谢家沟剪切带蚀变岩型金矿床地质特征及成因初步探讨

Geological features of Xiejiagou gold deposit and preliminary study on its genesis

谢家沟金矿床是一个新发现的矿床。在讨论成矿地质背景基础上,分析了矿床地质特征及其成因。认为谢家沟金矿床是同韧性剪切带蚀变岩型金矿床,焦家断裂带与招平断裂带的差异性构造运动为成矿提供了剪切应力场背景,成矿物质来自地壳和地幔;矿区划分5套构造系统:成矿期的韧性剪切带系统、近东西向的平移断裂系统、北东—南西向拉张应力背景下的构造系统、北东或近南北向的硫铁矿期断裂构造系统、北东向压扭性断裂系统;从剪切蚀变岩带的中心往两侧,岩石蚀变和含矿性具有明显的分带现象。

Xiejiagou gold deposit is a new found deposit. Its geological features and genesis is studied based on its geologic background. It is a ductile shear zone-altered rock deposit, the differential tectonic movement of the Zhaoping fault belt and Jiaojia fault belt offers the shearing stress field for the formation of gold deposit, and the ore-forming material comes from crust and mantle. In the ore deposit region, structure system can be divided into ductile shearing structure system during metallization, parallel displacement fault system (nearly EW strike), tensile stress structure system (NW strike), NE strike fault system during and NE strike compresso-shear fault system. From the center of main shearing altered belt to two sides, the gold content and alteration of rock show obvious zonation.