河北坝营石英脉型金矿床地质特征及找矿标志

摘要

坝营石英脉型金矿床位于河北丰宁凤山一带，张家口—丰宁—承德 EW 向金矿成矿带东段。矿床由13个金矿体构成，矿体呈脉状、长透镜状和豆荚状，其形态与产状严格受断裂破碎带和含金石英脉控制。矿床围岩蚀变强烈，主要为硅化、绢云母化、黄铁矿化、绿泥石化和碳酸盐化。金矿化主要发育在石英—多金属硫化物阶段。该矿床具有明显的断裂构造、含金石英脉、蚀变矿化、线状磁异常及线状激电异常等地质与地球物理找矿标志。通过分析坝营石英脉型金矿床地质特征及地质与地球物理找矿标志，指出该区具有寻找中型石英脉型金矿床的找矿潜力。%Baying quartz vein type gold deposit is located in the Fengshan area of Fengning,Hebei Province, which is the eastern part of Zhangjiakou-Fengning-Chengde gold metallogenic belt.The quartz vein type gold deposit occurs in the gold-bearing quartz veins of NWW fractured shatter zones.The ore bearing strata is Dantanzi group,Archean.The deposit consists of 13 known gold orebodies,in which I, III,VI orebodies are scale while others are small and lean.The shape and occurrence of orebodies are strictly controlled by fractured shatter zones and gold-bearing quartz veins.The orebodies occur as veins,long lens and podiform,which strike NWW.The wall rock of deposit is intensively altered,showed low to moderate temperature hydrothermal alteration,which is mainly manifested as silicification,sericitization,pyritization,chloritization and carbonatization.Gold mineralization is mainly developed in the quartz-polymetal sulphide stage.The gold deposit has obvious geological,geophysical prospecting criteria,including fracture structure,gold-bearing quartz vein,the mineralization and alteration,linear magnetic anomaly and linear polarization anomalous,etc.Through analyzing the geological characteristics,and geology,geophysical prospecting criteria of the quartz vein type gold deposit,this paper points out that it has the prospecting potential for medium quartz vein type gold deposit in this area.