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应用LA-ICP-MS分析方法进行大井矿床中心部位的锡铜矿体及黄岗梁矿床锡矿体萤石及石英中单个包裹体流体组分分析,以包裹体流体中微量元素Rb/Sr,Sn/Cu等比值追踪大井矿床富铜及富锡流体的来源与演化.研究结果表明大井矿床富铜流体Cu>Sn,Sr>Rb几至几十倍,相对富集Na,主要产出于萤石中,流体可能来源于深源较基性岩浆.富锡流体Sn>Cu,Rb>Sr几至几十倍,相对富集K,产出于石英及萤石中,流体可能来源于浅源的花岗岩浆.富锡与富铜两种流体在中低温-低盐度阶段强烈叠加富集成矿,形成大井矿床中心部位锡铜富矿体,解决了前人研究中难于解决的富锡、富铜流体成矿机理问题.
The fluid compositions of single inclusions in fluorite and quartz from the tin-copper orebody in the central part of the Dōjing deposit and the Huanggangliang deposit were analyzed by LA-ICP-MS. The fluid inclusions of trace elements Rb / Sr, Sn / Cu and other sources to track the source and evolution of copper-rich and tin-rich fluids in the Dajing ore deposit.The results show that copper-rich fluid Cu> Sn, Sr> Rb in Dajing ore deposit is several to tens of times more concentrated than Na and mainly produced in fluorite , The fluids may originate from the deeper mantle than the basic magma.The Sn-rich fluids Sn> Cu, Rb> Sr several to tens of times, relatively enriched in K, produced in quartz and fluorite, the fluid may be derived from shallow Granite magma, rich tin and copper rich fluid in the low temperature - low salinity stage strong superimposed enrichment of mineralization, the formation of central ore-rich copper-rich ore body, to solve the previous study difficult to solve the rich tin, rich in copper Fluid formation mechanism.