山东省微山县郗山稀土矿床成矿年代学新进展  

New progress in the metallogenic chronology of the Chishan REE deposit in Weishan County,Shandong Province

作　　者：张鹏 刘珊珊 兰君 李衣鑫 邢楠 刘敬杰 刘袁坤 康志强[2,3] 杨锋[2,3] ZHANG Peng;LIU Shanshan;LAN Jun;LI Yixin;XING Nan;LIU Jingjie;LIU Yuankun;KANG Zhiqiang;YANG Feng(No.5 Exploration Institute of Geology and Mineral Resources,Tai′an Shandong 271000,China;College of Earth Sciences,Guilin University of Technology,Guilin Guangxi 541004,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi Guilin University of Technology,Guilin Guangxi 541004,China)

机构地区：[1]山东省地质矿产勘查开发局第五地质大队,山东泰安271000 [2]桂林理工大学地球科学学院,广西桂林541004 [3]桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西桂林541004

出　　处：《地质科技通报》2024年第1期51-62,共12页Bulletin of Geological Science and Technology

基　　金：山东省自然资源厅基金项目(鲁勘字(2018)30号);山东省地矿局科技创新项目(KC202104;KY202207);广西研究生教育创新计划项目(YCBZ2022119;YCSW2022313)。

摘　　要：山东省微山县郗山稀土矿床位于华北板块东南缘,是一个以轻稀土为主的岩浆热液型稀土矿床,目前为我国第三大轻稀土矿床,对其成矿年龄还存在争议。为此,以郗山稀土矿最新勘探钻孔矿石样品为研究对象,通过野外调查、矿物学和年代学研究,采用氟碳铈矿Th-Pb同位素定年精确厘定了郗山稀土矿的成矿年代。5件氟碳铈矿Th-Pb同位素定年结果表明,郗山稀土矿床成矿时代可分为2期:早期为(125.5±0.5)~(122.2±0.5)Ma,晚期为(112.3±0.6)Ma,其中早期年龄与前人得出的矿床成矿年龄基本一致,而晚期成矿年龄则是首次报道,表明郗山稀土矿床可能存在2期成矿活动,值得关注并开展进一步工作。[Objective]The Chishan rare earth deposit in Weishan County,Shandong Province is located on the southeastern edge of the North China Plate.It is a magmatic hydrothermal rare earth deposit mainly composed of light rare earths,and is currently the third largest light rare earth deposit in China.There is still controversy over its mineralization age.[Methods]Therefore,taking the latest exploration borehole ore samples from Chishan rare earth deposit as the research object,the mineralization age of Chishan rare earth deposit was accurately determined through field investigation,mineralogy,and chronology research,using Th-Pb isotope dating of fluorocarbon cerium ore.[Results]The Th-Pb isotope dating results of 5 fluorocarbon cerium deposits indicate that the mineralization age of the Chishan rare earth deposit can be divided into two periods:the early period is(125.5±0.5)-(122.2±0.5)Ma,and the late period is(112.3±0.6)Ma.[Conclusion]The early age is basically consistent with the mineralization age of the deposit determined by previous studies,while the late mineralization age is the first report,indicating that there may be two periods of mineralization activity in the Chishan rare earth deposit,which is worthy of attention and further work.

关 键 词：郗山稀土矿床 Th-Pb同位素定年 氟碳铈矿 微山县 山东省 

分 类 号：P618.7[天文地球—矿床学] P597[天文地球—地质学]