| 大兴安岭南段道伦达坝铜钨锡矿床成矿作用:来自锆石和独居石U-Pb和绢云母40Ar-39Ar年龄的约束 |
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| 引用本文： | 陈公正,武广,李铁刚,刘瑞麟,李睿华,李英雷,杨飞.大兴安岭南段道伦达坝铜钨锡矿床成矿作用:来自锆石和独居石U-Pb和绢云母40Ar-39Ar年龄的约束[J].岩石学报,2021,37(3):865-885. |
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| 作者姓名： | 陈公正 武广 李铁刚 刘瑞麟 李睿华 李英雷 杨飞 |
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| 作者单位： | 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;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;北京大学, 造山带与地壳演化教育部重点实验室, 北京 100871 |
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| 基金项目： | 本文受国家重点研发计划项目（2017YFC0601303）、内蒙古自治区地质勘查基金项目（18-1-KY02、2015-01-YS01）和国家自然科学基金项目（41772086）联合资助. |
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| 摘 要： | 道伦达坝中型铜钨锡矿床位于大兴安岭南段,矿体呈脉状赋存于二叠系板岩及华力西期黑云母花岗岩的断裂破碎带中。道伦达坝矿床发育铜矿体、锡矿体、钨矿体、铜钨矿体、铜锡矿体、钨锡矿体和铜钨锡矿体。矿床的成矿过程可以划分为石英-萤石-白云母-电气石-锡石-黑钨矿阶段(Ⅰ阶段)、石英-萤石-黑钨矿-黄铜矿-毒砂-磁黄铁矿阶段(Ⅱ阶段)、石英-萤石-绢云母-黄铜矿-磁黄铁矿-黄铁矿-银矿物阶段(Ⅲ阶段)和方解石-石英-萤石-黄铁矿阶段(Ⅳ阶段)。道伦达坝矿床外围的张家营子岩体中的细粒花岗岩的LA-ICP-MS锆石U-Pb年龄为136.1±0.4Ma。Ⅱ阶段Cu-W共生矿体中2件独居石的LAICP-MS U-Pb年龄分别为136.0±2.3Ma和135.1±2.2Ma。Ⅲ阶段Cu矿体中1件独居石的LA-ICP-MS U-Pb年龄为134.7±2.8Ma。Ⅲ阶段铜矿体中1件绢云母的40Ar-39Ar坪年龄为138.8±0.47Ma,等时线年龄为140.0±1.1Ma。系统的定年结果表明,道伦达坝矿床的铜钨矿体和铜矿体均形成于早白垩世,它们属于同一个成矿系统;成矿与早白垩世高分异花岗岩有密切的成因联系。
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| 关 键 词： | 锆石U-Pb定年 独居石U-Pb定年 绢云母40Ar-39Ar定年 道伦达坝铜钨锡矿床 大兴安岭南段 |
| 收稿时间： | 2020/11/1 0:00:00 |
| 修稿时间： | 2021/2/8 0:00:00 |
Mineralization of the Daolundaba Cu-W-Sn deposit in the southern Great Xing'an Range: Constraints from zircon and monazite U-Pb and sericite 40Ar-39Ar ages |
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| CHEN GongZheng,WU Guang,LI TieGang,LIU RuiLin,LI RuiHu,LI YingLei,YANG Fei.Mineralization of the Daolundaba Cu-W-Sn deposit in the southern Great Xing'an Range: Constraints from zircon and monazite U-Pb and sericite 40Ar-39Ar ages[J].Acta Petrologica Sinica,2021,37(3):865-885. |
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| Authors: | CHEN GongZheng WU Guang LI TieGang LIU RuiLin LI RuiHu LI YingLei YANG Fei |
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| Institution: | MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China |
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| Abstract: | The medium-sized Daolundaba Cu-W-Sn deposit is located in the southern Great Xing’an Range.Orebodies in the deposit,including Cu,Sn,W,Cu-W,Cu-Sn,W-Sn,and Cu-W-Sn orebodies,occur as veins within the fractured zones of the Permian slate and Variscan biotite granite.The ore-forming process of the deposit can be divided into four stages:quartz-fluoritemuscovite-tourmaline-cassiterite-wolframite stage(stageⅠ),quartz-fluorite-wolframite-chalcopyrite-arsenopyrite-pyrrhotite stage(stageⅡ),quartz-fluorite-sericite-chalcopyrite-pyrrhotite-pyrite-silver mineral stage(stageⅢ),and calcite-quartz-fluorite-pyrite stage(stageⅣ).LA-ICP-MS zircon U-Pb age of the fine-grained granite from the Zhangjiayingzi intrusion occurring in the periphery of the deposit is 136.1±0.4 Ma.LA-ICP-MS monazite U-Pb ages for two samples from Cu-W orebodies of the stageⅡand one sample from Cu orebodies of the stageⅢare 136.0±2.3 Ma~135.1±2.2 Ma and 134.7±2.8 Ma,respectively.40Ar-39Ar dating for one sericite sample from Cu orebodies of stageⅢyielded a plateau age of 138.8±0.47 Ma and an isochron age of 140.0±1.1 Ma.The dating results show that the Cu-W and Cu orebodies in the Daolundaba deposit all formed during the Early Cretaceous and belong to the same metallogenic system.The mineralization of the Daolundaba deposit is closely related to Early Cretaceous highly fractionated granite. |
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| Keywords: | Zircon U-Pb age Monazite U-Pb age Serite 40Ar-39Ar age Daolundaba Cu-W-Sn deposit Southern Great Xing''an Range |
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