State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China;
Graduate University of Chinese Academy of Sciences Beijing 100049 China;
School of Geosciences and Info-physics Engineering Center South University Changsha 410083 China;
State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan 430074 China;