赣南雷公嶂钼矿床辉钼矿Re-Os年龄及其地质意义  

Re-Os dating of molybdenites from Leigongzhang molybdenum deposit of southern Jiangxi Province and its geological significance

作　　者：赵云彪 黄凡[1] 迟雷 王岩[1] 童日发 ZHAO YunBiao;HUANG Fan;CHI Lei;WANG Yan;TONG RiFa(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,CAGS,Beijing 100037,China;School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,Inner Mongolia,China;China University of Geosciences,Beijing 100083,China;Geologic Party No.264,Jiangxi Nuclear Industrial Geological Bureau,Ganzhou 341000,Jiangxi,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [2]内蒙古大学物理科学与技术学院,内蒙古呼和浩特010021 [3]中国地质大学(北京),北京100083 [4]江西省核工业地质局二六四大队,江西赣州341000

出　　处：《矿床地质》2023年第1期66-76,共11页Mineral Deposits

基　　金：国家自然科学基金(编号:42172097、41402069);中国地质调查局中国矿产地质志项目(编号:DD20221695);中央级公益性科研院所基本科研业务费项目(编号:JYYWF20183701、JYYWF20183704、K1305)共同资助。

摘　　要：雷公嶂钼矿床是赣南地区新发现的一座具中型钼矿找矿前景的独立钼矿床,成矿特征明显区别于赣南已发现的与钨多金属共(伴)生的钼矿床。为确定矿床成矿时代,文章利用高精度ICP-MS辉钼矿Re-Os同位素测年技术,首次获得了雷公嶂钼矿床的辉钼矿Re-Os同位素加权平均模式年龄,为(156.3±1.0)Ma,等时线年龄为(156.9±3.6)Ma,证实了矿床成岩与成矿作用同时发生,形成于南岭地区燕山早期中晚侏罗世(165~150 Ma)。矿床中辉钼矿的w(Re)为6.104×10-6~13.974×10-6,平均为8.507×10-6,结合矿床地质特征和成矿岩体主量元素及Hf同位素等证据,文章认为成矿物质来自地壳,没有地幔物质加入。结合赣南地区成岩与成矿年代学资料,文章认为区内钨钼多金属矿床形成于华南中生代岩石圈大规模伸展-减薄的地球动力学背景。The Leigongzhang molybdenum deposit is a newly discovered independent molybdenum deposit in the southern part of Jiangxi Province, with a medium-sized molybdenum resources. Its metallogenic characteristics are clearly distinct from those of molybdenum deposits associated with tungsten that have been found in the region. In order to determine the metallogenic age of the deposit, the Re-Os isotope analysis of molybdenite in the ore-body was performed by inductively coupled plasma mass spectrometry(ICP-MS), and the Re-Os isotope weighted average model age was(156.3±1.0) Ma, and the isochron age was(156.9±3.6) Ma, confirming that the diagenesis and mineralization of the deposit occurred simultaneously during middle-late Jurassic of the early Yanshan period(165~150 Ma). The Re content of molybdenite in the deposit is 6.104×10-6~13.974×10-6, with an average of 8.507×10-6. Combining the geological characteristics of the deposit and the evidence of the major elements and Hf isotope of the ore-forming granite, this paper concludes that the ore-forming material was come from the crust without the mantle material. Combining with the regional diagenetic and diagenetic data, this paper suggests that the regional tungsten-molybdenum deposits were formed in the geodynamic setting of lithospheric thinning and crustal extension in South China during the Mesozoic.

关 键 词：地球化学 钼矿床 RE-OS同位素 成矿年龄 雷公嶂 赣南 

分 类 号：P618.65[天文地球—矿床学]