Institute of Deep Sea Science and Engineering Chinese Academy of Science Sanya 572000 ChinaNational Deep Sea Center Ministry of Natural Resources(MNR) Qingdao 266237 ChinaUniversity of Chinese Academy of Science Beijing 100049 China;
National Deep Sea Center Ministry of Natural Resources(MNR) Qingdao 266237 China;
Dept.of Marine Science&Technology Federal University of Technology Akure 340252 Nigeria;
magnetic property; material resource; hadal sediment; Yap Trench;