1. Earth and Environmental Science Area, Energy Geosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. CAS Key Laboratory of Crust-Mantle Materials and Environment, University of Science and Technology of China, 96 Jinzhai RD., Hefei, Anhui 230026, China
3. Department of Earth and Planetary Science, University of California, Berkeley, California 94720, United States