作者单位:Chengjun Liu,Youxin Chen,Tong Xu(School of Earth Science and Resources,Chang’an University,Xi’an,Shaanxi,710054,China)Xianzhi Pei,Zuochen Li,Ruibao Li(School of Earth Science and Resources,Chang’an University,Xi’an,Shaanxi,710054,China;Key Laboratory of Western Mineral Resources and Geological Engineering of Education,Xi’an,Shaanxi,710054,China)