Guangzhou Marine Geological Survey;
Guangzhou 510075;
China;
Second Institute of Oceanography;
State Ocean Administration;
Hangzhou 310012;
China;
China Ocean Mineral Resources R & D Association;
Beijing 100860;
China;
Beijing General Research Institute of Mining & Metallurgy;
Beijing 100070;
China;
National Marine Information Center;
Tianjin 300171;
China;