1. School of Geosciences, Key Laboratory of Deep Oil and Gas, Laboratory for Marine Mineral Resources, and National Laboratory for Marine Science and Technology,China University of Petroleum, Qingdao, China.
2. School of Geosciences, Key Laboratory of Deep Oil and Gas, Laboratory for Marine Mineral Resources, and National Laboratory for Marine Science and Technology, China University of Petroleum, Qingdao, China. (corresponding author)
3. School of Geosciences, Key Laboratory of Deep Oil and Gas, Laboratory for Marine Mineral Resources, and National Laboratory for Marine Science and Technology, China University of Petroleum, Qingdao, China.
4. School of Geosciences, Key Laboratory of Deep Oil and Gas, Laboratory for Marine Mineral Resources, and National Laboratory for Marine Science and Technology,China University of Petroleum, Qingdao, China. (corresponding author)