大兴安岭北段三道湾子碲化物型金矿床的发现及意义

Discovery and geological significance of Sandaowanzi telluride type gold deposit in the northern Daxing′anling, Heilongjiang, China

摘要: 大兴安岭北段三道湾子金矿床属于中—低温热液型金矿床，含金石英脉产于上侏罗统塔木兰沟组粗面安山岩和粗面安山质角砾岩中。通过光学显微镜、扫描电子显微镜观察和能谱分析，在矿脉中发现大量金、银碲化物。该矿物组合中Au、Ag、Te的含量统计分别为：Au 30.20wt%、Ag 34.35wt%和Te 35.45wt%。该矿床可以与国际上典型的浅成低温热液Au-Ag-Te矿床对比。

Abstract: Sandaowanzi gold deposit in the northern Daxing′anling belongs to mesothermal-epithermal type. The gold bearing quartz veins are hosted by trachyandezite and trachyandezite brecia of lower Cretaceous Tamulangou formation. Optical Microscope and Scanning Electron microscope analyses with EDX indicate that tellurium-bearing gold mineral assemblage is the dominant gold-bearing minerals present in the ore vein. It is shown from statistical analysis that Au, Ag and Te contents are respectively, Au: 30.20 wt %, Ag: 34.35 wt %, and Te:35.45%wt. Based on the gold bearing mineral assemblages and metallogenic setting, the Sandaowanzi gold deposit may be comparable with typical epithermal Au-Ag-Te deposits in the world.