现代地质2018，Vol.32Issue(1)：56-65,10.DOI:10.19657/j.geoscience.1000-8527.2018.01.05
西藏浦桑果铜铅锌多金属矿床S、Pb同位素组成及对成矿物质来源的示踪
Sulfur and Lead Isotopic Compositions of the Pusangguo Cu-Pb-Zn Polymetallic Deposit in Tibet: Implications for the Source of Ore-forming Material
摘要
Abstract
The Pusangguo Cu-Pb-Zn polymetallic deposit is located in the southern Gangdese volcanic magma arc,Tibet.The east to west trending skarn orebodies are bedded or lenticular,which mainly occurred in the skarnized marble of Cretaceous Takena Formation.On the basis of previous data and geological investigation,this study systematically analyses the characteristics of sulfur and lead isotopic compositions of sulfides including sphalerite,galena,chalcopyrite,and pyrite to discuss the source of ore-forming materials.The results show that the δ34S values of sulfides range from-2.4‰ to 1.0‰,averaging-0.40‰,with the tower distribution features,indicating that the sources of sulfur have magma-derived sulfur features and is related to the dioritic porphyrite.206Pb/204Pb ratios of sulfides vary from 18.344 to 18.625,averaging 18.555;207Pb/204pb ratios range from 15.549 to 15.794,averaging 15.716;208Pb/204pb ratios are between 38.12 and 39.34,averaging 39.044.The lead isotopic compositions are stable and belong to the normal lead.Combining theμ values with the tectonic evolution diagram of lead isotope,it can be concluded that the lead is primarily sourced from the upper crust with minor involvement of mantle-derived materials.关键词
S同位素/Pb同位素/成矿物质来源/浦桑果/西藏Key words
sulfur isotope/lead isotope/source of ore-forming material/Pusangguo/Tibet分类
天文与地球科学引用本文复制引用
李壮,王立强,李海峰,旦真王修,施硕..西藏浦桑果铜铅锌多金属矿床S、Pb同位素组成及对成矿物质来源的示踪[J].现代地质,2018,32(1):56-65,10.基金项目
国家自然科学基金项目“西藏浦桑果矽卡岩型铜多金属矿床富Co机制研究”(41403040). （41403040）
