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四川会东淌塘铜矿矿床地质特征及找矿标志

Geological Characteristics and Prospecting Indicator of Tangtang Copper Deposit in Huidong County,Sichuan Province
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摘要 淌塘铜矿为四川会理—会东铜多金属矿集区内的层控型矿床之一,发育典型的"东川(淌塘)式"铜矿。为进一步指导淌塘铜矿床深、边部接替资源找矿工作,分析了区域成矿地质背景,并依据淌塘铜矿床的最新地质勘查结果,深入分析了矿体产出特征、矿物组构特征、蚀变特征等,并对矿床成因进行了讨论,对找矿标志进行了总结。研究表明:(1)矿区出露的地层以前震旦系会理群淌塘组(Pt_2t)变质岩系为主,岩性主要为千枚岩及白云质大理岩;(2)矿体均赋存于淌塘组中亚组第二段中层(Pt_2t_2^(2-2))内,呈层状、似层状及透镜状产出,矿体厚度及品位变化较均匀;(3)矿床内的金属矿物以黄铜矿、黄铁矿为主,发育浸染状、条带状、网脉状矿石构造,显示沉积及热液成矿特征;(4)赋矿围岩作为初始矿源层,在后期热液作用下进一步活化迁移,沿断裂及破碎带充填叠加,矿床成因类型为沉积—改造型铜矿床;(5)矿区地层、构造、蚀变及地球化学异常为重要的找矿标志。 Tangtang copper deposit is one of the strata-bound type deposits in Huili-Huidong copper polymetallic ore-concentrating area,which occurred typical " Dongchuan( Tangtang) type" copper deposit. In order to provide reference for the deep/edge prospecting work of the Tangtang copper deposit,the regional metallogenic geological background is analyzed,based on the geological exploration results newly obtained in the mining area,the ore-bodies occurrence characteristics,mineral fabric features and alteration characteristics are discussed in detail,besides that,the deposit genesis is studied and the prospecting indicators of the mining area are also summarized systematically. The study results show that:(1)the strata occurred in the mining area is mainly for the metamorphic rock series in Tangtang Formation( Pt_2t) of Huili Group of Early Sinian,which developes phyllite and dolomite marble;(2)the ore-bodies are occurred in middle layer of the second stage of Middle Tangtang Formaiton( Pt_2t_2^(2-2)),which is characterized by layered,stratiform-like and lenticular,the grade and thickness of the ore-bodies changed evenly;(3)the metallic minerals of the copper deposit are mainly for chalcopyrite and pyrite,which develop the dissemination ore structure,streaked ore structure and net-vein ore structure,and show the sedimentary metallogenic feature and hydrothermal metallogenic feature;(4)the ore-hosting rock are effected on activation and transportation by late tectonic hydrothermal solution,and superimposed along the faults and fracture zone,acting as main source bed,the deposit genesis is belongs to sedimentary-reformation type copper deposit;(5)the strata,structure,alteration and geochemical anomaly can be regarded as the favorable prospecting indicators in the mining area.
出处 《现代矿业》 CAS 2018年第1期48-53,共6页 Modern Mining
基金 云南省科技惠民计划项目(编号:2013CA019)
关键词 沉积—改造型铜矿 层控型矿床 深部找矿 矿床地质特征 矿床成因 找矿标志 Sedimentary-reformation copper deposit, Strata-bound type deposit, Deep prospecting,Geological characteristics of deposit, Deposit genesis, Prospecting indicator
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