冀北围场县龙头山地区银多金属矿地球化学异常特征及找矿模型

Evaluation of silver and polymetallic geochemical anomalies and ore-prospecting model in Longtoushan area of Weichang county,northern Hebei province

龙头山地区位于华北地台与内蒙-大兴安岭褶皱系分界线康保-围场大断裂北侧,主要出露中、新生界地层,零星发育太古界及古生界地层。在龙头山地区通过水系沉积物地球化学测量圈定了多个异常区,其中H-6-乙异常面积较大,浓集中心明显,元素相互套合较好;确定龙头山地区成矿元素组合为:Ag-Pb-Zn和Au-Cu-Mo-Bi。通过赋矿地层原生晕基本分析验证,显示该区为热液脉型银多金属矿的地球化学特征,具有中深部资源潜力。以地球化学信息和地质矿产信息为基础,结合槽探工程验证,提出了适合本地区的热液脉型银多金属找矿模型。

Longtoushan area is located in the north of Kangbao-Weichang fault,which is the boundary between North China platform and Inner Mongolia-Daxinganling fold system.The strata are mainly of Mesozoic and Cenozoic strata,and a small amount of Archaeozoic and Paleozoic strata are developed.In the Longtoushan area,many geochemical anomaly areas have been delineated by stream sediment geochemical survey.Among them the H-6-B anomaly area is large,and its concentration center is obvious,and the elements are well matched with each other.The ore-forming element assemblages in the Longtoushan area are Ag-Pb-Zn and Au-Cu-Mo-Bi.Through the basic analysis and verification of primary halo of ore bearing strata,it shows that this area is the geochemical characteristics of hydrothermal vein type silver polymetallic ore,which has the potential of middle and deep resources.On the basis of geochemical information and geological and mineral information,combined with the verification of trenching engineering,a hydrothermal vein type silver polymetallic prospecting model suitable for this area is proposed.