1. China University of Geosciences, Key Laboratory of Geological Survey and Evaluation of Ministry of Education, Wuhan, China.
2. Shanxi Institute of Technology, Department of Earth Science and Engineering, Yangquan, China.
3. China University of Geosciences, Key Laboratory of Geological Survey and Evaluation of Ministry of Education, Wuhan, China and China University of Geosciences, School of Geophysics and Geomatics, Wuhan, China. (corresponding author)