青海省牙扎曲金矿床地质特征及找矿方向

Geological characteristics and exploration prospects of Yazhaqu gold deposit in Qinghai Province

为明确找矿方向,给区域同类型金矿勘查提供依据,总结了青海省牙扎曲金矿床的地质特征,分析了NW向次级断裂及韧性剪切带对金矿床的控制作用,并进一步探讨该金矿床的控矿因素、矿床成因及找矿方向。结果表明:牙扎曲金矿床处于昆仑山口—玛多—甘德断裂与可可西里—金沙江断裂之间,发育NW向次级断裂及韧性剪切带,在破碎蚀变带与韧性剪切带内出露大量含金石英脉;巴颜喀拉山群清水河组的砂岩和板岩中Au、Ag、Pb、W含量较高,为该矿床提供了物质来源;NW向次级断裂、韧性剪切带及含金石英脉是富集成矿的有利部位,发育与金矿化相关的矿化蚀变,说明该矿床是典型的构造蚀变岩型、石英脉型金矿床,区内NW向次级断裂及韧性剪切带可作为下一步找矿方向。

In order to ascertain the exploration prospects and provide reference for gold deposit survey with same type,the researchers in this paper summarized the geological characteristics of the Yazhaqu gold deposit,and investigated the controlling factors of NW-trending secondary faults and ductile shear zones on the gold deposit.And the ore-controlling factors,genesis and exploration prosrects of the Yazhaqu gold deposit are also discussed.The results show that the Yazhaqu gold deposit is located between the Kunlun Pass-Maduo-Gander fault and the Keke-xili-Jinshajiang fault,with well-developed NW-trending secondary faults and ductile shear zones.A large number of gold-bearing quartz veins are exposed in fractured alteration zones and ductile shear zones.The content of Au,Ag,Pb,and W of sandstone and slate is high in Qingshuihe Formation of Bayankalashan Group,which provides a material source for the deposit.The NW-trending secondary fault,ductile shear zone and gold-bearing quartz veins are favorable locations for enrichment and integration.The mineralization alteration related to gold mine is well developed,indicating that the deposit is typical tectonic altered rock type and quartz vein type.The NW-trending secondary fault and ductile shear zone in the area are the next prospecting direction.