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湖南省留书塘铅锌矿床S、Pb同位素特征及意义

程顺波, 吴志华, 刘重芃, 刘阿睢, 马丽艳, 卢友月

程顺波, 吴志华, 刘重芃, 刘阿睢, 马丽艳, 卢友月. 2017: 湖南省留书塘铅锌矿床S、Pb同位素特征及意义. 地质通报, 36(5): 846-856.
引用本文: 程顺波, 吴志华, 刘重芃, 刘阿睢, 马丽艳, 卢友月. 2017: 湖南省留书塘铅锌矿床S、Pb同位素特征及意义. 地质通报, 36(5): 846-856.
CHENG Shunbo, WU Zhihua, LIU Zhongpeng, LIU Asui, MA Liyan, LU Youyue. 2017: Sulfur and lead isotope geochemistry of the Liushutang lead-zinc deposit in Hu'nan Province and its significance. Geological Bulletin of China, 36(5): 846-856.
Citation: CHENG Shunbo, WU Zhihua, LIU Zhongpeng, LIU Asui, MA Liyan, LU Youyue. 2017: Sulfur and lead isotope geochemistry of the Liushutang lead-zinc deposit in Hu'nan Province and its significance. Geological Bulletin of China, 36(5): 846-856.

湖南省留书塘铅锌矿床S、Pb同位素特征及意义

基金项目: 

中国地质调查局项目《南岭成矿带中西段地质矿产调查》 121201009000150002

《右江成矿区桂西地质矿产调查》 121201009000150012

详细信息
    作者简介:

    程顺波(1983-), 男, 硕士, 助理研究员, 从事花岗岩地球化学、矿床学研究。E-mail:chsb2007@qq.com

    通讯作者:

    刘阿睢(1984-), 男, 工程师, 从事地质矿产调查评价工作。E-mial:183498641@qq.com

  • 中图分类号: P597+.2;P618.4

Sulfur and lead isotope geochemistry of the Liushutang lead-zinc deposit in Hu'nan Province and its significance

  • 摘要:

    对湖南省留书塘铅锌矿床不同阶段矿石硫化物进行的S、Pb同位素研究表明,17件矿石样品硫化物的S同位素组成变化范围较宽(δ34S=-12.8‰~4.6‰),具有地层有机硫(约-13‰)与岩浆硫(约5‰)混合特征。从早阶段到晚阶段,硫化物呈现出δ34S值逐渐升高、极差逐渐增大的演化趋势。最晚形成的重晶石矿石硫由地层硫酸盐提供。13件硫化物样品的Pb同位素组成比较稳定,206Pb/204Pb、207Pb/204Pb、208Pb/204Pb值变化范围分别为18.627~18.942、15.670~15.804和38.366~38.912,平均值分别为18.747、15.705和38.614。与区内新元古界—寒武系基底、邻区湘南与铅锌矿相关的岩浆岩钾长石Pb同位素进行的对比表明,矿石铅主要来源于矿区深部岩浆岩,少部分可能来自于基底寒武纪地层。结合宏观地质特征分析,留书塘矿床可能是与岩浆岩有关的热液充填交代矿床,其成矿物质具有多来源特征。

    Abstract:

    The discovery of the Liushutang lead-zinc deposit is one of the major breakthroughs of prospecting in the Nanling metal-logenic belt in recent years.The lead-zinc lodes are strictly controlled by the shattered fracture zones along the western margin of Hengyang basin.Field observation shows that the related mineralization can be divided into three stages of quartz-pyrite, quartzsphalerite-galena and barite.In this paper, systematic research on S, Pb isotopes based on different stages of ores were conducted to explain the origin of ore-forming materials and ore genesis.The result shows that sulfur isotopes of 17 sulfide samples vary in a wide range (δ34S value being-12.8‰~4.6‰) with a dynamic evolution of gradual increasing of δ34S values from early to late.This can be probably explained by a mixing process of organic sulfur (~-13‰) and magmatic sulfur (~5‰).Sulfur of latest barite ore (δ34S is 14.7‰~24.4‰) might have been provided by the strata sulfate.206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb ratios of 13 sulfide ore samples vary in the range of 18.627~18.942, 15.670~15.804 and 38.366~38.912, with the average value being 18.747, 15.705 and 38.614, respec-tively.These values are very similar to values of Pb isotopes of magmatic feldspar in southern Hu'nan and also have weak linear rela-tion with Pb isotopes of regional Cambrian strata, suggesting that ore materials might have mainly originated from magmatic pluton in the depth, and subordinately from the Cambrian strata.Based on the above results and geological evidence, the authors put forward a model of magma-related hydrothermal mineralization with multiple sources of ore-forming materials, which may be suitable for explaining the ore genesis of the Liushutang deposit.

  • 致谢: 中国地质调查局武汉地质调查中心李华芹研究员、中国地质大学(武汉)凌文黎教授对本文修改提出了许多宝贵意见,武汉地质调查中心蔡应雄工程师在成文过程中提供了较多帮助,在此表示诚挚的感谢。
  • 图  1   衡阳盆地及周边地区地质矿产简图(据参考文献[19]修改)

    1—不整合地质界线;2—整合地质界线;3—断裂;4—基底断裂或深大断裂;5—花岗质侵入体;6—铅锌矿;7—铜矿;8—铜铅锌矿。Pt3—新元古界;Z-S—震旦系-志留系;D-T2—泥盆系-中三叠统;K-N—白垩系-新近系。a—株洲-双牌深大断裂带;b—邵阳-郴州基底断裂带;c—醴陵-宁远深大断裂;d—常德-安仁基底断裂带

    Figure  1.   Geological map of Hengyang basin and adjacent areas showing distribution of mineral resources

    图  2   湖南省留书塘铅锌矿床矿区地质略图(据参考文献修改)

    1—整合/不整合地质界线;2—断裂破碎带及编号;3—重晶石矿体;4—勘探线及见矿铅锌钻孔;5—见矿重晶石/未见矿钻孔。Q—第四系;K1s—白垩系神皇山组;C1m—石炭系孟公坳组;D3x—泥盆系锡矿山组;D2q—棋梓桥组;D2t—跳马涧组

    Figure  2.   Simplified geological map of the Liushutang lead-zinc deposit

    图  3   留书塘铅锌矿15线剖面简图(据参考文献修改,地层代号注释同图 2

    1—碳酸盐岩;2—碎屑岩;3—断裂破碎带;4—铅锌矿体;5—重晶石矿体;6—钻孔编号及深度。

    Figure  3.   Simplified geological section along No.15 exploration line of the Liushutang lead-zinc deposit

    图  4   留书塘矿床不同成矿阶段矿石的穿插关系

    a—石英+闪锌矿+方铅矿阶段矿石(2)中包含石英+黄铁矿阶段角砾(1)和蚀变围岩角砾(4);b—重晶石阶段细脉(3)穿切灰色石英+黄铁矿阶段贫矿石(1);c—石英+闪锌矿+方铅矿阶段早期矿石条带(2-1)被稍晚的石英(±铅锌矿物)条带(2-2)穿插,两者界线呈波浪状;d—重晶石阶段大脉(3)穿切块状铅锌矿石(2)

    Figure  4.   Penetrating relationship of ores of different stages in the Liushutang deposit

    图  5   留书塘矿床硫化物δ34S值直方图(a)及其与成矿阶段关系(b)

    Cp—黄铜矿;Py—黄铁矿;Sp—闪锌矿;Ga—方铅矿;Br—重晶石

    Figure  5.   δ34S histogram(a)and δ34S evolution diagram of sulfide samples (b)from the Liushutang deposit

    图  6   留书塘矿床矿石矿物206Pb/204Pb-207Pb/204Pb(a)和206Pb/204Pb-208Pb/204Pb(b)图解(底图据参考文献[25])

    A—地幔铅演化曲线;B—造山带铅演化曲线;C—上地壳铅演化曲线;D—下地壳铅演化曲线。1—矿石铅;2—奥陶系;3—寒武系;4—新元古界基底[23-24];5—湘南地区与铅锌矿相关的花岗岩钾长石[22]

    Figure  6.   206Pb/204Pb-207Pb/204Pb (a) and 206Pb/204Pb-208Pb/204Pb (b) diagrams for sulfides from the Liushutang deposit

    表  1   留书塘铅锌矿床主要原生矿物生成顺序

    Table  1   The mineral paragenesis in the Liushutang Pb-Zn deposit

    成岩成矿期成矿阶段 热液期
    石英-黄铁矿阶段 石英-闪锌矿-方铅矿阶段 重晶石阶段
    石英
    黄铁矿
    黄铜矿
    矿物名称磁黄铁矿
    闪锌矿
    方铅矿
    斑铜矿
    辉银矿
    重晶石
    方解石
    注:线条粗、细分别代表形成矿物的多、少;线条的长、短代表延续时间的长、短
    下载: 导出CSV

    表  2   留书塘矿床代表性矿石矿物S同位素组成

    Table  2   S isotopic compositions of typical sulfides from the Liushutang deposit

    样品号采样位置成矿阶段测试矿物δ34SCDT/%
    12D128-1四中段2-2闪锌矿-7.5
    12D128-2四中段2-1闪锌矿-8.1
    四中段黄铁矿-10.8
    12D128-3四中段2-2闪锌矿-4.5
    12D128-4四中段2-1闪锌矿-5.0
    12D128-5四中段2-1闪锌矿-10.0
    12D129-1五中段3重晶石19.4
    12D129-4五中段2-2闪锌矿4.6
    12D130-2六中段1黄铁矿-12.8
    12D130-3六中段1黄铁矿-12.0
    12D130-4六中段2-1闪锌矿-3.8
    12D130-5六中段3重晶石14.7
    12D131-1十三中段2-1方铅矿-7.6
    12D131-2十三中段2-1闪锌矿-5.4
    12D131-3十三中段2-2闪锌矿4.1
    方铅矿-2.5
    12D131-4十三中段2-1闪锌矿-7.1
    方铅矿-10.2
    12D131-5十三中段1黄铜矿-9.3
    12D131-6十三中段1黄铁矿-10.7
    12D131-7十三中段1黄铜矿-9.9
    12D131-8十三中段3重晶石24.4
    注:1代表石英-黄铁矿阶段;2-1代表石英-闪锌矿-方铅矿阶段稍早形成的细粒铅锌矿石;2-2代表同阶段稍晚形成的粗粒矿石;3代表重晶石阶段
    下载: 导出CSV

    表  3   留书塘矿床代表性矿石矿物Pb同位素组成

    Table  3   Pb isotopic compositions of typical sulfides from the Liushutang deposit

    样品号 成矿阶段/地层/岩体 测试矿物/岩性 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb 资料来源
    12D128-2 2-1 闪锌矿 18.627 0.003 15.685 0.003 38.655 0.007
    12D128-32-2闪锌矿18.7190.00215.6770.00238.5190.004
    12D128-52-1闪锌矿18.7270.00215.7200.00138.7060.004
    12D129-13重晶石18.6290.00215.6810.00238.6300.005
    12D129-42-2闪锌矿18.8250.00215.6700.00138.4140.004
    12D130-21黄铁矿18.7090.00215.7030.00138.6500.004
    12D130-31黄铁矿18.6280.00215.6820.00138.6460.004本文
    12D130-53重晶石18.7430.02215.7430.01638.7470.046
    12D131-32-2方铅矿18.7050.00215.6930.00238.5640.005
    12D131-42-1方铅矿18.8930.00115.6800.00238.3660.002
    12D131-51黄铜矿18.9420.00215.7110.00238.4840.006
    12D131-61黄铁矿18.8580.00215.8040.00238.9120.005
    12D131-83重晶石18.7080.00215.7160.00238.6830.005
    14D04 奥陶系 板岩 19.031 0.004 15.708 0.004 40.639 0.008 本文
    14D05粉砂岩18.9110.00215.7810.00239.6700.006
    14D08 粉砂岩 18.898 0.003 15.659 0.003 38.478 0.007
    14D09寒武系板岩21.1060.00315.8950.00238.9590.005本文
    14D10粉砂岩19.3470.00415.6970.00438.7780.010
    14D11 粉砂质板岩 18.651 0.003 15.695 0.001 39.487 0.005
    14D12板岩18.7210.00315.6950.00339.6090.006
    14D13奥陶系板岩19.1560.00315.7240.00240.0260.005本文
    14D15板岩18.8110.00315.7020.00239.3920.005
    14D16板岩18.9070.00415.6900.00340.0590.008
    309-12 钾长石 18.519 15.589 38.454
    273-53 黄沙坪钾长石18.62215.60038.572 [17]
    273-23钾长石18.65715.67538.438
    273-19钾长石19.30515.90538.807
    D137-1 铜山岭 钾长石 18.704 15.721 38.943 [17]
    D139-1钾长石18.80515.72638.987
    水83-7 水口山 钾长石 18.400 15.630 38.484 [17]
    水83-12 钾长石 18.534 15.682 38.583
    注:成矿阶段1、2-1、2-2、3含义同表 2
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-04-02
  • 修回日期:  2016-08-11
  • 网络出版日期:  2023-08-15
  • 刊出日期:  2017-04-30

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