1. Department of Earth Sciences, Memorial University of Newfoundland , St. John's, NL A1B 3X5 , Canada
2. School of Geophysics and Geomatics, China University of Geosciences , Wuhan 430074 , China
3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences , Wuhan 430074 , China
4. Department of Geophysics, School of Earth and Space Sciences, Peking University , Beijing 100871 , China
5. College of Geology Engineering and Geomatics, Chang'an University , Xi'an 710054 , China
6. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing 100029 , China
7. College of Geo-exploration Sciences and Technology, Jilin University , Changchun 130021 , China