1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering; Nanjing University; Nanjing 210093 P.R.China
2. Collaborative Innovation Center of South China Sea Studies; Nanjing University; Nanjing 210093 P.R.China
3. State Key Laboratory of Geological Processes and Mineral Resources; China University of Geosciences; Wuhan 430074 P.R.China
4. Faculty of Earth Resources and Collaborative Innovation Center for Scarce and Strategic Mineral Resources; China University of Geosciences; Wuhan 430074 P.R.China