Isotopic fractionation of methane with clathrate hydrate formation under the condition of ice crust/internal ocean boundary in Enceladus and Europe

Kushi Kudo1, Atsushi Tani1, Naohiro Yoshida2 and Makoto Nagasawa3, (1)Kobe University, Faculty of Human Developmant and Environment, Kobe, Japan, (2)Tokyo Institute of Technology, School of Materials and Chemical Technology, Tokyo, Japan, (3)S.T. Japan. Inc., Hirakata city, Japan