广东白云地铅锌矿床断裂构造特征及其找矿意义

The prospecting sinificance of fault structure in Baiyundi Pb-Zn deposit,Guangdong

广东白云地铅锌矿床位于三洲盆地矿集区,地处NE向恩平—从化深断裂带、EW向高要—惠来深断裂带及NW向西江大断裂的交汇处,其成矿作用与断裂构造关系密切。重点对矿床构造特征进行分析,并结合区域成矿作用探讨成矿机制及找矿前景。结果表明:F2是本区的主要导矿构造,其旁侧的次级张性断裂是主要的容矿构造,成矿流体经F2运移至本区在次级张性断裂中析出成矿;矿区东部西江断裂与高要—惠来断裂交汇处,构造应力集中,次生张性断裂发育,距离矿源较近,且在新构造运动中未抬升剥蚀,是本区的首选找矿靶区。

Baiyundi Pb-Zn deposit is located in the ore-concentrated area of Sanzhou basin,which is situated on the intersection of Enping-Conghua deep fault zone in NE,Gaoyao-Huilai deep fault zone in EW and Xijiang large fault in NW.The mineralization is closely related to the fault structure.On the basis of analysis on the structural feature of the deposit,and regional metallogenesis,the paper has discussed the metallogenic mechanism and prospecting potential of the deposit.The result indicates that F2 fault is the important ore-conducting structure and its secondary fractures are ore-hosted structures of the deposit.The ore-forming fluid is transported to this area to precipitate ore-forming metal in the secondary tensile fractures of F2 fault.At the intersection of Xijiang fault and Gaoyao-Huilai fault in the east of the mining area,the structural stress is concentrated,the secondary tensile fractures are developed,it is close to the ore source,and there are not uplifted and eroded during the Neotectonic movement.It is the first prospecting target area in this area.