School of Earth Sciences and Engineering;
Sun Yat-sen University;
Guangzhou 510275;
China;
Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering;
Guangzhou 510006;
China;
School of Marine Sciences;
Sun Yat-sen University;
Guangzhou 519275;
China;
State Key Laboratory for Mineral Deposits Research;
Nanj ing University;
Nanj ing 210046;
China;
Guangzhou Marine Geological Survey;
Guangzhou 510760;
China;