中文摘要：

东桐峪金矿床位于小秦岭金矿田的中西部,其含金石英脉受韧性剪切构造带的控制。该矿床的构造-成矿过程可划分为4个阶段：Ⅰ黄铁矿-乳白色石英脉阶段;Ⅱ灰白色石英-黄铁矿阶段;Ⅲ石英-多金属硫化物阶段;Ⅳ石英-碳酸盐阶段。相对于小秦岭地区的其他金矿床,东桐峪金矿床的流体包裹体研究资料相对缺乏。文章表明,该矿床内的流体包裹体类型主要为CO2-H2O包裹体和水溶液包裹体,见少量纯液相CO2包裹体。显微测温表明,Ⅰ阶段的构造-成矿流体以中温、富CO2等挥发分为特征,包裹体均一温度为221~392℃,盐度w（NaCleq）为5.5%~7.9%,密度为0.84~0.93 g/cm3;Ⅱ阶段和Ⅲ阶段以CO2-H2O±CH4流体为主,包裹体均一温度为205~350℃（Ⅱ阶段）和224~271℃（Ⅲ阶段）,盐度w（NaCleq）集中于5.1%~7.1%,密度为0.83~0.96 g/cm3;Ⅳ阶段的流体演化为中-低温、低盐度的盐水溶液体系,包裹体均一温度为175~185℃。文章对该矿床各成矿阶段的压力进行了估算,Ⅰ、Ⅱ、Ⅲ阶段的流体最小捕获压力分别为123~160 MPa、160~170 MPa、170 MPa左右。

英文摘要：

The Dongtongyu gold deposit is located in the middle-west part of the Xiaoqinling gold orefield.Gold-bearing quartz veins are controlled by the ductile shear zone.According to the vein types and their crosscutting relationships,mineralization of the Dongtongyu gold deposit can be divided into four stages： Ⅰ pyrite-white quartz vein stage;Ⅱ gray quartz-pyrite stage;Ⅲ quartz-polymetallic sulfides stage;Ⅳ quartz-carbonate stage.The main types of fluid inclusions in vein quartz are CO2-H2O fluid inclusions and aqueous fluid inclusions,with small amounts of pure CO2 fluid inclusions.The fluid inclusions of stage Ⅰ are characterized by mesothermal CO2-rich fluids,with homogenization temperatures of fluid inclusions being 221~392℃,salinities w（NaCleq） 5.5%~7.9%,and densities 0.84~0.93 g/cm3.The fluid inclusions at stage Ⅱ and stage Ⅲ are characterized by CO2-H2O±CH4 fluids,with homogenization temperatures being 205~350℃（stage Ⅱ） and 224~271℃（stage Ⅲ）,salinities w（NaCleq） 5.1%~7.1%,and densities 0.83~0.96 g/cm3.The fluids at the quartz-pyrite-carbonate stage are epithermal-mesothermal low salinity aqueous solutions,with homogenization temperatures being 175~185℃.In this paper,the minimum trapping pressure of fluid inclusions are estimated to be 123~160 MPa,160~170 MPa and 170 MPa for stage Ⅰ,Ⅱand Ⅲ.The main gold mineralization was related to the post-orogenic extension environment,with the evolution characteristics corresponding to the evolution of shear zones.