中文摘要：

三道湾子金矿床是新近发现的一个典型的碲化物型浅成热液金矿床,金银以碲化物形式赋存于石英脉中。含矿石英脉中石英内流体包裹体的主要类型为液体包裹体,其气相分数大多集中在5%～15%。对应于早矿化阶段、主成矿阶段、晚矿化阶段的流体包裹体的均一温度分别为230～396℃;220～320℃（峰值260～280℃）;140～300℃（峰值180～240℃）。激光拉曼探针原位成分分析表明,各阶段流体包裹体的气、液相成分主要为H2O,部分气相含有甲烷、丙烷、丁炔等烃类;主成矿阶段的纯气体包裹体的成分为甲烷,其次为丙烷、丁炔等,可能是深源流体的启示。δ34S值在0附近,为较小的正值或负值,具有地幔硫的特征。上述分析揭示出,三道湾子金矿床是中低温热液矿床。伴随着早白垩世区域伸展作用期间的亚碱性火山作用,深源流体与大气水混合,促使热液携带的成矿物质在浅部地壳卸载、沉淀和结晶,并以裂隙充填占主导的成矿作用方式多阶段成矿。

英文摘要：

The Sandaowanzi gold deposit is a newly discovered gold telluride deposit,in which gold and silver occur as tellurides in quartz veins.Liquid inclusions in quartz from the gold-bearing quartz vein are the dominant type of fluid inclusions.The gas-liquid ratio is mainly concentrated in the range of 5%～15%.The fluid inclusion homogenization temperatures are grouped into the early mineraliztion stage of 230～396℃,the main mineralization stage of 220～320℃ with the peak temperature at 260～280℃ and the late minealization stage of 140～300℃ with the peak temperature at 180～240℃.Laser Raman spectroscopy shows that the compositions of fluid inclusions are mainly H2O,partly with methane,propane,acetylene and other hydrocarbons.The pure gas inclusions of the main ore-forming stage are characterized by the dominant presence of methane,followed by propane,acetylene and other hydrocarbons,which may suggest mantle-derived fluids.The δ^34S values of sulfur isotopes fall near 0,characteristic of mantle sulfur.The above data show that the Sandaowanzi gold deposit is an epithermal-mesothermal deposit.Ore-forming fluids genetically with mixed meteoritic and mantle sources contributed to gold telluride mineralization during sub-alkaline volcanism in an extensional tectonic setting.Open space filling and crack-sealing constitute the dominant mechanism of multi-stage mineralization.