北京昌平—怀柔一带中生代叠加构造变形及其演化过程

发布时间：2018-02-06 08:01

本文关键词： 昌平-怀柔地区中生代叠加变形　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：北京昌平-怀柔一带位于燕山造山带西段,区内发育强烈的构造变形和广泛的岩浆活动,前人对中生代时期NE向构造形迹研究较多,对其它方向的构造形迹关注较少,而对它们之间的叠加改造关系的研究更显不足,因此导致对该区中生代构造演化过程的认识存在欠缺。本研究通过野外观测和室内分析,厘定了研究区内不同方向收缩构造变形的几何学和运动学特征,结合不同构造形迹之间的交切关系,及其与相关岩体、火山岩地层之间的侵入和覆盖关系,以及基于断层滑动数据的古应力状态反演,对各类构造变形进行了分期配套,并分析了它们相互叠加和改造的演化过程。NW向收缩构造变形主要表现为一系列宽缓的褶皱,如铁矿峪背斜和黄岩山背斜,卷入褶皱的最新地层为奥陶系,髫髻山组火山岩(161-153 Ma)不整合覆盖其上,该期收缩构造变形时限在161 Ma之前,后期被NE向逆冲断层和岩体改造,平面图上的NW向褶皱轴迹和露头上NW向小型褶皱的枢纽发生弯曲变形。NE向收缩构造变形最为强烈,并可分为两期,早期主要发育NE向褶皱,如黄花城背斜和上庄西南侧NE向背向斜,发育在长城系、蓟县系、寒武系和奥陶系中,叠加在NW向褶皱之上;后期主要发育NE向逆冲断层及其上下盘伴生褶皱,如十三陵-上庄-红螺寺逆冲断层和大片-铁矿峪逆冲断层,逆冲方向总体指向NW,局部指向NNW,逆冲断层使早期形成的NE向褶皱的局部形态变的紧闭,十三陵-上庄-红螺寺逆冲断层被薛家石梁岩体(130 Ma)截切,NE向收缩构造变形时限在130 Ma之前。NNW向收缩构造,主要表现为若干褶皱,如百合村东侧的褶皱和军都山背斜,该期褶皱发育在雾迷山组和髫髻山组地层中,百合村褶皱具有指向SWW的运动学极性,NNW向的褶皱叠加在NE向的十三陵-上庄-红螺寺逆冲断层和薛家石梁岩体之上,该期收缩构造变形时限为130Ma之后。本次研究根据野外观测到的各期构造变形的叠加关系和区域资料厘定了研究区中生代各期构造变形的时限。研究区NW向褶皱构造变形可能与蒙古-鄂霍茨克板块的俯冲碰撞相关,NNW向收缩构造的运动学极性指示该期变形的动力来自研究区东侧。
[Abstract]:Beijing Changping - Huairou area is located in the Yanshan orogenic belt, tectonic zone developed strong deformation and extensive magmatism, the predecessor to the Mesozoic era to the structural features of NE, on the other direction of the structural features of less attention, and the study on the superimposed relationship between them more insufficient, thus leading to the existence of a lack of understanding the process of Mesozoic tectonic evolution in this area. Through the analysis of the field observation and indoor, determining the geometry and kinematics characteristics of the study area in different direction of contraction of tectonic deformation, combination between different structural relationships of rock mass and rock strata, between volcano intrusive and covering relations, as well as based on fault slip data the stress state of inversion, the tectonic deformation of staging facilities, and analyzes the evolution of.NW and their mutual superposition and transformation to shrink structure Deformation is mainly a series of broad and gentle fold, such as iron ore and Huangyan Valley anticline anticline, the new strata is involved in Ordovician, volcano rock group in Jishan (161-153 Ma) unconformity on the deformation time at 161 Ma before the period of tectonic contraction, the latter being NE to thrust fault and rock transformation plan NW to fold axis and NW to the small outcrop on the folds of the hub bending deformation.NE to shrink deformation most strongly, and can be divided into two periods, the early development of NE mainly to the fold, such as the Huanghuacheng anticline and the southwest side of the NE cable to support the village, development in the Great Wall, Jixian County, Cambrian and Ordovician, superimposed on the NW trending folds; later developed mainly NE trending thrust faults and footwall associated fold, such as the Ming Dynasty Tombs, Hongluo Temple - - thrust faults and large iron ore - Valley thrust fault, thrust direction of the overall direction NW, pointing to the local NN W, thrust fault in the early formed NE closed to the local form of fold change, Ming Dynasty Tombs - Hongluo Temple shangzhuan thrust by xuejiashiliang rock (130 Ma) cut, NE to contractional deformation to structural contraction duration of.NNW before 130 Ma, mainly for several fold, such as lily of the eastern side of the village and in the mountain fold anticline, the folds are developed in the Wumishan formation and Tiaojishan Formation in Lily village fold with kinematics to the SWW polarity, NNW to the fold in the direction of NE - Ming Dynasty Tombs - Hongluo Temple, thrust fault and xuejiashiliang rock, after the period of contraction deformation time is 130Ma. In this study, according to the different tectonic deformation field observed superimposed relationship and regional data have been identified in the study area the Mesozoic tectonic deformation time. The study area NW to fold deformation may be related to the Mongolia Okhotsk subduction The kinematic polarity of the NNW to the contractile structure indicates that the dynamic force of this period of deformation comes from the east of the research area.

【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

【参考文献】