作者单位:Ma Pengfei,Wang Chengshan,Li Yalin,Zhang Xiaolong(State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)Wang Licheng(Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 10003 7, China)