1. School of Earth Science and Resources China University of Geosciences Beijing 100083 China
2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China
3. No.6 Geological party Tibet bureau of Geology and Mineral Exploration and Development Lhasa 851400 China
4. Tibet Shengyuan Mining Group Co., Ltd. Lhasa 851400 China