發(fā)布時間：2019-05-09 16:39

【摘要】：獅子山礦田是目前安徽銅陵礦集區(qū)銅金儲量最大的礦田,礦田受以北北東向構(gòu)造為主導,以北東向、南北向、東西向構(gòu)造為基礎(chǔ)的多重構(gòu)造的復合疊加,使得整個礦田內(nèi)的礦床呈“蒸籠式”分布。本文運用礦田構(gòu)造的基礎(chǔ)理論和方法,以詳實的野外地質(zhì)調(diào)查和室內(nèi)總結(jié)研究為基礎(chǔ),系統(tǒng)介紹了銅陵礦集區(qū)區(qū)域及獅子山礦田的成礦地質(zhì)特征,探討了礦田內(nèi)礦床的分布特征、構(gòu)造應力場演化期次及構(gòu)造控礦規(guī)律,并結(jié)合地層和巖漿巖特征總結(jié)了礦田成礦規(guī)律。研究認為獅子山礦田內(nèi)的眾多礦床具有典型的分布特征,深部為賦存于石英閃長巖體中的斑巖型礦床和層控矽卡巖型礦床,如冬瓜山深部斑巖型銅礦和上部層控矽卡巖型銅礦;中部為花樹坡、老鴉嶺、大團山、西獅子山等層間矽卡巖型礦床和胡村矽卡巖型礦床,淺部為東獅子山隱爆角礫巖型礦床和雞冠山矽卡巖型疊加中溫熱液型及風化-淋濾型礦床。北北東向構(gòu)造為礦田的主導性構(gòu)造,與北東向、南北向、東西向構(gòu)造分級序控巖、控礦,且決定了礦田內(nèi)巖體、礦體空間分布的基本格局;獅子山礦田經(jīng)歷了多期構(gòu)造應力場作用,形成的主要構(gòu)造形跡為印支期北東向褶皺變形、燕山早期東西向褶皺變形及燕山期北北東向扭轉(zhuǎn)、斷裂構(gòu)造變形;斷裂構(gòu)造是成礦流體的運移通道,為部分脈狀礦體的沉淀提供了空間;順層滑脫構(gòu)造不僅是礦液運移通道,也是最重要的儲礦構(gòu)造。燕山期中酸性巖漿活動、巖性層位和構(gòu)造疊加是形成礦床的重要地質(zhì)條件,礦床的最終形成是在燕山期統(tǒng)一的巖漿-流體-成礦系統(tǒng)中形成的,尤其在不同方向的構(gòu)造復合并有巖體的出露的位置極易形成礦床,并以刺山金礦為例進行了找礦預測。
[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.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P613

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