| 赣南兴国县见龙铜钨矿床U-Pb和Re-Os同位素定年：对成岩成矿时代的限定 |
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| 引用本文： | 杨斌,赵磊,陈正乐,莫火华,鲁捷,谭友.赣南兴国县见龙铜钨矿床U-Pb和Re-Os同位素定年：对成岩成矿时代的限定[J].中国地质,2021,48(2):495-506. |
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| 作者姓名： | 杨斌 赵磊 陈正乐 莫火华 鲁捷 谭友 |
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| 作者单位： | 江西省地质矿产勘查开发局赣南地质调查大队, 江西 赣州 341000;中国地质科学院地质力学研究所, 北京 100081 |
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| 基金项目： | 中国地质调查局项目（DD2016005206）资助。 |
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| 摘 要： | 江西省兴国县见龙铜钨矿床位于南岭东西向构造-岩浆岩带东端与武夷山隆起带西侧之雩山坳陷带交汇部位,是赣南地区新近发现的铜(钨)多金属矿床。矿体产于佛子山岩体与震旦系浅变质岩的内、外接触带内,包括石英脉型矿化和云英岩型矿化。前人对本矿床鲜有研究,文章基于详细的野外地质调查,分别采用LA-ICP-MS锆石U-Pb法和辉钼矿Re-Os等时线法对见龙铜钨矿细粒黑云母花岗岩和云英岩中的辉钼矿进行精确定年。获得花岗岩单颗粒LA-ICP-MS锆石U-Pb加权平均年龄值为(154.2±1.7)Ma,云英岩型矿体的辉钼矿Re-Os等时线加权平均年龄为(155.9±1.2)Ma。研究表明成岩与成矿作用几乎同时发生,厘定矿床成岩成矿时代为晚侏罗世。见龙铜钨矿与区内已知的画眉坳、张家地和岩前等钨矿床成岩成矿时代相近。结合前人资料,进一步证实南岭东段钨多金属矿床主要形成于170～150 Ma。矿石中辉钼矿的铼含量为6.484×10~(-6)～21.346×10~(-6),结合硫同位素分析结果,综合分析认为矿床成矿物质来源于壳幔混合。
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| 关 键 词： | 铜钨矿床 地质特征 成岩成矿时代 矿产勘查工程 见龙 赣南 |
| 收稿时间： | 2019/6/2 0:00:00 |
| 修稿时间： | 2020/1/29 0:00:00 |
U-Pb and Re-Os dating of the Jianlong Cu-W deposit in Xingguo County of southern Jiangxi Province: constraint on its petrogenic and metallogenetic ages |
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| YANG Bin,ZHAO Lei,CHEN Zhengle,MO Huohu,LU Jie,TAN You.U-Pb and Re-Os dating of the Jianlong Cu-W deposit in Xingguo County of southern Jiangxi Province: constraint on its petrogenic and metallogenetic ages[J].Chinese Geology,2021,48(2):495-506. |
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| Authors: | YANG Bin ZHAO Lei CHEN Zhengle MO Huohu LU Jie TAN You |
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| Institution: | South Jiangxi geological Survey Party of JBEDGMR, Ganzhou 341000, Jiangxi, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | The Jianlong Cu-W deposit, as a newly discovered one in southern Jiangxi Province, is located at the convergent zone of the eastern Nanling EW-trending tectono-magmatic belt and Yushan depression of the western Wuyishan uplift belt. The ore bodies, including mineralized quartz vein and greisen, are hosted in the inner and outer contacts between Fozishan granite and Sinian epimetamorphic rocks. Based on the LA-ICP-MS zircon U-Pb and molybdenite Re-Os isochron dating, the ages of the granule biotite granite and the molybdenite in greisen were accurately determined. The weighted average age of single-grain LA-ICP-MS zircon U-Pb of granite is 154.2±1.7 Ma, and the Re-Os isochron ages of molybdenite is 155.9±1.2 Ma. The study results suggest that diagenesis and mineralization occur almost at the same time. The age of diagenesis and mineralization of the deposit is determined to be Late Jurassic, similar to the Huamei''ao, Zhangjiadi and Yanqian in this area. Combined with the previous research data, it is further confirmed that the tungsten polymetallic deposits in the eastern part of Nanling Mountains were mainly formed at 170-150 Ma. The rhenium content of molybdenite in the ore ranges from 6.484×10-6 to 21.346×10-6. Combined with sulfur isotope analysis, it is considered that the ore-forming materials of the deposit originate from crust-mantle mixing. |
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| Keywords: | Cu-W deposit geological characteristics petrogenic and metallogenetic age mineral exploration engineering Jianlong southern Jiangxi Province |
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