滇东南曼龙沟卡林型金矿床磷灰石LA-ICP-MS U-Pb成矿年代学研究  

The apatite LA-ICP-MS U-Pb dating of the Manlonggou Carlin-type gold deposit in the southeastern Yunnan, China

作　　者：曾礼传 杨昌毕 杨飞祥 王加昇[3] ZENG Li-chuan;YANG Chang-bi;YANG Fei-xiang;WANG Jia-sheng(Yunnan Institute of Geological Survey,Kunming 650011,China;The No.2 Geological Brigade,Bureau of Geology and Mineral Resources Exploration and Development of Yunnan Province,Wenshan,Yunnan 663000,China;Faulty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]云南省地质调查院,昆明650011 [2]云南省地质矿产勘查开发局第二地质大队,云南文山663000 [3]昆明理工大学国土资源工程学院,昆明650093

出　　处：《矿物岩石地球化学通报》2023年第1期147-156,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(41772070);云南地矿集团有限公司资助项目(滇东南浅成低温热液矿床成矿规律研究及找矿靶区预测)。

摘　　要：滇东南曼龙沟金矿床是滇东南地区代表性的卡林型金矿床,为进一步确定其成矿时代,对其中发育的两类磷灰石——与含金黄铁矿密切共生、呈细脉状集合体产出和与含金黄铁矿关系不密切、在细脉旁呈斑块状集合体产出,开展了激光剥蚀电感耦合等离子质谱仪(LA-ICP-MS)原位U-Pb定年。结果显示,与黄铁矿关系密切共生的磷灰石形成时代为(148±25)Ma(MSWD=0.64),与黄铁矿关系不密切的磷灰石形成时代为(142±69) Ma(MSWD=11.8),两组磷灰石测年结果在误差范围内基本一致,说明两者形成于相同的成矿作用过程。总体上看,曼龙沟金矿床成矿时代为~145 Ma,属于燕山早期,矿床的形成与太平洋板块向西俯冲、华南陆块岩石圈自东而西伸展有关。The Manlonggou gold deposit, a representative Carlin-type gold deposit in the southeastern Yunnan, is located in the southern part of the Yunnan-Guizhou-Guangxi "golden Triangle" metallogenic belt. The detailed mineralogical study shows that there are two types of apatite in the Manlonggou gold deposit. One is closely intergrown with auriferous pyrite and occurs as veinlet-like aggregates. The other one is not closely related to the auriferous pyrite and occurs as a patchy aggregates beside pyrite veinlets. The LA-ICP-MS in-situ U-Pb dating results of these two types of apatite show that formation ages of the apatite closely intergrown with auriferous pyrite and the apatite which is not closely related to the auriferous pyrite are(148±25)Ma(MSWD=0.64) and(142±69)Ma(MSWD=11.8), respectively. The dating results of these two groups of apatites are basically consistent within the deviation range, indicating that these apatites were formed in the same ore-forming process. Generally, the metallogenic epoch of the Manlonggou gold deposit is ~145 Ma, which belongs to the early Yanshanian. The formation of the deposit was related to the east-westward extension of the South China continental lithosphere due to the westward subduction of the Pacific plate.

关 键 词：卡林型金矿床 磷灰石 LA-ICP-MS U-Pb定年 成矿时代 云南 

分 类 号：P61[天文地球—矿床学]