中文摘要：

赛都金矿床位于新疆额尔齐斯构造带北西段，矿体受韧性剪切构造带的控制，赋存于玛尔卡库里巨型剪切带内的蚀变糜棱岩带内。构造一成矿流体早期以中高温、富CO2-N2等挥发分为特征，包裹体均一温度252．0—408．0℃；中期以CO2-H2O流体为主，包裹体均一温度203．0～325．8℃，反映了中温热液特征；中晚期演化为中低温、中低盐度的盐水溶液体系，包裹体均一温度120．0～221．0℃。矿石中黄铁矿的δ^34S变化范围在3．53‰-5．88‰之间；铅同位素组成的^206Ph／^204Ph变化于18．0997-18．3585，^207Pb／^204Pb变化于15．4877-15．5790，^208Pb／^204Pb变化于38．1116～38．3551。硫铅同位素研究表明成矿物质是从深部富集的，在造山作用过程中从深部岩石通过热液萃取获得。主要的金矿化与后碰撞造山的伸展构造环境有关，构造一成矿流体的演化特征与剪切带演化过程相吻合。

英文摘要：

The Saidu gold deposit is located in the northwest part of Ertix tectonic zone in Xinjiang. The ore bodies occur in altered mylonite zones within the Markuli giant fault belt and are controlled by the ductile shear zone. The tectonic-metallogenic fluids of the early stage are characterized by mesothennal-hypothermal CO2-N2-rich fluids, with homogenization temperatures of fluid inclusions being 252.0 - 408.0℃. The tectonic-metallogenic fluids at the middle stage are characterized by CO2-H2O fluids, with homogenization temperatures being 203.0 -325.8℃. The fluids at the late stage were epithermal-mesothermal low salinity aqueous solutions, with homogenization temperatures being 120.0 -221.0℃. The 834S values of pyrite in the gold deposit range from 3.53‰ to 5.88‰; the lead isotopic compositions are fairly constant, with ^206pb/^204pb ranging from 18. 099 7 to 18. 358 5, ^207pb/^204pb ranging from 15. 487 7 to 15. 579 0, and ^208pb/^204pb ranging from 38.111 6 to 38. 355 1. Sulfur and lead isotope studies indicate that the ore-forming materials originated from the deep portion, and had close relationship with magmatic activity. The ore materials were obtained from rocks of the lower crust during the orogenic period. The main gold mineralization was related to the post-orogenic extension environment, with the evolution characteristics corresponding to the evolution of shear zones.