| 大兴安岭中段闹牛山铜金矿床的硫铅同位素地球化学特征与成矿物质来源 |
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| 引用本文： | 贺海根,杨永强,武利文,钱梦轩,牛吉芳,李浩,刘怀金,孙引强.大兴安岭中段闹牛山铜金矿床的硫铅同位素地球化学特征与成矿物质来源[J].地质找矿论丛,2017,32(1):24-32. |
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| 作者姓名： | 贺海根 杨永强 武利文 钱梦轩 牛吉芳 李浩 刘怀金 孙引强 |
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| 作者单位： | 1. 中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083;中国地质大学(北京)地球科学与资源学院,北京100083;2. 内蒙古自治区地质调查院,呼和浩特,010020;3. 内蒙古自治区有色地质勘查局,呼和浩特,010010;4. 核工业二四三大队,内蒙古赤峰,024000 |
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| 基金项目： | 大兴安岭南麓整装勘查区关键基础地质研究，国家自然科学基金项目，覆盖区成矿成晕机理与找矿技术 |
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| 摘 要： | 通过对闹牛山铜金矿床硫、铅同位素的系统研究,探讨了其成矿物质的来源。同位素测试结果表明,δ(~(34)S)=2.0×10~(-3)~3.5×10~(-3),均为正值,呈塔式分布,峰值出现在2.0×10~(-3)~2.5×10~(-3),具幔源硫和陨石硫的特征;矿石铅~(206)Pb/~(204)Pb=18.169~18.510,~(207)Pb/~(204)Pb=15.484~15.646,~(208)Pb/~(204)Pb=37.877~38.431,铅同位素组成较为均一,具正常铅的组成特点;且μ值和ω值偏低,表明矿石铅源区富钍亏铀。在Zartman铅同位素构造模式图解中,投点主要落于地幔与造山带之间和造山带演化线附近;在Δβ—Δγ成因分类图解上,12件测试样品落入上地壳与地幔混合的俯冲带岩浆作用成因铅同位素源区,4件样品落入地幔源铅的范围内,但与两源区界限临近。由此认为,闹牛山铜金矿床的成矿物质主要来源于地幔,并有上地壳物质的混染,这种认识对研究大兴安岭中南段铜多金属矿带的成矿规律具有指导意义。
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| 关 键 词： | 闹牛山铜金矿床 硫同位素 铅同位素 成矿物质来源 地球化学 大兴安岭 内蒙古 |
| 收稿时间： | 2015/11/9 0:00:00 |
S, Pb isotope geochemistry and ore material source of Naoniushan Cu-Au deposit in middle part of the Da Hinggan Mountains |
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| HE Haigen,YANG Yongqiang,WU Liwen,QIAN Mengxuan,NIU Jifang,LI Hao,LIU Huijin and SUN Yingqiang.S, Pb isotope geochemistry and ore material source of Naoniushan Cu-Au deposit in middle part of the Da Hinggan Mountains[J].Contributions to Geology and Mineral Resources Research,2017,32(1):24-32. |
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| Authors: | HE Haigen YANG Yongqiang WU Liwen QIAN Mengxuan NIU Jifang LI Hao LIU Huijin and SUN Yingqiang |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resource, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,State Key Laboratory of Geological Processes and Mineral Resource, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,Institute of Geological Survey of Inner Mongolia, Hohhot 010020, China,State Key Laboratory of Geological Processes and Mineral Resource, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,State Key Laboratory of Geological Processes and Mineral Resource, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,State Key Laboratory of Geological Processes and Mineral Resource, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,Nonferrous Metals Geological Bureau of Inner Mongolia, Hohhot 010010, China and Geologic Party No. 243, CNNC, Inner Mongolia, Chifeng 024000, China |
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| Abstract: | S,Pb isotope of Naoniushan Cu-Au deposit is systematically studied to explore its ore material source.The ~4S values are positive,2.0× 10-3 ～3.5 × 10-3 distributed in tower shape with peak values of 2.0 × 10-3 ～2.5 × 10-3 that is characteristic of the mantle-derived sulfur and meteorite sulfur.Value of 206pb/204pb varies in the range of 18.169～18.510;207pb/204pb 15.484～15.646;208Pb/204pb 37.877～ 38.431 show more homogeneous Pb isotopic composition that is characteristic of normal Pb andμ,ω values are lower reflecting that the source area of the ore is rich in Th and depleted in U.In the Pb isotope tectonic discriminant diagram of Zartman main points of the values fall between the mantle and orogenic belt and near the evolution line of the orogenic belt;in Δβ-Δγ genetic classification diagram,values of 12 samples fall in the Pb isotope source area of subduction zone where upper crust and mantle material-mixed magma occur.;values of 4 samples in Pb source area of mantle but the fall points adjacent to the boundary of the subduction and the mantle source area.Therefore,it is believed that the main source of the deposit is the mantle and incorporated with the crustal material contamination.This is significance of guiding the study of metallogenic regularity of copper-polymetallic ore deposits in middle-south part of the Da Hinggan Mountains ore belt. |
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| Keywords: | Naoniushan Cu-Au deposit S isotope Pb isotopes ore material source geochemistry Da Hinggan Mountains Inner Mongolia |
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