1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2. Nevada Bureau of Mines and Geology, University of Nevada, Reno, NV 89557, USA
3. Department of Earth and Atmospheric Sciences, University of Houston, TX 77204, USA
4. Department of Geosciences, Idaho State University, Pocatello, ID 83209-8072, USA