甘肃大店沟金矿床蚀变矿物特征与金矿化的关系

The relationship between alteration mineral characteristics and gold mineralization in Dadiangou gold deposit,Gansu

大店沟金矿床位于西秦岭成矿带上,其矿体类型为石英脉型和构造破碎带蚀变岩型。通过对该区岩石样品进行近红外光谱分析仪测试,确定大店沟金矿床围岩蚀变类型、蚀变矿物含量及特征,并讨论围岩蚀变与金矿化之间的关系。结果表明,该矿床的主要蚀变类型有绢云母化、绿泥石化、黄铁矿化、硅化及碳酸盐化。白云母、锂云母、伊利石、绿泥石等矿物与金矿化呈正相关性,蚀变矿物含量与区内揭露矿体空间位置及规模相对应,后期可作为较好的找矿标志性信息。

Dadiangou gold deposit is located in West Qinling metallogenic belt.The ore body types are quartz vein type and structural fracture zone alteration rock type.Through near infrared spectrometer testing of rock samples,the types of wall rock alteration,the content and characteristics of altered minerals in Dadiangou gold deposit are determined.The relationship between wall rock alteration and gold mineralization is discussed.The results indicate the main alteration types of Dadiangou gold deposit are sericitization,chloritization,pyritization,silicification and carbonation.Muscovite,lepidolite,illite,chlorite and other minerals are positively correlated with gold mineralization.The content of altered minerals corresponds to the spatial location and scale of the exposed ore bodies in the area.It can be used as the good prospecting indicator information in the later stage.