湘南铜山岭铜多金属矿床成矿物质来源的 S、Pb、C同位素约束
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The Origin of Ore-Forming Material in Tongshanling Cu-polymetallic Ore Field in Hunan Province: Constrains from S-Pb-C isotopes
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    摘要:

    铜山岭铜多金属矿床是湘南W、Sn、Pb、Zn、Cu多金属矿集区的代表性矿床,本文对其不同类型岩石和矿石矿物进行了S、Pb、C同位素组成对比研究。矿石硫化物的δ34S值变化范围为-1.9‰~5.7‰,平均值为2.6‰,硫主要来源于硫同位素组成均一化的岩浆。硫化物硫同位素平衡温度表明,矿床主要成矿温度为134~339℃。矿石铅的206Pb/204Pb、207Pb/204Pb 、208Pb/204Pb比值分别为18.256~18.856、15.726~15.877、38.352~39.430;岩体岩石铅的206Pb/204Pb、207Pb/204Pb 、208Pb/204Pb比值分别为18.617~18.805、 15.721~15.786、 38.923~39.073;两者铅同位素组成相同,都主要为上地壳铅,是由同一岩浆体系分异形成,可能来源于古老基底岩石。不同类型岩石、方解石矿物的δ13CPDB值为-9.88‰~1.32‰,δ18OSMOW值为11.67‰~17.68‰,从矽卡岩矿体到距岩体稍远的围岩地层,方解石矿物的δ13CPDB、δ18OSMOW值逐渐增大,成矿流体中的碳早期可能主要来源于岩浆,在成矿过程中有部分碳酸盐岩地层碳的加入。铜山岭矿床成矿物质主要来源于岩浆,赋矿地层对矿床成矿物质来源作用不显著,仅提供了少量成矿物质。

    Abstract:

    Tongshanling copper-polymetallic ore field is a typical W-Sn-Pb-Zu-Cu polymetallic deposit in south Hunan Province, China. This study has carried on S-Pb-C isotopic anlaysis on various types of rocks and minerals. The δ34S value varies from -1.9‰ to 5.7‰ with the average value of 2.6‰, implying the main source of sulfur comes from the magma with homogeneous S isotopic composition. The equilibrium temperature of S isotopic shows the mineralization temperature is 134~339℃. The 06Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratio values of ore rocks are 18.256~18.856, 15.726~15.877 and 38.352~39.430, respectively; The 06Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratio values of wall rocks are 18.617~18.805, 15.721~15.786 and 38.923~39.073 respectively. The two types of rock with consistent Pb composition of upper crust Pb, indicating that they originate from magma fractionation with an origin of ancient basement rock. The δ13CPDB value of different types of rock and mineral calcite ranges from -9.88‰ to 1.32‰; the δ18OSMOW value ranges from 11.67‰ to 17.68‰. The δ18OSMOW and δ13CPDB value of calcite mineral increase gradually from the skarn rock to further wall rock, so the carbon in ore-forming minerals may generally come from magma, with some carbonate straitgraphic carbon involved later on. The ore-forming material in Tongshanling ore fields mainly comes from magma, while the strata offer limited supply to the mineralization with small amounts of ore-forming material.

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蔡应雄,谭娟娟,杨红梅,卢山松,段瑞春,邱啸飞,程顺波,杨小莉.2015.湘南铜山岭铜多金属矿床成矿物质来源的 S、Pb、C同位素约束[J].地质学报,89(10):1792-1803.
Cai Yingxiong, Tan Juanjuan, Yang Hongmei, Lu Shansong, Duan Ruichun, Qiu Xiaofei, Cheng Shunbo, Yang Xiaoli.2015. The Origin of Ore-Forming Material in Tongshanling Cu-polymetallic Ore Field in Hunan Province: Constrains from S-Pb-C isotopes[J]. Acta Geologica Sinica,89(10):1792-1803.

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  • 收稿日期:2015-07-13
  • 最后修改日期:2015-08-31
  • 录用日期:2015-09-02
  • 在线发布日期: 2015-10-26
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