[1] Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, 932 Lushan South Road, Changsha,410083, China
[2] School of Geosciences and Info-Physics, Central South University, 932 Lushan South Road, Changsha,410083, China
[3] Geological Survey Institute of Hunan Province, Changsha,410083, China