阴山构造带西段呼勒斯太地区前新生代构造变形研究

发布时间：2018-03-25 21:43

本文选题：呼勒斯太地区　切入点：泥盆纪　出处：《中国地质大学(北京)》2017年硕士论文

【摘要】：内蒙古呼勒斯太地区位于华北克拉通北缘阴山陆内造山带西段。研究区不同时代的地层记录了区域上的多期构造变形,在呼勒斯太地区划分出两期主要的构造运动。早期构造变形主要表现为近EW向断裂和渣尔泰群的强烈褶皱变形。研究区东部乌加河以北地区,中元古界渣尔泰群阿古鲁沟组走向总体为近EW向,产状近直立。渣尔泰群发育一系列近EW向延伸、轴面向南或向北倾斜、枢纽近水平的褶皱。研究区西部的义和久以北,渣尔泰群云母石英片岩中发育A型褶皱,可见褶皱的渣尔泰群被下二叠统大红山组砾岩角度不整合覆盖。根据变形地层时代以及综合前人对邻区的研究成果,推断该期变形发生在泥盆纪。可能为受到白乃庙岛弧增生到华北克拉通北缘或者古亚洲洋闭合作用影响的结果。晚期近NE-SW向构造表现为一系列的NE-SW向延伸的逆冲断层,主要包括哈沙图庙断裂、乌兰呼都格断裂以及哈仁格特勒断裂。其中哈沙图庙断裂为上盘中元古界渣尔泰群与二叠纪侵入岩自NW向SE逆冲至中-下侏罗统石拐群之上;哈仁格特勒断裂主要表现为下侏罗统武当沟组自NW向SE逆冲至中侏罗统长汉沟组之上。卷入晚期NW-SE向挤压变形的最新地层为中-下侏罗统石拐群,并且缺失了上侏罗统大青山组,在研究区西北部,下白垩统近水平,未发生褶皱变形。因此,可限定该期变形发生于中-晚侏罗世,这可能与蒙古-鄂霍茨克洋闭合,西伯利亚板块与华北板块的碰撞拼合作用有关。
[Abstract]:The Huluertai area of Inner Mongolia is located in the western section of the Yinshan intracontinental orogenic belt on the northern margin of the North China Craton. The strata of different ages in the study area have recorded the multi-stage tectonic deformation in the region. There are two main tectonic movements in the Huleritan area. The early tectonic deformation was mainly characterized by near EW faults and strong fold deformation of the Jar Tai Group, and the area north of the Wujia River in the eastern part of the study area. The Agurugou formation of the Middle Proterozoic Jar'tai Group is generally near EW direction and nearly erect. A series of near EW extension is developed in the Jar'tai Group, the axis facing south or north, and the near horizontal fold of the junction. The north of Yihejiu in the western part of the study area, A type A fold is developed in the mica quartz schist of the Jar Tai Group. It can be seen that the Jar Tai Group is covered by unconformity of the conglomerate angle of the Lower Permian Dahongshan formation. It is inferred that the deformation occurred in the Devonian. It may be the result of the accretion of Bainaimiao island arc to the northern margin of the North China Craton or the closure of the Paleo-Asian Ocean. The late NE-SW trending tectonics are characterized by a series of NE-SW extensional thrust faults. The main faults include Hashi Tumiao fault, Wu Lan Huduge fault and Harrengetler fault. The Hasha Tumiao fault is the Upper and Middle Proterozoic Jar Tai Group and Permian intrusive rocks thrust from NW to SE to the Middle and Lower Jurassic Shijiao Group. The main features of the Harrengetler fault are that the lower Jurassic Wudanggou formation thrust from NW direction SE to the middle Jurassic Changhangou formation. The latest strata involved in the late NW-SE compression deformation are the Middle and Lower Jurassic Shijiaodou Group. The upper Jurassic Daqingshan formation is missing, and the lower Cretaceous is near horizontal in the northwest of the study area. Therefore, the deformation can be limited to the middle to late Jurassic, which may be closed to the Mongolia-Okhotsk Ocean. The collision and assembly of Siberian plate and North China plate are related.
【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】：2017
【分类号】：P542

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