湖南江永水口脚铜多金属矿床控矿因素及找矿前景分析

Analysis on Ore-controlling Factors and Prospecting Potential of Shuikoujiao Copper Polymetallic Deposit in Jiangyong,Hunan Province

湘南地区处于著名的南岭纬向成矿构造带中西段,水口脚铜多金属矿床就处于该矿带中间“铜铅锌”地段。近年来在其邻区相继发现有众多铅锌矿床,并进行了较多的科研工作,但对水口脚铜铅锌矿床的研究较薄弱。因此,在矿区开展控矿因素及找矿前景分析对扩大该区铜资源储量具有重要意义。为明确下一步找矿方向,在野外地质调查基础上,结合以往勘查资料、中深部钻探成果,对区域成矿背景、矿床地质特征进行分析,讨论地层、构造、岩浆活动与成矿的关系,分析矿床控矿因素和成矿机制,并就找矿前景进行探讨。得出主要认识有矿体为岩浆和构造联合控制,燕山早期岩浆岩提供物源及热源;构造为成矿物质提供运移通道与容矿空间,区域基底构造控岩,区域盖层构造导矿,矿区次级构造容矿;矿区下一步找矿方向为对岩体外接触带脉型铜铅锌矿深部,即对矿化带自控制最深标高-400 m至成矿母岩埋深标高-800 m之间以及深部矽卡岩型铜多金属矿进行钻探验证。

The southern Hunan area is located in the central and western section of the famous Nanling latitudinal metallogenic structural belt,and the Shuikoujiao copper polymetallic deposit is located in the"copper-lead-zinc"section in the middle of the belt.In recent years,many lead-zinc deposits have been successively discovered in its neighboring areas,and more scientific research has been carried out.However,the research on the Shuikoujiao copper-lead-zinc deposit is relatively weak,therefore,the analysis of ore-controlling factors and prospecting prospects in the mining area is of great significance for expanding the copper resource reserves in the area.In order to clarify the prospecting direction of the next step,on the basis of field geological survey,combined with previous exploration data and drilling results in the middle and deep areas,the regional metallogenic background and the geological characteristics of the deposit were analyzed,and the relationship between formation,structure,magmatic activity and mineralization was discussed.Analyze the ore-controlling factors and metallogenic mechanism of the deposit,and discuss the prospecting prospects.The main understandings are as follows:the ore body is controlled by magma and structure,the early Yanshanian magmatic rocks provide the material source and heat source;the structure provides migration channels and ore storage space for ore-forming materials,regional basement structure controls rock mass distribution,regional cover structure conducts ore-containing solution,secondary structural ore-holding in the mining area;the next prospecting direction of the mining area is the deep contact with vein-type copper-lead-zinc deposits,that is,between the deepest elevation of the mineralized zone-400 m to the buried depth of the mineralization parent rock-800 m,and the deep skarn Type copper polymetallic ore for drilling verification.