1. a State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences , Nanjing University , 210093 , PR China
2. b East China Mineral Exploration and Development Bureau for Non-Ferrous Metals , Daguang Road 26, Nanjing , 210007 , PR China
3. c School of Earth and Environment, The University of Western Australia , Crawley , 6009 , WA , Australia