南城县蔡田地区金矿成矿地球物理特征及找矿潜力分析

Analysis of Geophysical Characteristics and Prospecting Potential of Gold Deposits in Caitian Area of Nancheng County

通过综合分析南城蔡田地区以往地质资料,研究成矿地质条件及控矿因素,结合已知地质剖面,对区内地球物理特征、矿化特征进行分析;在此基础上,有针对性地开展以直流激发极化法为主的电法勘探,结合已知矿区地球物理异常特性,归纳总结矿化带电性特征。研究结果表明,风化壳型金矿是地表风化层中极化率高,异常呈片状,分布与构造无关;变质—热液型金矿则是深部构造上盘极化率高,异常呈团块状、鸡窝状;区内浅部风化层中是寻找风化壳型金矿有利地段,深部F1构造上盘是寻找变质—热液型金矿有利地段,并且显示该区深部找矿潜力优越。

Through the comprehensive analysis of previous geological data in Caitian area of Nancheng,the metallogenic geological conditions and ore-controlling factors are studied.Combined with the known geological profile,the geophysical characteristics and mineralization characteristics in the area are analyzed.On this basis,the electrical prospecting based on DC induced polarization method is carried out.Combined with the geophysical anomaly characteristics of known mining areas,the characteristics of mineralization electrification are summarized.The results show that the weathering crust type gold deposit is characterized by high polarization rate in the surface weathering layer,and its anomaly is sheet-like,and its distribution is independent of structure.Metamorphic-hydrothermal gold deposit is characterized by high polarization rate in the upper plate of deep structure,and the anomaly is lumpy and chicken nest.The shallow weathered layer in the area is a favorable area for finding weathered crust gold deposits,and the upper plate of deep F1 structure is a favorable area for finding metamorphic-hydrothermal gold deposits,and shows that the deep prospecting potential in this area is superior.