太行山北段紫荆关断裂带构造特征与活动期次

发布时间：2018-10-09 10:33

【摘要】：太行山构造岩浆带由于矿产丰富、构造复杂、地理位置优越等因素,长期以来都是地质研究的热点地区。宏观上走向北北东、倾向南东的紫荆关断裂带就是太行山地区的主要构造之一,其对周边岩体与矿床的控制、岩浆与成矿物质来源、以及中生代华北构造格局的形成机制都具有重要的指示意义。因此,本文在充分收集和总结前人研究成果、资料的基础上,以野外构造现象为基础,以断裂构造研究为主线,对紫荆关断裂带的构造特征进行了系统的研究。通过大量调查和室内分析,探讨了断裂带的几何学、运动学和动力学特征,提出紫荆关断裂带具有以下特征:(1)紫荆关断裂带总体走向为北北东方向,倾向南东,北陡南缓。(2)紫荆关断裂带经历了三次不同强度的构造活动:前二次为较强的挤压活动;第三次的张性断裂活动,相对前两次较弱。(3)由于紫荆关断裂带在平面上整体分布不连续,断裂各段之间呈左阶斜列分布,故紫荆关断裂带在平面上具有分段性。(4)紫荆关断裂带在切过不同力学性质的地层时展现出了分带性。(5)紫荆关断裂带经历了三次不同性质的构造活动:早期:晚侏罗世的近南北方向的强烈挤压,中期:晚侏罗世到早白垩世受到北西南东向挤压应力形成密集节理带和花岗岩的左行逆冲断层;晚期:晚白垩世的北西、南东向拉张兼右行走滑。
[Abstract]:The Taihang tectonic magma belt has long been a hot area in geological research due to its rich mineral resources, complicated structure and superior geographical location. The Zijingguan fault zone, with a macroscopic strike north to the north and a tendency to the south, is one of the main structures in the Taihang Mountain area, which controls the surrounding rock masses and deposits, and the source of magma and ore-forming materials. The formation mechanism of the Mesozoic North China tectonic framework is of great significance. Therefore, on the basis of collecting and summarizing the previous research results and data, based on the field structural phenomena and the main line of fault structure research, the structural characteristics of the Zijingguan fault zone are systematically studied in this paper. Based on a large number of investigations and laboratory analysis, this paper discusses the geometric, kinematic and dynamic characteristics of the fault zone, and points out that the Zijingguan fault zone has the following characteristics: (1) the overall trend of the fault zone is north to east and inclines south to east. (2) the Zijingguan fault zone experienced three tectonic activities of different strength: the first two were strong compressive activity, the third extensional fault activity was weaker than the previous two. (3) because of the discontinuous distribution of the Zijingguan fault zone on the plane, The faults are distributed in a left-order oblique sequence. Therefore, the Zijingguan fault zone is segmented on the plane. (4) the Zijingguan fault zone shows zonation when cutting through the strata with different mechanical properties. (5) the Zijingguan fault zone experienced three tectonic activities of different properties: early period: late pygmy. The strong compression of Ros near the north and south, The middle period: late Jurassic to early Cretaceous due to the compression stress of NNW direction formed dense joint zone and left thrust fault of granite, late stage: late Cretaceous NW, S E trending extension and right strike slip.
【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】：P542

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