MLR Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences,Beijing 100037, China; 2. The 8th Institute of Geology and Mineral exploration of Shandong Province, Rizhao 276826, Shandong, China ; 3. Shandong Geological Prospecting Institute, China Chemical Geology and Mine Bureau, Ji’nan 250013, Shandong, China;4. Weihai International Economic & Technical Cooperative Co., Ltd. Weihai 264200, Shandong, China; 5. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100029, China