广东省东源县上礤钨矿成矿地质件分析及成矿预测

发布时间：2018-03-23 08:52

本文选题：钨矿　切入点：成矿地质特征　出处：《东华理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：研究区位于国家级重点成矿带武夷成矿带南段,紫金-惠阳凹褶断束的北西边缘部位,北东向河源深断裂带的北东侧,位于莲花山新华夏构造带的西北侧,期间经历了印支期、燕山期等构造运动,地区褶皱、断裂构造发育,岩浆活动强烈,其中燕山期侵入岩和火山岩广泛分布;区内断裂形成于印支运动,主要为人字石断裂,是广东三级构造单元的分界线。论文主要通过大量野外地质调查工作,在收集相关资料和岩石地球化学分析的基础上,对东源县上礤钨矿的控矿地质条件、矿床地质特征、控矿因素等方面进行了大量野外地质调查和研究,取得了如下认识:(1)根据矿床地质特征,发现东源县上礤钨矿矿化类型主要为石英脉型,矿化主要集中在石英脉充填的断裂和裂隙中;蚀变主要以硅化、黄铁矿化、绢云母化和钾长石化、铅锌矿化,其次可见云英岩化、褐铁矿化、绿泥石化等,矿化蚀变带中常伴有W、Mo元素等成矿元素,这些矿化蚀变可以作为钨矿找矿标志;(2)地层与成矿关系密切,主要表现为为成矿提供部分物质来源和影响矿液的流动方向;褶皱构造有利的成矿部位主要是背斜倾伏端及翼部,向斜扬起端,主要矿体富集区域在接触界面由陡变缓的下凹部位,控矿断裂构造主要有F1断裂和人字石断裂,断裂主要被硅质石英脉充填交代,成矿规模较大,为矿液的充填交代提供有利空间;矿区岩浆岩主要为黑云母花岗岩,为钨矿成矿提供丰富的物质来源;(3)通过对东源县上礤钨矿围岩岩石地球化学分析,通过主量元素、稀土元素分析,判明了近矿花岗岩属于过铝质高钾钙碱性类型,其花岗岩属于造山后花岗岩(POG),其构造环境是一种拉伸环境;稀土元素具轻稀土富集,Eu负异常的特征;(4)依据地层、构造、岩浆岩联合控矿的特点,对该区划分出了三个成矿远景区:矿区东部为一级远景区,中西部为二级远景区,南东部为三级远景区。
[Abstract]:The study area is located in the southern segment of Wuyi metallogenic belt, Zijin-Huiyang fold fold belt, in the north west edge of Zijin-Huiyang fold fold belt, in the north east side of Heyuan deep fault zone, and in the west and north side of the Lianhuashan New Huaxia structural belt, and has experienced the Indosinian period. Yanshanian tectonic movement, regional fold, faulted structure, strong magmatic activity, in which Yanshanian intrusive rocks and volcanic rocks were widely distributed, the faults in this area were formed in Indosinian movement, mainly composed of herringite faults, It is the dividing line of the third-order tectonic unit in Guangdong Province. Based on the collection of relevant data and petrogeochemical analysis, the paper mainly through a large number of field geological survey work, the ore controlling geological conditions and deposit geological characteristics of Shangcai tungsten deposit in Dongyuan County, China. A large number of field geological investigations and studies on ore-controlling factors have been carried out, and the following understandings have been obtained: (1) according to the geological characteristics of the deposit, it is found that the type of mineralization of the Carr tungsten deposits in Dongyuan County is mainly quartz vein type. The mineralization is mainly concentrated in the faults and fissures filled with quartz veins, and the alteration is mainly silicification, pyrite, sericite and potassium feldspar mineralization, lead-zinc mineralization, followed by quartz rock mineralization, limonite mineralization, green mud fossilization, etc. The ore-forming elements such as Wimo are often associated in the mineralization alteration zone, which can be used as the ore-prospecting marker of tungsten ore. The ore-forming strata are closely related to the mineralization, which mainly shows that the mineralization provides some material sources and affects the flow direction of the ore solution. The favorable ore-forming positions of fold structure are mainly anticline volt and wing, and syncline uplift. The main orebody enrichment area is in the concave where the contact interface changes from steep to slow, and the ore-controlling faults are mainly F1 fault and herringbone fault. The fault is mainly filled with siliceous quartz vein, and the ore-forming scale is large, which provides favorable space for filling and metasomatism of ore fluid, and magmatic rocks in mining area are mainly biotite granites. By analyzing the rock geochemistry of the surrounding rock of the Shangcai tungsten deposit in Dongyuan County, and by the analysis of the principal elements and rare earth elements, it is concluded that the granites near the ore deposit belong to the peraluminous high potassium calc-alkaline type. The granites belong to post orogenic granitoids, and their tectonic environment is an extensional environment, and rare earth elements are characterized by negative anomalies of EU and EU enriched by light rare earth elements.) according to the characteristics of strata, tectonics and magmatic rocks, they control ore deposits jointly. There are three metallogenic scenic spots in this area: the east of the mining area is the first class, the central and western part is the second class, and the eastern part of the south is the third class.
【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】：P618.67

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