Hiroki NAGAOKA¹, *Akiko NAKAMURA¹, Ayako SUZUKI², Sunao HASEGAWA² (1.Graduate School of Science, Kobe University, 2.Institute of Space and Astronautical Science)

*Moe KAMIOKA¹, Kentaro TERADA¹, Hiroshi HIDAKA², Kosuke KIMURA², Sergey SKUBLOV³ (1.Osaka University, Department of Earth and Space Science, 2.Guraduate school of Science, Hiroshima University, 3.Institute of Precambrian Geology and Geochronology,)

Yasunari TAKAGI¹, *Takaaki NOGUCHI¹, Makoto KIMURA¹, Akira YAMAGUCHI² (1.Ibaraki University, 2.National Institute of Polar Research)

Takehiro KAWASAKI¹, *Makoto KIMURA¹, Takaaki NOGUCHI¹ (1.Faculty of Science, Ibaraki University)

*Kohei SERA¹, Hiroshi HIDAKA¹, Shigekazu YONEDA² (1.Department of Earth and Planetary Systems Science, Hiroshima University, 2.National Museum of Nature and Sci.)

*Mari KONO¹, Tomoaki KUBO¹, Takumi KATO¹, Tadashi KONDO² (1.Kyushu Univ., 2.Osaka Univ.)