Affiliation: | TANG ZHONG-LI YANG JIE-DONG XU SHI-JIN TAO XIAN-CONG LI WEN-YUAN (Bureau of Geology and Mineral Resources of Gansu Province, Lanzhou 730000, PRC) Center of Modern Analysis, Nanjing University, Nanjing 210008, PRC. Department of Earth Science, Nanjing University, Nanjing 210008, PRC. |