韩城矿区地质构造的几何学解析

发布时间：2018-06-25 19:02

本文选题：地质构造 + 发育规律　；参考：《西安科技大学》2017年硕士论文

【摘要】：韩城矿区地质构造复杂,地质构造对矿井安全生产的影响日益突出。因此,查清矿区地质构造的展布规律对煤炭开采具有重要意义。本文以几何学构造解析法为主要研究方法,全面分析了矿区地质构造的展布规律,取得了以下主要结论及成果:(1)矿区总体构造格局是倒转背斜的残留翼,表现为一走向NE,倾向NW,被次级褶皱与断裂构造复杂化的单斜构造。断裂构造与褶皱构造均较发育,但在空间上差异明显,总体具有“东西分带,南北分块;浅部复杂,深部简单”的特点。断裂构造与褶皱构造表现为“东强西弱、南强北弱”的特点;从断裂构造的发育形式看,南区以切层断层为主,北区以层滑构造为主,呈“南断北滑”的特点。(2)矿区普遍发育区域性剪节理,NW向与NE向的剪节理构成早期共轭剪节理系,近东西向与近南北向的剪节理构成晚期共轭剪节理系,其中,近东西向和近南北向的剪节理最为发育。同时,区内剪节理的发育方向与小断层密集带的展布方向较为一致。(3)矿区层滑构造及与其密切相关的构造煤广泛发育,且具有明显的分区性。北区多发育褶皱型层滑构造,构造煤分布广、级别高;南区多发育断裂型层滑构造,构造煤分布范围相对较小、以原生结构煤和低级别构造煤为主。(4)褶皱构造的组合型式以平行式为典型代表。断层在平面上的组合型式以平行式、“入”字型、雁列式为主;在剖面上以阶梯式、地垒式、地堑式为主,且叠瓦式组合型式仅在矿区边浅部发育。(5)矿区地质构造形成于三个时期:印支期形成近东西向的纵弯褶皱、逆断层及NE、NW向的剪裂面;燕山期形成NE向的纵弯褶皱、逆断层及近东西、近南北向的剪裂面;喜山期形成大量正断层。三期构造相互限制、叠加和改造,使得矿区地质构造错综复杂。(6)依据矿区地质构造“东强西弱、南强北弱、南断北滑”的发育特点,将矿区在东西向划分为3个一级,南北向划分为4个二级和4个三级构造单元。
[Abstract]:The geological structure of Hancheng mining area is complex, and the influence of geological structure on mine safety production is increasingly prominent. Therefore, it is important for coal mining to find out the distribution of geological structure in mining area. In this paper, the distribution law of geological structure in mining area is analyzed comprehensively, and the main conclusions and results are as follows: (1) the overall tectonic pattern of mining area is the residual wing of inverted anticline. It is a monoclinal structure with a strike NE-trending to NW and complicated by secondary fold and fault structure. The fault structure and fold structure are developed, but there are obvious differences in space. They have the characteristics of "east-west zonation, north-south partitioning, shallow complexity and deep simplicity". The fault structure and fold structure are characterized by "the east is strong and the west is weak, the south is strong and the north is weak". (2) the early conjugate shear joints formed by the regional shear joints in NW and NE directions, and the shear joints in the near east-west direction and the near south-north direction constitute the late conjugate shear joints system. The shear joints near the east-west direction and the near-south-north direction are the most developed. At the same time, the development direction of shear joints in the area is consistent with the distribution direction of the small fault dense zone. (3) the strata slip structure and the closely related tectonic coal in the mining area are widely developed and have obvious zoning. There are many fold type stratigraphic slip structures in the north region with wide distribution and high grade of tectonic coal, while in the southern region there are many faulted types of layer-slip structures, and the distribution range of tectonic coal is relatively small. The primary structure coal and low grade structural coal are the main ones. (4) the combination type of fold structure is represented by parallel type. The combined types of faults in the plane are parallel, "entering" and geese, and in the section they are mainly of step type, crustal type and graben type. Moreover, the imbricate assemblage is only developed in the shallow part of the ore area. (5) the geological structure of the ore area was formed in three periods: the Indosinian formation of the nearly east-west bended fold, the reverse fault and the NENW shear face, and the Yanshanian formation of the NE longitudinal bend fold. Reverse faults and near east-west shear face near the north-south direction; a large number of normal faults were formed in the Himalayan epoch. Because of the mutual limitation, superposition and transformation of the third-stage structure, the geological structure of the mining area is complicated. (6) according to the developmental characteristics of the geological structure of the mining area, "the east is strong and the west is weak, the south is strong and the north is weak, and the south fault is north to north", the mining area is divided into three levels in the east-west direction. The south-north direction is divided into 4 secondary and 4 tertiary tectonic units.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.11

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