3:15 PM - 3:30 PM
*Kohei YAMASHITA1, Jinichiro MAEDA2, Masako YOSHIKAWA3, Tomoyuki SHIBATA3, Keewook Yi4 (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University, 2.Department of Natural History Sciences, Faculty of Science, Hokkaido University, 3.Beppu Geothermal Research Laboratory, Kyoto University, 4.Geochronology Team, Korea Basic Science Institute)