冀东冷口断裂带北侧金矿地质特征及远景预测  

Geological Characteristics and Potential Prediction of Gold Deposit on the North Side of Lengkou Fault Zone in Eastern Hebei

作　　者：王久良[1] 武峰[1] 赵靖雯[1] 杨爱雪 WANG Jiu-liang;WU Feng;ZHAO Jing-wen;YANG Ai-xue(The Fifth Geology Company of Hebei Geology and Minerals Bureau, Tangshan 063000,China)

机构地区：[1]河北省地矿局第五地质大队,河北唐山063000

出　　处：《东华理工大学学报（自然科学版）》2021年第5期462-471,共10页Journal of East China University of Technology(Natural Science)

基　　金：河北省地质勘查基金项目(冀国土资勘字〔2016〕037号)。

摘　　要：为了扩大冀东冷口断裂带北侧金矿的找矿成果,通过对冀东冷口断裂带北侧典型金矿床进行野外地质调查,利用岩相学及地球化学等方法,对区内金矿床成矿地质特征、找矿标志以及成因联系进行了较为深入的研究。研究表明:清河沿金矿矿石类型主要为角砾岩型,金矿物主要为自然金,围岩蚀变较弱;长城金矿矿石类型主要为白云岩型和蚀变闪长玢岩型,自然金仅在个别矿石中可见,含量极少,呈细粒显微金颗粒分布于黄铁矿晶隙间,围岩蚀变较强,其中褐铁矿化、硅化、铁白云石化为区内的找矿标志。本区Au含量为(0.43~538.59)×10^(-9),平均为64.22×10^(-9);其含量与As、Co、Ni、Pb、Hg的含量呈正相关,金含量高低与铁白云石化的强弱呈正相关。金矿成矿物质来源于太古宙变质岩结晶基底;成矿热液为岩浆热液与天水混合形成的含矿流体;金矿的形成与构造及深部含铁热液的活动关系密切。冷口断裂带深部找矿远景区为北东方向及Pb、As、Hg等异常区和地层中Fe含量高的地区。In order to expand the prospecting achievements on the north side of Lengkou fault zone in eastern Hebei,field geological surveys have been carried out,and by the application of petrographical analysis and geochemical analysis,the metallogenic geological characteristics,prospecting marks and genetic relations of Lengkou fault zone in eastern Hebei are more intensively studied.The research results can be summarized as follows,the ore type in Qingheyan gold deposit is mainly breccia type gold ore,and the gold minerals exist in forms of natural gold with week wall-rock alteration.The ore types in Changcheng gold deposit are mainly dolomite type and altered diorite porphyrite type,and the natural gold can only be found in forms of microscopic gold particles in few individual ores,which are mainly distributed in the pyrite crystal caps with strong wall-rock alteration.Among them,ferritization,silicification and iron dolomitization are the ore prospecting marks in this area.The contents of Au in this area range from 0.43×10^(-9) to 538.59×10^(-9),with an average value of 64.22×10^(-9).Gold was positively correlated with As,Co,Ni,Pb and Hg,and the gold content was positively correlated with the strength of iron dolomitization.The metallogenic materials are derived from the crystalline basement of archean metamorphic rocks.The ore-forming hydrothermal fluid is formed by mixing magmatic hydrothermal fluid with meteoric water.The formation of gold deposit is closely related to the tectonic and deep iron-bearing hydrothermal fluid activities.The areas with Pb,As,and Hg anomalies and the areas with high Fe content are the ore-prospecting targets,which are distributed in the north-east direction in Lengkou fault zone.The research results point out the ore-prospecting direction in this area.

关 键 词：金矿床 冷口断裂带 成矿规律 远景预测 

分 类 号：P618.51[天文地球—矿床学]