*Leonard Schirner¹、Otto A. Katharina¹、Klaus-Dieter Matz¹、Sho Sasaki²、Seiji Sugita³、Yasuhiro Yokota⁴ (1.German Aerospace Center, Institute of Planetary Research, 12489 Berlin, Germany、2.Osaka University, Deptartment of Earth and Space Science, Toyonaka 560-0043, Japan、3.University of Tokyo, Deptartment of Earth and Planetary Science, Tokyo 113-0033, Japan、4.Kochi University, Kochi 780-8520, Japan)