湖南省崇阳坪地区钨矿典型矿床特征及成矿规律

发布时间：2018-03-15 18:36

本文选题：崇阳坪　切入点：整装勘查　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：崇阳坪地区位于扬子地块与华南裂陷槽的过渡地带江南地块东南缘,经历了雪峰、加里东、印支、燕山和喜山等五次大的地壳运动,区内地层、构造发育,岩浆活动强烈,为本区钨、锡、铜多金属矿的形成提供了十分有利的区域地质条件。近年来,为提高找矿成效,进行实施了整装勘查项目(崇阳坪地区钨矿整装勘查)。本次论文工作,在充分收集前人资料的基础上,重点对崇阳坪地区的钨矿开展了地质调查和样品分析,对区内钨矿找矿取得了以下认识:1、通过本次工作,在工作区印支期花岗岩内外接触带附近均发现了矿化较好的钨矿体,矿床规模从小型-中到大型,充分证明了该区钨矿成矿条件有利,也说明湘南地区钨矿不仅在燕山期花岗岩内具有形成中-大型矿床的潜力,在印支期花岗岩内同样具有寻找中-大型钨矿床的潜力。2、通过研究发现该区围岩蚀变存在一定的分带性:脉侧蚀变水平方向(从脉依次向外)与垂直方向(从上到下)显示出较一致的变化,即脉→云英岩→硅化→钾长石化→正常花岗岩。通过分析,初步认为花岗岩初期为高酸富碱的,随着温度、压力等变化,依次经历钾长石化、硅化、云英岩化等蚀变,在这些蚀变过程中,成矿流体逐渐由碱性过渡向酸性环境,导致含钨络合物分解,最终沉淀成矿。3、通过本次工作,发现该区钨矿化类型众多,分别有石英大脉型黑钨、白钨矿、石英细脉带型白钨矿、矽卡岩化角岩型白钨矿、矽卡岩型白钨矿、蚀变花岗岩型白钨矿、云英岩型白钨矿、花岗伟晶岩型白钨矿等,其中石英细脉带型白钨矿为区内最主要的矿床类型。通过对比分析,认为中华山岩体内,栗山坡钨矿和沙溪钨矿深部和外围具寻找石英细脉带型白钨矿和矽卡岩化角岩型白钨矿的潜力,崇阳坪和瓦屋塘岩体具有寻找石英细脉带型白钨矿的潜力。分析认为三个岩体中以中华山和崇阳坪岩体及外围找矿潜力较大,应作为下一步整装勘查区的重点主攻方向。4、在了解崇阳坪地区钨矿床成矿地质背景和矿床地质特征的基础上,通过对崇阳坪地区钨矿成矿地质条件及成矿作用的分析,对比不同岩体各个矿床特点,结合研究区不同矿化类型及矿化富集规律,初步建立了找矿模型,为下步找矿评价、成矿预测及勘查工作提供方向及依据,并认为本区具备形成中、大型钨矿的条件,外围及深部还具较大找矿潜力。
[Abstract]:The Chongyangping area is located in the southeastern margin of the Jiangnan block in the transitional zone between the Yangtze block and the South China rift trough. It has undergone five major crustal movements, such as Xuefeng, Caledonian, Indosinian, Yanshanian and Himalayan, with stratigraphic, structural development and strong magmatic activity in the area. It provides a favorable regional geological condition for the formation of tungsten, tin and copper polymetallic deposits in this area. In recent years, in order to improve the prospecting effect, the project of integrated exploration has been carried out. Based on the full collection of previous data, the geological investigation and sample analysis of tungsten deposits in Chongyangping area have been carried out, and the following understanding of tungsten ore prospecting in this area has been obtained, and through this work, The mineralized tungsten ore bodies were found in the vicinity of the Indosinian granite contact zone in the working area. The scale of the deposits ranges from small to medium to large, which fully proves that the metallogenic conditions of tungsten deposits in this area are favorable. It also shows that tungsten deposits in southern Hunan have the potential to form meso-large-scale deposits not only in Yanshanian granites, but also in Yanshanian granites. The Indosinian granites also have the potential to look for medium-large tungsten deposits. Through the study, it is found that there is a certain zonation of the wall rock alteration in this area: the horizontal direction of vein side alteration (from the vein to the outward direction) and the vertical direction (from the top up). To the bottom) showing a more consistent change, Namely pulse. 鈫扱uartz rock. 鈫扴ilicification. 鈫扨otassium petrifaction. 鈫扤ormal granite. Through analysis, it is preliminarily considered that the initial stage of the granite is acid-rich and alkali-rich, and with the change of temperature and pressure, it goes through the alteration of potassium feldspar, silicification, and quartz in turn, in the process of these alteration, The ore-forming fluid gradually transitioned from alkaline to acidic environment, resulting in the decomposition of tungsten complex, and finally precipitated mineralization .3.Through this work, it was found that there are many types of tungsten mineralization in this area, which are quartz large-vein black tungsten and scheelite, respectively. Quartz vein-belt type scheelite, skarn hornstone type scheelite, skarn type scheelite, altered granite type scheelite, dolomite type scheelite, granitic pegmatite type wolframite, etc., The quartz veinlet type scheelite deposit is the most important deposit type in this area. The deep and outer parts of the Li-shan and Shaxi tungsten deposits have the potential to look for quartz vein-belt type scheelite and skarn hornstone scheelite. The Chongyangping and Wawutang pluton bodies have the potential to search for quartz vein-type scheelite deposits. It is considered that the Zhonghua Mountain and Chongyangping intrusions and their periphery have great prospecting potential. It should be regarded as the next major direction of attack in the integrated exploration area. On the basis of understanding the metallogenic geological background and geological characteristics of tungsten deposits in Chongyangping area, the metallogenic geological conditions and metallogenic processes of tungsten deposits in Chongyangping area are analyzed. By comparing the characteristics of various ore deposits in different rock masses, combining with different mineralization types and mineralization enrichment laws in the study area, a preliminary prospecting model is established, which provides the direction and basis for the next prospecting evaluation, metallogenic prediction and exploration work. It is considered that this area has the conditions for forming medium and large tungsten deposits and the potential for prospecting in the periphery and in the deep.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.67

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