论文部分内容阅读
天宝山铅锌铜钼多金属矿田由新兴铅-锌矿床、东风铅-锌-铜-钼矿床和立山铜-铅-锌矿床组成,它们分别产在侏罗纪黑云母花岗闪长岩、闪长岩与古生代海相火山-沉积岩的接触带和岩体内部。矿床地质特征研究表明:新兴铅-锌矿床以石英硫化物充填胶结角砾岩筒矿体为特征,具有与中温岩浆热液矿床类似的蚀变特征;东风铅-锌-铜-钼矿床以发育浸染状硫化物、石英硫化物脉和辉钼矿石英脉为特征,具有接触交代热液矿床特征;立山铜-铅-锌矿床则以磁铁矿、方铅矿和闪锌矿等多金属硫化物矿化发育为特征,具有典型的接触交代矽卡岩型矿床特征。对主成矿阶段以及成矿晚阶段的脉石矿物石英流体包裹体研究揭示:新兴铅-锌矿床的石英-黄铁矿阶段、石英-闪锌矿-方铅矿-黄铜矿多金属硫化物阶段和石英-碳酸盐阶段对应的温度分别为270～340℃、190～260℃、130～160℃;盐度(w(NaCl))和密度分别为0.62%～9.86%和0.37～1.00g/cm3;压力为37.31～87.69MPa;激光拉曼光谱分析获得流体包裹体的成分主要为CO2、H2O,含有少量的CH4和N2。东风铅-锌-铜-钼矿床的石英-辉钼矿阶段、石英-闪锌矿-方铅矿-黄铜矿多金属硫化物阶段和石英-碳酸盐阶段对应的温度分别为280～337℃、200～260℃、101～190℃;盐度和密度分别为7.16%～23.95%和0.96～1.12g/cm3;压力为28.23～56.64MPa;激光拉曼光谱分析获得流体包裹体成分为H2O。立山铜-铅-锌矿床的磁铁矿-石英脉阶段、石英-方铅矿-闪锌矿-黄铜矿等多金属硫化物和石英-碳酸盐阶段对应的温度分别为210～240℃、170～200℃、126～160℃,盐度和密度分别为2.07%～9.47%和0.89～0.92g/cm3;压力为33.88～59.72 MPa;激光拉曼光谱分析获得流体包裹体成分为CO2和CH4。基于矿床地质特征、成矿流体性质和来源等方面的讨论,建立了天宝山多金属矿田的成矿模式。
The Tianbaoshan lead-zinc copper-molybdenum polymetallic ore field is composed of the emerging lead-zinc deposit, Dongfeng lead-zinc-copper-molybdenum deposit and Tishan copper-lead-zinc deposit and they are respectively produced in the Jurassic biotite granodiorite , The contact zone between diorite and Paleozoic marine volcano-sedimentary rocks, and the interior of rock mass. The geological characteristics of the deposits show that the emerging lead-zinc deposits are characterized by quartz sulfide-filled cemented breccia ore bodies with similar alteration characteristics to the mesothermal magmatic hydrothermal deposits and the Dongfeng Pb-Zn-Cu-Mo deposits Disseminated sulfide, quartz sulfide veins and molybdenite veins, which are characterized by contact metasomatic hydrothermal deposits. The Tieshan copper-lead-zinc deposit is characterized by multi-metal sulfides such as magnetite, galena and sphalerite Mineralization and mineralization are characterized by typical contact with the account of skarn type deposit characteristics. The study on fluid inclusions of gangue-quartz in the main metallogenic stage and the late stage of ore-forming reveal that quartz-pyrite stage, quartz-sphalerite-galena-chalcopyrite polymetallic sulphide The temperature corresponding to the phase and the quartz-carbonate phase is 270-340 ℃, 190-260 ℃ and 130-160 ℃ respectively. The salinity (w (NaCl)) and density are 0.62% ~ 9.86% and 0.37 ~ 1.00 g / cm3, and the pressure is 37.31 ~ 87.69MPa. The main components of fluid inclusions obtained by laser Raman spectroscopy are CO2 and H2O, with a small amount of CH4 and N2. The corresponding temperatures of quartz-molybdenite stage, quartz-sphalerite-galena-chalcopyrite polymetallic sulphide stage and quartz-carbonate stage of Dongfeng Pb-Zn-Cu-Mo deposit are 280 ~ 337 ℃, 200 ~ 260 ℃ and 101 ~ 190 ℃ respectively; the salinity and density were 7.16% ~ 23.95% and 0.96 ~ 1.12g / cm3, respectively, and the pressure was 28.23 ~ 56.64MPa; Laser Raman spectroscopy analysis showed that the fluid inclusions were H2O . The temperatures corresponding to the polymetallic sulphide and quartz-carbonate phases of the Tianshan copper-lead-zinc deposit such as magnetite-quartz vein, quartz-galena-sphalerite-chalcopyrite are 210-240 ° C , Salinity and density were 2.07% ~ 9.47% and 0.89 ~ 0.92g / cm3 respectively at 170 ~ 200 ℃ and 126 ~ 160 ℃, and the pressure was 33.88 ~ 59.72 MPa. Laser Raman spectroscopy analysis showed that the fluid inclusions were CO2 and CH4. Based on the discussion of the geological characteristics of ore deposits, the nature and source of ore-forming fluid, the metallogenic model of Tianbaoshan polymetallic ore field was established.