Qin Zhou¹, Qing-Zhu Yin², Matthew Sanborn², Karen G Ziegler³, Qiu-Li Li⁴, Chun-Lai Li¹ and Yu Liu⁵, (1)National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China, (2)University of California Davis, Davis, CA, United States, (3)Univ of NM-Inst of Meteoritics, Albuquerque, NM, United States, (4)Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, (5)INSTITUTE OF GEOLOGY AND GEOPHYSICS CHINESE ACADEMY OF SCIENCES, Beijing, China