本文關鍵詞： 地質(zhì)構造 運動學 動力學 構造成因模式 韓城礦區(qū)　出處：《西安科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：煤炭工業(yè)作為能源和基礎產(chǎn)業(yè),支持和保障著陜西省國民經(jīng)濟和社會的發(fā)展。處于“渭北黑腰帶”東部的韓城礦區(qū)開采歷史悠久,是陜西省重要的煤炭生產(chǎn)基地,為陜西省甚至全國的經(jīng)濟發(fā)展做出了巨大貢獻。但韓城礦區(qū)地質(zhì)構造十分復雜,成為制約礦區(qū)煤炭安全高效開采的重要地質(zhì)因素。開展對韓城礦區(qū)地質(zhì)構造的運動學和動力學研究,揭示地質(zhì)構造的成因機制,有助于全面深入地認識韓城礦區(qū)地質(zhì)構造的發(fā)育展布規(guī)律,為礦區(qū)安全高效開采提供地質(zhì)依據(jù)。同時,也是對煤田構造及構造控煤研究的進一步深化,具有一定的理論意義和實用參考價值。通過本文研究工作,取得了以下主要結(jié)論。(1)分別采用沉降史分析法和平衡剖面法,計算了礦區(qū)的升降運動量、收縮和伸展運動量。計算結(jié)果表明,晚石炭世～中三疊世礦區(qū)地層累計沉降量1300m以上,晚三疊世～中新世不均勻抬升量600m以上;印支期南北向擠壓收縮率為1.4%,燕山期由SE向NW擠壓收縮率達11.52%,喜山期由NW向SE拉張伸展率2.7%以上。揭示了 SN向擠壓收縮率南大北小;NW向收縮率東大西小;NW向收縮率大于SN向收縮率的運動學特征。(2)韓城礦區(qū)在印支期受到近南北向的擠壓應力,擠壓應力具有“南強北弱”的特點;燕山期受到自SE向NW的擠壓應力,具有“東強西弱”特點,且在北區(qū)平面剪應力集中;喜山期區(qū)域構造應力場由擠壓轉(zhuǎn)變?yōu)槔瓘?向SE方向的拉張伸展作用一直持續(xù)到現(xiàn)代,且在繼續(xù)向北西方向發(fā)展。(3)韓城礦區(qū)在印支期形成近東西向褶皺和逆斷層以及由NE向和NW向剪裂面構成的共軛剪節(jié)理系,構造變形具有“南強北弱”特點;燕山期形成礦區(qū)構造的基本格局,表現(xiàn)為NE向褶皺和逆斷層、近東西向與近南北向剪裂面構成的共軛剪節(jié)理系,構造變形具有“東強西弱”的規(guī)律,且在北區(qū)發(fā)育更多層滑構造和構造煤;喜山期區(qū)內(nèi)普遍發(fā)育以正斷層及其組合為代表的伸展構造,表現(xiàn)出“東強西弱”和“南強北弱”的規(guī)律。三期構造相互限制、疊加和改造,使得礦區(qū)地質(zhì)構造錯綜復雜。
[Abstract]:The coal industry, as an energy and basic industry, supports and guarantees the development of the national economy and society in Shaanxi Province. Hancheng mining area in the east of Weibei Black Belt has a long history of mining. It is an important coal production base in Shaanxi Province, which has made great contribution to the economic development of Shaanxi Province and even the whole country. However, the geological structure of Hancheng mining area is very complex. It has become an important geological factor restricting the safe and efficient mining of coal in mining area. The kinematics and dynamics of geological structure in Hancheng mining area are studied to reveal the formation mechanism of geological structure. It is helpful to fully and deeply understand the development and distribution of geological structure in Hancheng mining area, and provide geological basis for safe and efficient mining in the mining area. At the same time, it is also a further deepening of the study on coal field structure and structural coal control. It has certain theoretical significance and practical reference value. Through the research work of this paper, the following main conclusions are obtained: 1) the subsidence history analysis method and the balanced section method are used to calculate the ascending and descending movement quantity of the mining area respectively. The results show that the accumulative subsidence of late Carboniferous ~ Miocene mining area is more than 1300m, and the uneven uplift amount of late Triassic ~ Miocene is more than 600m. During the Indosinian period, the compression contraction rate was 1.4% in the South-North direction, and 11.52% in the Yanshanian period from SE to NW. The extensional rate of NW to SE is more than 2.7% in the Himalayan period, which reveals that the compression shrinkage in SN direction is small in the north and south. The contraction rate of NW is large and small in the east and west. The kinematic characteristics of NW direction shrinkage ratio is larger than SN direction shrinkage ratio. (2) the Hancheng mining area is subjected to the extrusion stress in the Indosinian period, and the extrusion stress has the characteristics of "the south is strong and the north is weak". The Yanshanian period is subjected to compression stress from SE to NW, which is characterized by "east strong and weak west", and is concentrated in plane shear stress in the northern region. During the Himalayan period, the tectonic stress field changed from compression to extension, and the extensional extension to SE direction lasted until the modern times. In the Hancheng mining area, nearly east-west fold and reverse faults and conjugate shear joints composed of NE and NW shear face were formed in the Indosinian period. The tectonic deformation is characterized by "the south is strong and the north is weak". The basic structure pattern of Yanshanian mining area is characterized by NE-trending fold and reverse fault, conjugate shear joint system of near east-west direction and near south-north direction shear fracture surface. The tectonic deformation has the law of "east strong west weak". Moreover, more layer slip structures and tectonic coals are developed in the northern region. Extensional structures, represented by normal faults and their assemblages, are generally developed in the Himalayan area, showing the law of "east strong strong west weak" and "south strong strong north weak". The third stage structures restrict each other, superimpose and reconstruct each other. The geological structure of the mining area is complicated.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.11;P548

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