江西省志木山铜多金属矿床地质特征与找矿方向探讨

发布时间：2018-05-04 21:24

本文选题：地质背景 + 地质特征　；参考：《东华理工大学》2015年硕士论文

【摘要】：“萍乡市上栗县志木山铜多金属矿区”位于江西省萍乡市北北西的金山镇,该矿床位于江西省中西部。南侧为扬子板块与华厦板块分界断裂—萍乡~广丰深断裂带,北侧为宜丰~景德镇深断裂带与江南隆起带相邻,隶属钦杭结合带。通过对前人资料的系统查阅、野外考察及综合分析,在矿区地质特征、成矿成因、成矿规律及找矿预测等方面提出一些认识与看法,归纳起来有以下几点:1.本矿区位于钦杭结合带东段(江西段)西端,燕山期壳幔物质调整,热流体上升,地壳活化重组,I型中酸性岩浆侵入及期后热液成矿,引发内生金属成矿大爆炸,成矿大地构造环境优越。2.通过矿区地层资料,认为下二叠统栖霞组钙质泥岩夹粉~泥晶灰岩、中二叠统小江边组泥晶灰岩夹炭质泥岩以及茅口组含生物泥晶灰岩夹白云岩等,均为含钙质细碎屑岩或碳酸盐岩,具备岩浆热流交代矿床的围岩条件。矿区以茅口组成为铜多金属矿的直接围岩,是因为茅口组与燕山期志木山花岗闪长斑岩体的直接接触的结果。3.区内滑覆断层(F1)系宜丰~西山断裂的西延部分,其切割深度大、形成早活动时间长,燕山早期可能成为岩浆活动期导岩及岩浆期后导矿通道,受其影响形成的次级断裂、或所导致地层褶皱的层间破碎带为成矿物质的容矿空间。4.矿区分为南、北两个岩体,根据矿化类型的差异,分析可能属同源两次侵入的产物。成矿流体在南部岩体形成以钨、铁为主的矿化,而在北部岩体则形成以铜、钼为主的矿化;因而形成矿区“南钨铁、北铜钼”矿化格局。而F1下盘原地系统的上三叠统安源组中ZK3101孔资料显示,原岩已接受绢云母、红柱石等角岩化热接触蚀变,光谱定量分析结果锌(含黄铁)矿化明显。显然,成矿顺序为:钨铁→铜钼→锌、黄铁矿。5.统计大量地质资料,本矿床平行接触带矿体与脉状充填矿体同存,其地质特征与典型的接触交代矽卡岩型矿床差异明显。其成矿作用兼有矿浆贯入充填和热液交代的双重性,可定义为矿浆贯入—热液接触交代的广义矽卡岩矿床。6.根据区域资料对比及成矿地质条件分析,①矿区应进一步加强对东段北部、以及西部铜、钼矿找矿工作;②矿区ZK813孔在下盘原地系统钻到下二叠统马平组白云岩地层,热源导致全岩大理岩化,寻找F1下盘岩浆岩及其接触带成为新的找矿思路;③在含煤碎屑岩中寻找铁铜多金属矿。
[Abstract]:"Zhimushan Copper polymetallic Mining area, Shangli County, Pingxiang City" is located in Jinshan Town, north and west of Pingxiang City, Jiangxi Province, which is located in central and western Jiangxi Province. In the south, the Yangtze plate and Huaxia plate are separated by the Pingxiang ~ Guangfeng deep fault zone, and the northern side is adjacent to the Jiangnan uplift belt, belonging to the Qinghang combination zone. Based on the systematic reference of previous data, field investigation and comprehensive analysis, this paper puts forward some understandings and opinions on geological characteristics, metallogenic origin, metallogenic regularity and prospecting prediction of the mining area, which can be summed up as follows: 1. The ore area is located at the western end of the eastern segment of Qinghang binding belt (Jiangxi section), where the crust and mantle materials are adjusted in Yanshanian period, the thermal fluid rises, the crust activates and recombines type I intermediate-acid magma invades and the post-epoch hydrothermal mineralization occurs, which results in a large explosion in the metallogenic process of endogenic metals. The ore-forming tectonic environment is superior. Based on the stratigraphic data of the mining area, it is considered that the calcareous mudstones of the Lower Permian Qixia formation intercalated with mudstone, the middle Permian Xiaojiangbian formation mudstone intercalated with carbonaceous mudstone, and the maokou formation containing biological mudstone intercalated with dolomite, etc. They are calcareous fine clastic rocks or carbonate rocks with the surrounding rock conditions of magmatic heat flow metasomatic deposits. Maokou is the direct surrounding rock of copper polymetallic deposit because of the direct contact between Maokou formation and Yanshanian Shimushan granodiorite. The slip fault (F1) is the westward extension of the Yi-Feng-Xishan fault, which has a large cutting depth and a long time of early activity. The early Yanshanian may become a secondary fault influenced by the magmatic activity and the post-magmatic ore conduction channel. Or the interlayer fracture zone resulting in stratigraphic fold is the ore-bearing space of ore-forming material. According to the difference of mineralization types, the ore area may belong to two intrusions of the same origin. The ore-forming fluid forms the mineralization of tungsten and iron in the southern rock mass and copper and molybdenum in the northern rock mass, thus forming the mineralization pattern of "south tungsten iron, north copper molybdenum" in the mining area. However, the ZK3101 pore data of the Upper Triassic Anyuan formation in the in-situ system of the F1 footwall show that the source rocks have accepted the thermal alteration of sericite and andalusite, and the results of spectral quantitative analysis show that the zinc (including Huang Tie) mineralization is obvious. Obviously, the metallogenic order is: tungsten, iron, copper, molybdenum, zinc, pyrite. According to a large number of geological data, the parallel contact zone ore body and the vein filling ore body co-exist, and the geological characteristics are obviously different from the typical contact metasomatism skarn type deposit. The mineralizing process has the duality of slurry penetration filling and hydrothermal metasomatism, which can be defined as the generalized skarn deposit of interpenetration and hydrothermal contact metasomatism. Based on the regional data correlation and the analysis of metallogenic geological conditions, we should further strengthen the ZK813 hole in the northern and western copper and molybdenum ore prospecting areas of the eastern section and the western part of the Jiao 2 ore deposit, and drill into the dolomite strata of the Lower Permian Maping formation in the footwall in situ system. The source of heat leads to the marble formation of the whole rock, so finding the F1 lower magmatic rock and its contact zone is a new idea for prospecting for iron and copper polymetallic deposits in coal-bearing clastic rocks.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2

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