1. State Key Laboratory of Geological Processes and Mineral Resources (GPMR), Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2. Hubei institute of hydrogeology and engineering geology, Jingzhou 434020, China
3. The Guangxi Zhuang Antonomous Region Geological Survey Institute, Nanning, Guangxi 530023, China
4. Guangxi Bureau of Geology & Mineral Resources, Nanning 530023, China
5. Department of Geology, University of the Free State, Bloemfontein 9301, South Africa
6. Geological Sciences, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Westville 3629, South Africa