Satoshi Yoshimaru1, Shoichi Kiyokawa1, Takashi Ito2, Minoru Ikehara3, Kenji Horie4, Mami Takehara4, Takashi Sano5, Frank K Nyame6, George M Tetteh7 (1.Department of Earth and Planetary Science, Kyushu University, 2.Ibaraki University, 3.Kochi University, 4.National Institute of Polar Resarch, 5.National Museum of Nature and Science, 6.University of Ghana, 7.University of Mining and Technology)