1. China University of Petroleum (East China), Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao, China.
2. China University of Petroleum (East China), Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao, China and Qingdao National Laboratory for Marine Science and Technology, Laboratory for Marine Mineral Resources, Qingdao, China.
3. China University of Petroleum (East China), Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao, China and Qingdao National Laboratory for Marine Science and Technology, Laboratory for Marine Mineral Resources, Qingdao, China. (corresponding author)
4. National Institute of Oceanography and Applied Geophysics — OGS, Trieste, Italy.