河南省五龙潭金矿床地质特征及成因探讨

ANALYSIS OF GEOLOGICAL CHARACTERISTICS AND GENESIS OF GOLD DEPOSIT IN WULONGTAN REGION OF HENAN PROVINCE

河南省内乡县五龙潭是东秦岭勘探程度较低的重要金矿产地之一。为查明五龙潭金矿床各地质要素和成矿机理,服务于找矿靶区圈定与金矿资源评估,以五龙潭地区区域基础地质资料、金矿露头和老硐资料为依据,通过野外地质调查、槽探与老硐编录采样及测试,开展综合分析。研究结果表明:五龙潭金矿赋矿层段为二郎坪群小寨组,圈定5条金矿脉,金矿脉长290~900 m,厚度一般0.1~1.7 m,矿石平均品位1.93×10-6。矿石中金矿物主要为自然金,矿石类型主要为石英脉型金矿石。成矿阶段划分为热液期和表生期,该矿床为中低温热液型金矿床。

A gold deposit in Wulongtan region,Neixiang county of Henan province,is one of the important gold ore fields in East Qinling. The exploration degree is low and the prospect of gold resources is not clear. To find out the geological factors and metallogenic mechanism of Wulongtan gold deposits,serving the ore-prospecting target zone and gold resources evaluation,based on Wulongtan regional geological data,outcrops and old mining,through geological field survey,trenching and old mining logging sampling and testing,the comprehensive analysis was done. The results show that the ore-bearing section Wulongtan gold deposit is Xiaozhai formation of Erlangping group,and five gold veins are defined. The length of gold veins is 290 ~ 900 m,the thickness is generally 0. 1 ~1. 7 m,and the average grade of ore is 1. 93 × 10-6. The gold mineral in ore in mainly natural gold,and the ore type is Quartz vein type gold ore. The metallogenic stage is divided into hydrothermal stage and supergene stage. The ore is mid-low temperature hydrothermal type gold deposit.