1. School of Earth Sciences and Resources, China University of Geosciences, Beijing, China
2. Exploration Institute of Geology and Mineral Resources of Qinghai Province, Xining, China
3. College of Geography and Tourism, Hunan University of Arts and Science, Changde, China
4. School of Earth Sciences and Gansu Key Laboratory of Mineral Resources in Western China, Lanzhou University, Lanzhou, PR China