2:45 PM - 3:00 PM
*Asobo nkengmatia elvis ASAAH1, Tetsuya YOKOYAMA1, Festus tongwa AKA2, Tomohiro USUI1, Takeshi KURITANI3, Mengnjo jude WIRMVEM4, Hikaru IWAMORI1, Takeshi OHBA4 (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-, 2.Institute of Mining and Geological Research, P.O. Box 4110, Yaounde, Cameroon, 3.Graduate school of Science, Osaka City University, 3-3-138 Sugimoto, Sumi Yoshi-ku, Osaka 558-8585,, 4.Department of Chemistry, School of Science, Tokai University, Hiratsuka, 259-1211, Japan)