1. State Key Laboratory of Geo-processes and Mineral Resources; China University of Geosciences; Wuhan 430074 China
2. Graduate School of Science and Technology; Niigata University; Niigata 950-2181 Japan
3. Research Institute of Geology and Geoinformation; Geological Survey of Japan, AIST; Tsukuba 305-8567 Japan
4. Department of Geology, Faculty of Science; Niigata University; Niigata 950-2181 Japan