江西省德兴市铁罗山金矿床地质特征及找矿远景

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Serial No.577 Mav.2017 现代矿业 MODERN MINING 总第577期 2017年5月第5期 

江西省德兴市铁罗山金矿床地质特征及找矿远景 

谢国子 

(江西有色地质矿产勘查开发院) 

摘要铁罗山金矿是在德兴铜矿北部首次发现的独立矿床,该矿床的发现丰富了花岗斑岩 体外围的金矿成矿理论,并开启了在该铜矿北部找金的序幕。结合相关地质工作成果,分析了成矿 

地质背景、矿区及矿床地质特征、矿床成因,研究表明:①矿床处于赣东北韧性剪切蛇绿岩构造混杂 岩带中,近EW向展布的杜村背形与NNE向陡倾斜断裂构成了矿区的基本构造格架,控制着矿区 

成矿、容矿构造——大坞坂韧性剪切变形带的产出;②大坞坂韧性剪切带在形成及演变过程中,带 内构造岩及其近侧围岩均遭受不同程度的蚀变,其中与金矿化关系密切的主要有绢云母化、硅化、 

黄铁矿化、方铅矿化、铁白云石化、褪色化等;③矿区可划分为石英一绢云母-黄铁矿.铁白云石化带 (Qtz-Ser-Py-Fer)、绿泥石一方解石一绢云母化带(Chl—Cal—Ser)等两个构造蚀变带;④矿床具有多阶段 演化、多因复成的特点,历经火山沉积、区域变质、动力变质及岩浆热液叠加富集等成矿过程,矿床 

成因为受韧性剪切带控制的变质热液型金矿床。在上述分析的基础上,进一步讨论了找矿标志及 找矿远景,分析认为:①矿床构造位置及其蚀变构造岩组合、赋矿地层及岩石组合、与金矿化关系密 

切的围岩蚀变组合均为有利的找矿标志;②杜村背形与NNE向断裂交汇形成的断陷带为“铁罗 山”式金矿找矿远景区,此外,矿区深部钻孔中绿泥石化增强,金属硫化物增多,表明区内深部成矿 

热液作用将会增强,更深部可能存在铜金复合矿体。 关键词金矿成矿地质背景地质特征 围岩蚀变矿床成因 找矿标志找矿远景 

Geological Characteristics and Prospecting Potential of Tieluoshan Gold Deposit in Dexing County,Jiangxi Province Xie Guozi (Jiangxi Institute of Nonferrous-metal and Geological Exploration and Development) Abstract Tieluoshan gold deposit is the independent gold deposit that is found firstly in north of Dexing copper deposit,the gold metallogenic theory of porphyry granite periphery is enriched by the foun— 

dation of Tieluoshan gold deposit,and the gold prospecting work of the north of Dexing copper deposit is activated.Combing with some related geological working results of Tieluoshan gold deposit,the metallo— 

genic geological background,geological characteristics of mining area and deposit,deposit genesis are dis— cussed,the results show that:( ̄the deposit is occurred in the tectonic melange rock belt of ductile shear 

ophiolite of the northwestern Jiangxi Province,the basic structural framework of the mining area is formed by the nearly EW—direction distribut.ion Ducun antiformal and NNE—direction steep inclined fracture,and the occurrence of the metallogenic and ore-hosting structure(Dawuban ductile shear deformation belt)is controlled by the basic structure framework in the mining area;②in the process of formation and evolution of the Dawuban ductile shear deformation belt,the tectonite and its proximal surrounding rock are altered in different degree,among them,the alterations closely with gold mineralization are mainly for sericitiza- tion,silicification,pyritization,galena mineralization,iron dolomitization,fade,etc.;@the mining area can 

谢国子(1983一),男,工程师,330001江西省南昌市井冈山大道 361号。

 谢国子:江西省德兴市铁罗山金矿床地质特征及找矿远景 2017年5月第5期 

be divi(1ed int0 tw()tectonic alteration belts,they are qua ̄z—sericite—pyrite—ferrodolomite(Qtz—Ser—Py-Fer) tectonic a1terali0n belt and ch】0rite—caMte.sericite(Chl—Cal—Ser)tectonic alteration belt;④the deposit with the characteristics of multistage evolution and multi—genesis metallogenic,the metallogenic process of 

the deposit are volcanic sedimentary,regional metamorphism,dynamic metamorphism and magmatic hy一 (trotl1ermal super-imposed enrichment,the genesis of the deposit is the metamorphic hydrothermal type gold 

(1eposit( ()ntr()lied by ductile shear I)eh.Based on the above analysis results,the prospecting indicators and 

prospecting potential of the mining area are also analyzed,the resuhs show that:①the deposit tectonic po— siti()n and its ahered tectonite combination.ore—hosting strata and rock combination,surrounding rock al— teration com1)ination eh)sely related to gold mineralization are the favorable prospecting indicators in the 

mining area;②the fault depressed beh formed by the intersection of Ducun antiformal and NNE-direction faults is the prospecting potential area of the”Tieluoshan type”gold deposit,besides that,the enrichlnent 

degree ot chloritization is enhanced il1 the depth of mining area by drilling.the contents of metal sulfides i T1 tt1e strata is increased.which in(tieated that the metallogenic hydrothermal process will be increased, Cu.Au complex 0I℃.body maybe existed in the more depth of mining area.The above analysis results relat— 

ed to the geological(・haracteristics alul prospecting potential of Tieluoshan gold deposit can provide sonic 

refer・ence for the further prospecting WOI’k(’f gold deposit and Cu—Au complex deposit in the area. Keywords Gold deposit,Regional metallogenie geological background,Geological characteristics, Surrountling rock aheration,Deposit genesis,Prospecting indicator,Prospecting potential 

德兴地区是我国著名的金铜多金属矿集区,分 布于 内的铜厂、银山和金山构成的三角地带。以 铜厂、朱砂红和富家坞组成的德兴斑岩铜矿田定位 

于NW向断裂带的岩体侵位空间;银I【】铜金银铅锌 多金属矿田属火Jl卜_一次火…热液型,定位于银山断 

裂褶皱带及岩体侵位空间;铜厂南两部的金I LJ金矿 田内分布有金1lJ、西蒋和石坞等十多个大、中型金 矿,定位于低角度的韧性剪切带内,金储量已超过 

200 t 近20余年来,为在德兴铜矿斑岩体周边寻找 “金I 式”金矿,各类地勘、矿li1等单位对铜矿外围 

开展_r大量的地质工作,铁罗山金矿床的发现并成 功勘查为在该铜矿北部找矿打开了新局面。本研究 

结合相关地质勘探成果,对铁罗山金矿床地质特征 进行分析,并埘其成因及找矿远景进行讨论,供区内 进一步开展找矿工作参考