会理县秀水河钒钛磁铁矿床地质特征及成矿规律研究

发布时间：2018-01-15 10:41

本文关键词：会理县秀水河钒钛磁铁矿床地质特征及成矿规律研究　出处：《西南科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：秀水河钒钛磁铁矿床位于红格矿田南东段,通过对区域地质、矿区地质、矿床地质及矿石特征进行了叙述,重点研究了岩(矿)体韵律特征,初步总结成矿规律。得到了以下几点认识:秀水河含矿岩体属弱碱—碱质、贫钙—亚钙、低铝质的铁质、铁镁质基性—超基性岩,与红格岩体极其相似;其在成岩期与红格岩体属同一大岩体,后期构造破坏和岩浆裹切分割使其与母体分离,形成现在相对独立的基性—超基性岩体。秀水河岩体的形成时代稍早于峨眉山玄武岩,但二者均属晚二叠世产物,可能是岩浆演化中同源异相的产物。成矿物质来源应该是幔源富含Fe、Ti的玄武岩浆。岩体的每个含矿层从底部到顶部,矿石结构呈现出粒状镶嵌结构—海绵陨铁结构—嵌晶结构—填隙结构的总体趋势,构造总体为致密块状—浸染状的趋势,二者体现出一定的相关性;矿物成分上,铁钛氧化物、磁黄铁矿及橄榄石含量逐渐减少,而黄铁矿及长石、辉石则逐渐增多;矿石化学成分与结构构造、矿物成分及含量之间存在一致的韵律性变化特征;而且钒钛磁铁矿体主要富集在每个含矿层的中下部。致密块状、稠密浸染状矿石中铁钛氧化物比脉石矿物先结晶,而稀疏、星散浸染状矿石中硅酸盐矿物先结晶,因此不能将矿床简单的划为早期或晚期岩浆矿床。秀水河钒钛磁铁矿由岩浆多旋回、多期次脉动侵入形成,既存在深源分异,又存在就地结晶分异,应属多成因复成矿床。攀西地区含钒钛磁铁矿的基性—超基性岩体与峨眉山玄武岩、碱性岩构成“三位一体”,三者共生是找矿的一个重要方向,另外需重视韵律特征良好的辉长岩—辉石岩—橄辉岩组合及碳酸盐出露地区,配合物化探手段,开展找矿工作。
[Abstract]:Xiushuihe vanadium titanomagnetite deposit is located in the south section of Hongge ore field. Through the description of regional geology, mining area geology, deposit geology and ore characteristics, the rhythmic characteristics of rock (ore) body are studied emphatically. This paper summarizes the metallogenic law and obtains the following conclusions: Xiushuihe ore-bearing rock body is weak alkali-alkali, poor in calcium and calcium, low in aluminous iron, ferromagnesis-ultrabasic rock, very similar to Hongge rock body; It belongs to the same large rock mass as the Hongge rock during diagenetic period, and is separated from the parent body by late structural failure and magmatic shearing segmentation. The Xiushuihe pluton was formed earlier than the Emeishan basalt, but both of them were the product of the late Permian. It may be the product of homologous facies in magmatic evolution. The source of the ore-forming material should be the basaltic magma which is rich in Fe and Ti in the mantle. Each ore-bearing bed of the rock body is from the bottom to the top. The ore structure shows the general trend of granular mosaic structure, spongy meteorite structure, embedded crystal structure and interstitial structure. In mineral composition, the contents of iron and titanium oxide, pyrrhotite and olivine decrease gradually, while pyrite and feldspar and pyroxene increase gradually. There is a consistent rhythmic variation between the chemical composition and structure, mineral composition and content of the ore. Moreover, the vanadium titanomagnetite is mainly concentrated in the middle and lower part of each ore-bearing layer. The silicate minerals in the dispersed disseminated ore are crystallized first, so it is not easy to classify the deposit as an early or late magmatic deposit. Xiushuihe vanadium titanomagnetite is formed by magmatic polycycle and multi-period pulsation. There is not only deep source differentiation, but also local crystallization differentiation. The basic-ultrabasic rock body of vanadium bearing titanomagnetite and the Emeishan basalt in Panxi area are composed of "trinity". Their symbiosis is an important direction of ore prospecting. In addition, attention should be paid to the diabase, pyroxenite-olivine assemblage with good rhythmic characteristics and carbonate outcrop areas, and to carry out the prospecting work by means of geochemical exploration of complexes.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P612

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