安徽铜陵狮子山矿田构造解析和找矿预测

发布时间：2019-05-09 16:39

【摘要】：狮子山矿田是目前安徽铜陵矿集区铜金储量最大的矿田,矿田受以北北东向构造为主导,以北东向、南北向、东西向构造为基础的多重构造的复合叠加,使得整个矿田内的矿床呈“蒸笼式”分布。本文运用矿田构造的基础理论和方法,以详实的野外地质调查和室内总结研究为基础,系统介绍了铜陵矿集区区域及狮子山矿田的成矿地质特征,探讨了矿田内矿床的分布特征、构造应力场演化期次及构造控矿规律,并结合地层和岩浆岩特征总结了矿田成矿规律。研究认为狮子山矿田内的众多矿床具有典型的分布特征,深部为赋存于石英闪长岩体中的斑岩型矿床和层控矽卡岩型矿床,如冬瓜山深部斑岩型铜矿和上部层控矽卡岩型铜矿;中部为花树坡、老鸦岭、大团山、西狮子山等层间矽卡岩型矿床和胡村矽卡岩型矿床,浅部为东狮子山隐爆角砾岩型矿床和鸡冠山矽卡岩型叠加中温热液型及风化-淋滤型矿床。北北东向构造为矿田的主导性构造,与北东向、南北向、东西向构造分级序控岩、控矿,且决定了矿田内岩体、矿体空间分布的基本格局;狮子山矿田经历了多期构造应力场作用,形成的主要构造形迹为印支期北东向褶皱变形、燕山早期东西向褶皱变形及燕山期北北东向扭转、断裂构造变形;断裂构造是成矿流体的运移通道,为部分脉状矿体的沉淀提供了空间;顺层滑脱构造不仅是矿液运移通道,也是最重要的储矿构造。燕山期中酸性岩浆活动、岩性层位和构造叠加是形成矿床的重要地质条件,矿床的最终形成是在燕山期统一的岩浆-流体-成矿系统中形成的,尤其在不同方向的构造复合并有岩体的出露的位置极易形成矿床,并以刺山金矿为例进行了找矿预测。
[Abstract]:Shizishan Orefield is the largest copper and gold reserve in Tongling Mine concentration area, Anhui Province. the ore field is dominated by the north-east-east structure, which is based on the north-east direction, the south-north direction and the east-west direction. So that the deposit in the whole ore field is "steaming cage" distribution. Based on the detailed field geological investigation and laboratory summary research, this paper systematically introduces the metallogenic geological characteristics of Tongling ore concentration area and Shizishan ore field by using the basic theory and method of ore field structure, and on the basis of detailed field geological investigation and laboratory summary research. In this paper, the distribution characteristics of ore deposits in the ore field, the evolution period of the tectonic stress field and the ore-controlling regularity of the structure are discussed, and the ore-forming regularity of the ore field is summarized in combination with the characteristics of strata and magmatic rocks. It is considered that many deposits in Shizishan Orefield have typical distribution characteristics. In the deep part, there are porphyry deposits and stratabound skarn deposits existing in quartz diorite, such as Dongguashan deep porphyry copper deposit and upper layered skarn copper deposit. In the central part are interlayer skarn deposits such as Huashupo, Lao Yaling, Datunshan, Xishizishan and Hucun skarn deposits. The shallow part is composed of the eastern Shizishan cryptoexplosive breccia deposit and the Jiguanshan skarn superimposed mesothermal hydrothermal type and weathering-leaching type deposit. The NE-trending structure is the dominant structure of the ore field, and it is the basic pattern of the spatial distribution of the rock mass and orebody in the ore field, which is classified and controlled by the NE-NE, NE-NE and W-E-trending structures. Shizishan Orefield has experienced multi-stage tectonic stress field. The main tectonic features are NE-trending fold deformation in Indosinian period, EW-trending fold deformation in early Yanshanian period, NE-trending torsion in Yanshan period and fault tectonic deformation. The fault structure is the migration channel of ore-forming fluid, which provides space for the precipitation of some vein-like orebodies, and the bedding slip structure is not only the migration channel of ore fluid, but also the most important ore-storing structure. The Yanshanian intermediate-acid magmatic activity, lithologic horizon and tectonic superimposition are the important geological conditions for the formation of the deposit, and the final formation of the deposit was formed in the unified magmatic-fluid-metallogenic system of the Yanshanian period. Especially, it is easy to form ore deposits in the positions of structural compound and exposed rock mass in different directions, and the ore prospecting prediction is carried out by taking the Shishan gold deposit as an example.
【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】：P613

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