Fanchang Meng^1,2, Yinshuang Ai^1,3 and Tao Xu^3,4, (1)Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, (2)University of Chinese Academy of Sciences, Beijing, China, (3)CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China, (4)State Key Laboratory of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China