青海熊沟地区金、铜矿体地质特征及找矿标志

Geological characteristics and prospecting indicator of gold and copper deposits in Xionggou area,Qinghai

熊沟地区位于两个三级构造单元的结合处,构造形态复杂。勘查区研究程度较低,矿体地质特征、产出部位尚不明确。通过地质填图、化探、物探、探矿工程等一系列综合勘查手段查明了熊沟地区的地层、岩浆岩、构造和化探土壤异常等方面特征,总结该区金、铜矿床地质特征及找矿标志,为确定异常源、寻找新的金铜矿体以及评价找矿远景提供理论依据;通过对熊沟金、铜矿点赋存地段的揭露控制,确定金、铜矿体产于前寒武系北东向断裂破碎蚀变带内。矿体的分布明显受断裂构造控制,矿化主要分布在石英脉的边缘部位或脉的裂隙中,矿体(点)的产出与脉岩密切相关。

Xionggou area is tectonically complex and located on the intersections of three tectonic units. The geological study on the region is unsubstantial, which resulted in the attitude and occurrence of the orebody are unclear. By geological mapping, geochemical, geophysical, prospecting works and a series of integrated exploration methods, areas of Xionggou formation,magmatic rocks, struc- ture, soil anomalies and mineralization characteristics were clearly identified;In views of the geological characteristics and available prospecting criteria,the authors provide a useful insight into the new discovery of anomalous areas,Au and Cu orebodies. Detailed study on the host rocks of Au and Cu mineralized sites in Xionggou area,suggesting the Au and Cu orebodies are hosted in the NE -striking faults of Precambrian strata. The distribution of orebodies has obviously controlled by faults, mineralization mainly took place in the edge and fractures of quartz veins,the occurrence of orebodies has a closely relationship with dykes.