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  本文選題：鎢礦　切入點：成礦地質特征　出處：《東華理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：研究區(qū)位于國家級重點成礦帶武夷成礦帶南段,紫金-惠陽凹褶斷束的北西邊緣部位,北東向河源深斷裂帶的北東側,位于蓮花山新華夏構造帶的西北側,期間經歷了印支期、燕山期等構造運動,地區(qū)褶皺、斷裂構造發(fā)育,巖漿活動強烈,其中燕山期侵入巖和火山巖廣泛分布;區(qū)內斷裂形成于印支運動,主要為人字石斷裂,是廣東三級構造單元的分界線。論文主要通過大量野外地質調查工作,在收集相關資料和巖石地球化學分析的基礎上,對東源縣上礤鎢礦的控礦地質條件、礦床地質特征、控礦因素等方面進行了大量野外地質調查和研究,取得了如下認識:(1)根據礦床地質特征,發(fā)現(xiàn)東源縣上礤鎢礦礦化類型主要為石英脈型,礦化主要集中在石英脈充填的斷裂和裂隙中;蝕變主要以硅化、黃鐵礦化、絹云母化和鉀長石化、鉛鋅礦化,其次可見云英巖化、褐鐵礦化、綠泥石化等,礦化蝕變帶中常伴有W、Mo元素等成礦元素,這些礦化蝕變可以作為鎢礦找礦標志;(2)地層與成礦關系密切,主要表現(xiàn)為為成礦提供部分物質來源和影響礦液的流動方向;褶皺構造有利的成礦部位主要是背斜傾伏端及翼部,向斜揚起端,主要礦體富集區(qū)域在接觸界面由陡變緩的下凹部位,控礦斷裂構造主要有F1斷裂和人字石斷裂,斷裂主要被硅質石英脈充填交代,成礦規(guī)模較大,為礦液的充填交代提供有利空間;礦區(qū)巖漿巖主要為黑云母花崗巖,為鎢礦成礦提供豐富的物質來源;(3)通過對東源縣上礤鎢礦圍巖巖石地球化學分析,通過主量元素、稀土元素分析,判明了近礦花崗巖屬于過鋁質高鉀鈣堿性類型,其花崗巖屬于造山后花崗巖(POG),其構造環(huán)境是一種拉伸環(huán)境;稀土元素具輕稀土富集,Eu負異常的特征;(4)依據地層、構造、巖漿巖聯(lián)合控礦的特點,對該區(qū)劃分出了三個成礦遠景區(qū):礦區(qū)東部為一級遠景區(qū),中西部為二級遠景區(qū),南東部為三級遠景區(qū)。
[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.
【學位授予單位】：東華理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.67

【參考文獻】

相關期刊論文 前1條

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本文編號：1652760