1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, PR China
2. Geophysical and Geochemical Survey Institute of Hunan Province, Changsha 410014, PR China
3. Wuhan Centre of China Geological Survey, Wuhan 430223, PR China
4. Resource Exploration Department, The First Exploration Team of Shandong Coalfield Geologic Bureau, Qingdao 266000, PR China