The State Key Lab. of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002;
China;
Key Laboratory of Margmal Sea Geology;
Guangzhou Institute of Geochemistry & South China Sea Institute of Oceanology;
Chinese Academy of Sciences;
Guangyang 510640;
China;
Graduate School of Chinese Academy of Sciences;
Beijing 100049;
China;