| 马圣钞.青海虎头崖铜铅锌多金属矿床硫、铅同位素组成及成因意义[J].地质与勘探,2012,48(2):321-331 |
| 青海虎头崖铜铅锌多金属矿床硫、铅同位素组成及成因意义 |
| Sulfur and Lead Isotope Compositions of the Hutouya Copper-Lead-ZincPolymetallic Deposit in Qinghai Province and Their Genetic Significance |
| 投稿时间：2011-11-06 修订日期：2012-01-08 |
| DOI： |
| 中文关键词: 硫、铅同位素 矿床成因 虎头崖 祁漫塔格 东昆仑 |
| 英文关键词: S and Pb isotopes ,deposit genesis, Hutouya, Qimantage, East Kunlun |
| 基金项目:本文受国土资源部“百人计划冶项目(200809)、中国地质调查局地质调查项目(1212011085528,1212011120135)和国家自然科
学基金项目(41172076)资助 |
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| 中文摘要: |
| [摘 要] 青海虎头崖铜铅锌多金属矿是东昆仑祁漫塔格成矿带内多金属矿床的典型代表之一。本文对该矿床硫、铅同位素组成进行详细研究,探讨了成矿物质来源和矿床成因。结果表明,该矿床黄铜矿、方铅矿、闪锌矿、黄铁矿等硫化物的δ34S 值变化于+0.6‰～+8.3‰,平均+4.4‰,反映成矿流体中的硫为海水硫酸盐的地层硫和深源岩浆硫的混合硫,而不同矿带硫同位素均值的差别,可能与围岩地层硫的差异及参与程度有关。矿石矿物铅同位素组成总体变化较小(206Pb/204Pb、207Pb/204Pb 和208Pb/204Pb比值分别为18.476～18.688、15.560～15.688 和38.261～38.599),主要分布于造山带和上地壳铅演化线范围内,为岩浆作用导致的上地壳和地幔混合成因。由于赋矿层位及主控矿因素不同,各矿带的矿石铅同位素出现一定的差异。比如滩间山群内6号铜多金属矿点207Pb/204Pb 值和产于岩体与缔敖苏组接触带上的域矿带207Pb/204Pb 值相比,后者的上地壳铅参与程度较高,进一步证明壳幔混合作用对本矿区的影响。该矿床为与岩浆侵入活动密切相关的矽卡岩型铜铅锌多金属矿床。 |
| 英文摘要: |
| Abstract:The Hutouya Pb-Zn polymetallic ore district in Qinghai Province is a typical one in the Qimantage metallogenic belt of East Kunlun in Qinghai Province. This paper studies the characteristics of sulfur and lead isotopes from the Hutouya ore district, and analyses the source of ore-forming
materials. Theδ34 S values of sulfide minerals such as chalcopyrite, galena, sphalerite, and pyrite sulfides range from +0.6‰to + 8.3‰, with an average value of 4.4‰. The narrower distribution range and the lower average of theδ34S value indicate the source of sulphur is mix of crust sulfate with deep-source magma sulphur. Theδ34S peak values are different, which may be associated with the difference in host-rock sulphur. The main δ34S values ranging from +2.2‰to +7.4‰ and the narrow distribution range imply the homogenization happened in high-temperature deep sources or when the sulphur was transported up to the upper crust. The variation range of lead isotopic ratios is also smaller. The206Pb/204Pb,207Pb/204Pb and208Pb/204Pb ratios of sulfide ores are 18.476～18.688, 15.56～15.688 and 38.261～38.599, respectively. This may indicate that the lead isotope of sulfides is from the same deep magma source area. Lead isotope ratios of the mining area is mainly distributed within the scope defined by the evolution lines of the orogenic belt and upper crust, implying that the lead isotope originated from mixture of upper crust and mantle. As the result of the different wall rock and dominant ore-control factors, lead isotopes from different ore belts of sulfides exhibit certain differences. For example, compared with the207Pb/204Pb ratio of the Chulutaohai copper polymetallic mine nearby the VI ore belt within the Tanjianshan group with the II ore belt in the contact zone between the rock mass and the Diaosu group, the lead isotope of the later one may contain more lead from the upper crust, which further proves the influence of crusl-mantle mixing on the Hutouya ore district. |
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