中文摘要：

镰子沟金矿床是小秦岭驾鹿金矿田内的一个重要金矿床,赋存于太古宇太华群秦仓沟组深变质片麻岩系中,矿石主要为石英脉型。通过显微镜下观察和电子探针分析,确认矿石中存在碲金矿、斜方碲金矿、碲金银矿、碲银矿、碲铅矿、碲镍矿、自然碲等大量含碲矿物。在石英、黄铁矿裂隙中,也存在大量自然金颗粒,它们与硫化物、碲化物共生。结合不同成矿阶段的成矿温压条件和矿物组合研究,构建了该矿床的热力学相平衡关系图,限定了碲化物与其他矿物稳定存在的物理化学条件：即在成矿Ⅱ阶段,f（O2）约为10^-34.00～10^-31.00,f（H2S）约为10^-1.42～10^-0.9,pH值约为6.0～6.8（300℃）。在成矿Ⅲ阶段,f（S2）的范围约在10^-16.56～10^-12.30之间,而f（Te_2）的范围约在10^-13.70～10^-9.44（200℃）。碲化物一般晚于硫化物形成,并且高的f（Te_2）值和f（Te_2）/f（S_2）比值是控制碲化物形成的关键因素。

英文摘要：

The Lianzigou gold deposit is an important gold deposit in the Jialu gold orefield within the Xiaoqinling re- gion. The deposit is hosted in the highly metamorphic gneiss which is the main rock type of the Qincanggou Formation of the Archean Taihua Group. Ores mainly occur as quartz-vein type. Detailed petrographic and elec- tron microprobe analysis of ore minerals was carried out. Numerous tellurium minerals were identified, such as calaverite, krennerite, petzite, hessite, altaite, melonite and native tellurium. In addition, large amounts of na- tive gold were recognized in the fractures in quartz and pyrite, coexisting with sulfides and tellurides. Physico-chemical phase diagrams were established according to mineral assemblages, temperature and pressure conditions of different metallogenic stages in this study. Physicochemical conditions for the formation of tellurides and other minerals are as follows： f（O2） = 10^- 34.00～ 10^- 31.00 f（H2S） = 10 ^- 1.42 ～ 10^-0.9 and pH = 6-- 6.8 for stage Ⅱ （3001C）, and f（S2） = 10^-16.56～10^-12.30 and f（Te2） = 10^-13.70-10^-9.44 for stage Ⅲ （200℃）. Mineralogical investigation in this study indicates that tellurides formed later than sulfides, and high f（Te2 ） values and f（Te2）/f（S2） ratios were the two key factors that controlled the precipitation of tellurides.