中文摘要：

茂租铅锌矿床地处扬子地块西缘，是川滇黔铅锌成矿域内赋存于震旦系灯影组白云岩中大型铅锌矿床的典型代表。其工业矿体呈似层状、脉状和不规则状。热液方解石和矿石硫化物（闪锌矿、方铅矿和黄铁矿）是主要矿物，其形成贯穿整个成矿过程。在矿床地质特征解析基础上，获得了热液方解石C-O同位素和矿石硫化物S-Pb同位素数据，结果表明热液方解石δ^13CPDB值和δ^18OSMOW值变化范围较窄，分别为-3．73％0～-1．95‰和＋13．80‰～＋14．95‰，在δ^13CPDBB与δ^18OSMOW图上介于海相碳酸盐岩和原生碳酸岩范围间，呈弱负相关趋势，表明成矿流体中的coz主要由海相碳酸盐岩溶解作用形成，并存在慢源和有机CO2加入；硫化物δ^34 OSCDT值介于＋13．35‰～＋15．37‰，暗示成矿流体中的硫是海相硫酸盐岩热化学还原的产物，而舍硫有机质热降解也有贡献；硫化物Pb同位素组成稳定，^205Pb／^204Pb，^207Pb／^204Pb和^204Pb／^204Pb值范围，分别为18．129～18．375，15．644-15．686和38．220-38．577，位于上地壳和造山带Pb演化线之间，落入基底岩石（昆阳群和会理群）Pb同位素组成范围内，表明成矿物质具有壳源特征，主要由基底岩石提供。综合各类地质一地球化学信息，认为茂租铅锌矿床成矿流体中不同组分来源不同，具有“多来源混合”特征，其成矿机制可以用“流体混合”模式来解释。

英文摘要：

The Maozu Pb-Zn deposit,a typical large Pb-Zn deposit in Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province, is located on the western margin of Yangtze Block and hosted in the dolomite of Dengying Formation of Upper Sinian. The industrial ore-bodies are stratiform-like, vein and irregular shaped. Hydrothermal calcite and sulfide （sphalerite,galena and pyrite） are the main gangue and ore minerals,which were formed throughout the ore-forming process. C-O iso- topic compositions of hydrothermal calcites, S-Pb isotopic compositions of sulfides were analyzed in this paper. It was showed that δ^13CPDB and δ^18OsMoW values of hydrothermal calcites varied in a narrow range of -3.73‰ to -1.95‰ and ＋13.80‰ to ＋ 14.95‰, respectively. All the samples are plotted into the field between the marine carbonate and mantle in the diagram of δ^13CPDB vs δ^18 OSMOW,and show a weak negative correlation,implicating that the CO2 in the ore-forming fluids were mainly produced by dissolution of marine carbonate,and contributed by organic and mantle CO2, δ^34 SCDT values of sulfides separates range from ＋ 13.35‰ to ＋ 15.37‰. It shows that the reduced sulfur in the ore-forming fluids is the production of thermo-chemical sulfate reduction, and added by thermal degradation of sulfur-bearing organic matter. 206^pb/204^Pb, 207^pb/204^Pb and 208^Pb/204^Pb ratios of sulfide separates have a narrow range of 18. 129 to 18. 375,15. 644 to 15. 686 38. 220 to 38. 577,respectively,which lies in the region between Upper Crust and orogenic Pb area,and plots into the field of basement rocks （Kunyang and Huili Groups）,indicating that the crust source features of ore-forming metals mainly supplied by basement rocks. All the geological and geochemical information show that the source of ore-forming metals and fluids of the Maozu Pb-Zn deposit is mixed product and the mechanism of mineralization could be explained by ＂fluids mixing＂ model.