| 炭质泥岩Re-Os和碎屑锆石U-Pb同位素定年对广东大宝山铜矿床成矿时代的约束 |
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| 引用本文： | 刘武生,赵鸿,赵如意,秦锦华,张熊,蒋金昌,赵晨辉,李挺杰,王成辉.炭质泥岩Re-Os和碎屑锆石U-Pb同位素定年对广东大宝山铜矿床成矿时代的约束[J].岩矿测试,2022(2):300-313. |
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| 作者姓名： | 刘武生 赵鸿 赵如意 秦锦华 张熊 蒋金昌 赵晨辉 李挺杰 王成辉 |
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| 作者单位： | 广东省大宝山矿业有限公司, 广东 韶关 512127;中国地质大学(武汉)地质调查研究院, 湖北 武汉 430074;国家地质实验测试中心, 北京 100037;东华理工大学核资源与环境国家重点实验室, 江西 南昌 300013;自然资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037 |
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| 基金项目： | 中国地质调查局地质调查项目(DD20160346,DD20190379);东华理工大学博士启动基金项目(DHBK2019307);科技成果转化基金项目(CGZH202102);中央级公益性科研院所基本科研业务费项目(JYYWF20183701,JYYWF20183704) |
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| 摘 要： | Re-Os同位素作为一种强有力的技术工具,在黑色页岩沉积时代的精确定年中得到了广泛应用.随着高精度负离子热电离质谱(N-TIMS)测试技术的发展,炭质泥岩Re-Os同位素年龄测试越来越多地被应用于厘定沉积时代.广东省大宝山铜矿成岩成矿时代争议一直是制约成因机制研究的关键因素.本文通过Carius管中逆王水溶解炭质泥岩粉...
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| 关 键 词： | 负离子热电离质谱 LA-ICP-MS 炭质泥岩 Re-Os同位素 碎屑锆石 U-Pb同位素 大宝山铜矿床 成矿时代 |
| 收稿时间： | 2021/9/24 0:00:00 |
| 修稿时间： | 2021/11/22 0:00:00 |
The Constraints of Carbonaceous Mudstone Re-Os and Detrital Zircons U-Pb Isotopic Dating on the Diagenetic and Metallogenic Ages from the Dabaoshan Copper Deposit in Guangdong Province |
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| LIU Wusheng,ZHAO Hong,ZHAO Ruyi,QIN Jinhu,ZHANG Xiong,JIANG Jinchang,ZHAO Chenhui,LI Tingjie,WANG Chenghui.The Constraints of Carbonaceous Mudstone Re-Os and Detrital Zircons U-Pb Isotopic Dating on the Diagenetic and Metallogenic Ages from the Dabaoshan Copper Deposit in Guangdong Province[J].Rock and Mineral Analysis,2022(2):300-313. |
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| Authors: | LIU Wusheng ZHAO Hong ZHAO Ruyi QIN Jinhu ZHANG Xiong JIANG Jinchang ZHAO Chenhui LI Tingjie WANG Chenghui |
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| Institution: | Guangdong Dabaoshan Mining Co., Ltd., Shaoguan 512127, China;Institute of Geological Survey, China University of Geosciences (Wuhan), Wuhan 430074, China;National Research Center for Geoanalysis, Beijing 100037, China;State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 300013, China;Key Laboratory of Mineralization and Resource Evaluation, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | BACKGROUND: With the development of high-precision negative thermal ionization mass spectrometry (N-TIMS) technology, Re-Os isotopic dating of carbonaceous mudstone is more and more widely used in the determination of sedimentary age. The controversy over the diagenetic and metallogenic ages of the Dabaoshan copper deposit in Guangdong Province has always been a key restricting the study of the genetic mechanism.OBJECTIVES: To constrain the diagenetic and metallogenic ages of the Dabaoshan copper deposit.METHODS: Re-Os isotope ratios were determined by high precision N-TIMS after dissolving carbonaceous mudstone powder by reverse aqua regia in the Carius tube. Zircon U-Pb age was determined by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS).RESULTS: (1) The contents of Re and Os ranged from 0.976×10-9 to 2.997×10-9 and 0.067×10-9 to 0.115×10-9, respectively. The 187Re/188Os ratio varied from 78.236 to 154.799, and the 187Os/188Os ratio varied from 1.642 to 1.885. The Re-Os isotopic isochron age of black carbonaceous mudstone was 195±28Ma (n=6, MSWD=17). (2) The 206Pb/238U age ranged from 2631 to 236Ma, including two Mesozoic zircons, accounting for 2.50% of the total zircons, 19 Paleozoic zircons, accounting for 23.8% of the total zircons, 58 proterozoic zircons, accounting for 73% of the total zircons, 1 Archean zircon, accounting for 1% of the total zircons. The results of detrital zircon U-Pb age were broad and developed multiple peak periods, among which the youngest source magmatic zircon was formed in the Indosinian period.CONCLUSIONS: The diagenetic and metallogenic age of the Dabaoshan copper deposit in Guangdong Province was constrained to the early Yanshanian. The distribution characteristics of detrital zircon U-Pb age further indicate that the Lower Jurassic Jinji Formation was formed at the stable continental margin, and its detrital material comes mainly from the ancient continental basement. |
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| Keywords: | negative ion thermal ionization mass spectrometry LA-ICP-MS carbonaceous mudstone Re-Os isotope detrital zircon U-Pb isotope Dabaoshan copper deposit metallogenic age |
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