云南省会泽县大水井铅锌矿成矿规律及找矿预测

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英文篇名：Metallogenic Regularity and Prospecting Prognosis of Dashuijing Pb-Zn Deposit in Huize County,Yunnan Province 作者：胡加昆 ; 陶猛 ; 王远高 ; 赵福国 ; 杨福全 ; 李应武 英文作者：Hu Jiakun;Tao Meng;Wang Yuangao;Zhao Fuguo;Yang Fuquan;Li Yingwu;Yunnan Metallurgical Resources Group Co.,Ltd.; 关键词：铅锌矿 ; 构造叠加晕 ; 构造热液蚀变型矿床 ; 成矿规律 ; 找矿靶区 ; 深部找矿 英文关键词：Pb-Zn deposit;;Tectonic superimposed halo;;Tectonic hydrothermal alteration deposit;;Metallogenic regularity;;Prospecting target area;;Deep prospecting 中文刊名：JSKS 英文刊名：Metal Mine 机构：云南冶金资源股份有限公司; 出版日期：2019-07-15 出版单位：金属矿山 年：2019 期：No.517 语种：中文; 页：JSKS201907023 页数：10 CN：07 ISSN：34-1055/TD 分类号：140-149

摘要

云南省会泽县大水井铅锌矿处于扬子地块之上扬子古陆块的滇东被动陆缘铅锌多金属成矿带,矿体赋存于下石炭统摆佐组(C_1b)地层中。前人的找矿研究区域仅限于会泽10~#矿体南延、88~#～138~#地质勘探线、标高1 261～1 031 m等区域,对大水井其余区域涉及较少,未提出明确的找矿方向。通过对区域成矿地质背景、矿区地质特征、矿体特征、矿石特征、围岩蚀变、成矿规律进行分析研究,结合前期开展的构造叠加晕预测了新的找矿靶区,并开展了靶区验证工作。研究表明:①矿体呈似层状产于粗晶白云岩中,长大于395 m,垂高258 m,平均厚度4 m,产状132°∠56°;②矿石矿物主要为闪锌矿、菱锌矿、异极矿、方铅矿、白铅矿和黄铁矿,脉石矿物主要为粗晶白云石和方解石;矿石结构主要为晶粒结构、半自形晶粒状结构、交代结构、共边结构、网脉状结构、乳浊状结构等,矿石构造主要为块状构造、条带状构造、似层状构造、脉状构造等;③围岩蚀变有白云石化、黄铁矿化、方解石化、褪色作用等;④大水井铅锌矿受地层、岩性、构造控制,找矿的基础条件为地层,找矿的重要标志为岩性和热液蚀变,找矿重点地段为控矿构造,该矿床成因属构造热液蚀变型铅锌矿床;⑤根据大水井矿区已揭露的矿床地质特征及控矿因素,圈定了1~#、2~#、3~#3处找矿靶区,通过对1~#靶区局部开展验证工作,探获大水井铅锌矿I~#矿体铅锌矿石量115.90万t,金属量铅54 133 t、锌175 238 t,共生硫元素量223 182 t,伴生组分金属量银31 785 kg、锗44 615 kg、镉393 155 kg,总体上1~#靶区找矿潜力巨大,2~#靶区找矿潜力较大,3~#靶区具有一定的找矿潜力。
        Dashuijing Pb-Zn Deposit in Huize County of Yunnan Province is located at the Pb-Zn polymetallic metallogenic belt of the passive continental margin of Eastern Yunnan Province of the upper Yangtze continental block of Yangtze massif,the orebodies occur in Baizuo Formation(C_1b) of Lower Carboniferous.Previous prospecting studies are limited to the south extension of the 10~#orebody of Huize County,88~#～138~# geological exploration line and the elevation of 1 261～1 031 m.There are few study results on the other areas of Dashuijing area,and no clear prospecting directions have been proposed.Through the analysis and study of regional metallogenic geological background,geological characteristics of the mining area,orebody characteristics,ore characteristics,surrounding rock alteration and metallogenic regularity,combined with the the tectonic superimposed halo by early prediction,new prospecting target areas are delineated and some related validation work is done.The study results show that:①the orebodies are stratified in coarse-crystalline dolomite,the lengths of them are larger than 395 m,vertical height of them is 258 m,average thickness of them is 4 m,occurrence information of them is 132°∠56°;②the ore minerals are mainly for sphalerite,calamine,heteropolar,galena,cerusite and pyrite,the gangue minerals are mainly for coarse crystal dolomite and calcite,the ore structures are mainly for grain structure,semidiomorphic crystalline structure,metasomatism structure,common edge structure,net vein structure and emulsion structure,the ore structures are mainly for blocky structure,banding structure,layer-like structure,veined structure,etc.;③the surrounding rock alterations are mainly for dolomization,pyritization,calcilization,fading effect,etc.;④Dashuijing Pb-Zn Deposit are controlled by strata,lithology and structure,strata is the basic condition for prospecting work,lithology and hydrothermal alteration are the important prospecting indicators,ore-controlling structures are the key areas for prospecting work,the deposit genesis belongs to tectonic hydrothermal alteration Pb-Zn deposit;⑤according to the geological characteristics and ore-controlling factors of the exposed orebodies in Dashuijing mining area,three prospecting target areas(named 1~#,2~#and 3~#) are delineated.Through the validation work of the local area of 1~# prospecting target area,following results are obtained,the amount of Pb-Zn ore of 1~#orebody is1.159×106 t,Pb metal amount is 54 133 t,Zn metal amount is 175 238 t,symbiotic sulfur amount is 223 182 t,the associated components are 31 785 kg(Ag),44 615 kg(Ge) and 393 155 kg(Cd).Generally,the prospecting potential in 1~# target area is huge,prospecting potential of 2~# target is large,but the prospecting potential of 3~#target area is inferior to the other two areas.

引文

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