LI Jian-wu 1,2, CHEN Yong 3, WANG Gao-shang 2, CHEN Ji-shen 2
(1. School of Earth and Space Sciences, Peking University, Beijing 100871, China;
2. Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing 100037, China;
3. Jiangxi Application Technology College, Ganzhou 341000, China)