1. Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing, People's Republic of China
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, People's Republic of China
3. Jiangsu Provincial Key Laboratory for NSLSCS, School of Mathematical Sciences, Nanjing Normal University, Nanjing, People's Republic of China