黑龙江省龙江县六九山铜银矿矿床地质特征及找矿标志

发布时间：2018-03-05 21:06

本文选题：六九铜矿　切入点：成矿地质特征　出处：《石家庄经济学院》2015年硕士论文　论文类型：学位论文

【摘要】：本文以黑龙江省龙江县六九铜银矿床为研究对象,依托“黑龙江省龙江县后六九山地区铜金矿详查”项目,运用野外大比例尺地质填图、物化探异常特征分析、槽探、浅井、钻探等野外工作方法及室内岩、矿光薄片鉴定,系统研究了成矿区内地层、构造、岩浆岩的分布、规模、产状等成矿地质条件,在此基础上,重点对六九铜银矿床的控矿构造、含矿岩系特征、矿体与侵入岩的关系、矿石矿物组成及矿石结构构造、围岩蚀变特征进行深入的研究,查明了六九铜银矿床的成矿地质特征及矿化标志。通过研究工作,获得了以下主要结论。1.六九铜银矿床位于松辽盆地西缘北北东向早白垩世中性—酸性火山岩带内,区内断裂构造为岩浆活动提供了空间和动力。研究表明：区内华力西晚期和中燕山晚期岩浆岩分布广泛,其中中燕山晚期花岗斑岩是本区铜矿的主要成矿母岩,对成矿作用起着控制作用。2.六九铜银矿区位于后六九-前六九山北西向断裂带与西六九山-前六九山东西向断裂带的交会处,即前六九山火山机构的南部。矿床受基底东西向断裂破碎带与火山隐爆角砾岩带的复合构造部位控制,矿体产于该火山隐爆角砾岩中。3.矿区围岩蚀变较强,该蚀变带主要发育于隐爆角砾岩中,规模也与隐爆角砾岩相当。主要蚀变为硅化、绢云母化,矿化为黄铜矿化、黄铁矿化、褐铁矿化等。4.六九铜银矿矿床的化探异常由Au、Ag、Cu、Pb、Zn、Mo六种元素的单元素异常组成,该异常呈北东向不规则状展布,异常套合紧密,强度高,规模大。当化探异常与激电异常吻合时,可作为直接找矿标志。5.矿体主要产在隐爆角砾岩中,呈不规则脉状、透镜状产出。矿石矿物主要为黄铁矿、黄铜矿、闪锌矿,矿石结构主要为他形粒状结构、固溶体分离结构、包含结构以及由充填作用形成的脉状结构等,矿石的构造主要为块状构造、浸染状构造和角砾状构造。6.根据成矿地质条件、矿体产出特征、控矿构造、围岩蚀变等特征,初步认为本矿床为中低温热液充填型铜银矿床,成矿时代为中燕山晚期。
[Abstract]:Taking the Liujiu copper and silver deposit in Longjiang County, Heilongjiang Province as the research object and relying on the project of "detailed investigation of copper and gold deposits in Houliujiushan area, Longjiang County, Heilongjiang Province", this paper applies field large-scale geological mapping, geophysical and geochemical exploration anomaly analysis, trough exploration, shallow wells, etc. On the basis of field working methods such as drilling and identification of indoor rocks and thin sections of ore deposits, the distribution, scale and occurrence of ore-forming geological conditions such as the interior layers, structures, magmatic rocks, etc., the ore-controlling structures of the Liujiu copper and silver deposit are emphasized. The characteristics of ore-bearing rock series, the relationship between ore bodies and intrusive rocks, the mineral composition and structure of ores, and the alteration characteristics of surrounding rock are studied in depth, and the ore-forming geological characteristics and mineralization marks of Liujiu copper silver deposit are found out. The main conclusions are as follows: 1.The Liujiu Cu-Ag deposit is located in the early Cretaceous Neutral-acid volcanic rock belt in the west margin of Songliao Basin. The fault tectonics in the area provide space and power for magmatic activity. The study shows that magmatic rocks are widely distributed in the late Variscan and the late Middle Yanshanian, in which granitic porphyry is the main ore-forming parent rock of copper deposits in this area. The ore-forming process is controlled by .2.69-Cu-Ag ore area, which is located at the intersection of the NW fault zone of the Houliu-Qiujiushan fault zone and the east-west fault zone of the west Liujiushan-QianLiujiushan fault zone. The ore deposit is controlled by the composite structural position of the fault fracture zone of the east west direction of the basement and the volcanic cryptoexplosive breccia zone, and the orebody occurs in the volcanic cryptoexplosive breccia. 3. The wall rock of the mining area is altered strongly. The alteration zone is mainly developed in crypto-explosive breccia and its scale is similar to that of crypto-explosive breccia. The main alteration is silicification sericite mineralization chalcopyrite and pyrite. The geochemical anomaly of Liujiu Cu-Ag deposit is composed of the single element anomaly of six elements of Au-Ag-Ag-Cu-PbPb-Zn-Mo. The anomaly distributes irregularly from north to east, and the anomalous casing is tight, the intensity is high, and the scale is large. When the geochemical anomaly coincides with the anomalous ionization, the geochemical anomaly is in good agreement with the induced electric anomaly. The ore body mainly occurs in cryptoexplosive breccia with irregular veins and lenticular appearance. The ore minerals are mainly pyrite, chalcopyrite, sphalerite, and the ore structure is mainly heteromorphic granular structure and solid solution separation structure, the ore is mainly composed of pyrite, chalcopyrite and sphalerite, and the ore body is mainly composed of pyrite, chalcopyrite and sphalerite. Including structure and vein structure formed by filling, ore structure mainly consists of block structure, disseminated structure and breccia structure .6.According to ore-forming geological conditions, orebody production characteristics, ore-controlling structure, wall rock alteration and so on, It is preliminarily considered that the deposit is of middle and low temperature hydrothermal filling copper silver deposit, and the metallogenic age is the late Yanshanian period.
【学位授予单位】：石家庄经济学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41;P618.52

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