1. School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2. No.1 Geological Exploration Institute, Henan Bureau of Geo-exploration and Mineral Development, Zhengzhou 450001, China
3. State Key Laboratory of Geological Processes and Mineral Resources, University of Geosciences, Wuhan 430074, China
4. School of Natural Resources and Surveying, Nanning Normal University, Nanning 530001, China