1. Key Laboratory of Western China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences Lanzhou University Lanzhou China
2. CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing China
3. Department of Earth and Atmospheric Sciences University of Houston Houston TX USA
4. College of Chemistry and Chemical Engineering Lanzhou University Lanzhou China
5. Department of Geology and Geological Engineering Colorado School of Mines Golden CO USA