黔西北仰天窝铅锌矿床地质特征及找矿方向探讨

仰天窝铅锌矿床的产出主要受NW向的纵向断裂控制;SN、NNE向的横向断裂多对矿体起到破坏作用,可能是使原生矿体破坏后再次富集,形成砂矿体、氧化矿体的主要因素之一。石炭系马平组地层为矿体主要产出层位。矿体与围岩有着明显的电性差异,电法找矿具备良好的地球物理条件。电阻率小于200Ω·m,极化率为10%~20%,是该区寻找同类型铅锌矿最为稳定的物性参数。F_1、F_2、F_(32)、F_(35)、F_(34)等纵向断裂及其次级断裂为矿区主要容矿构造。F_1、F_2、F_(32)与F_(14)、F_(15)所控制的马平组地层,在1300~1500m标高范围应是今后找矿工作的重点。

Geological characteristics and prospecting direction of Yangtianwo Pb-Zn deposit in northwest Guizhou

The occurrence of Yangtianwo Pb-Zn deposit is mainly controlled by the NW-trending longitudinal fracture.The NS-trending and NNE-trending lateral fractures usually have destruction effect on the orebod-ies,which may be one of the major causes of the formation of alluvial orebodies and oxidized orebodies.The strata of Carboniferous Maping Formation is the major occurrence horizon of the orebodies.Due to the obvi-ous electrical property difference between the orebodies and its wall rocks,electric prospecting method has favorable geophysical conditions.The most stable physical property parameters for prospecting of same type of Pb-Zn deposits in this area include resistivity of less than 200Ω·m and polarizability of ranging from 10%to 20%.Major host structures in the mining area are longitudinal fractures and their secondary fractures like F1 ,F2 ,F32 ,F3 5 and F34 .It appears that strata of Maping Formation at elevation from 1300m to 1500m which is controlled by F1 ,F2 ,F32 and F1 4 ,F1 5 might be the target of prospecting works in the future.