辽西建昌南部喇嘛洞、王家店地区中生代构造变形与古应力场研究
发布时间：2018-09-14 18:26
【摘要】：辽西建昌南部喇嘛洞、王家店一带位于燕山板内造山带东段近WE向右行走滑构造系统与辽西NE-NNE向逆冲构造和伸展构造系统的汇聚区域。中生代以来受到古亚洲洋构造域以及古太平洋构造域共同作用影响,在本区形成了复杂的构造形迹。前人工作已经对这些构造形迹的几何形态以及运动学性质有所认识,但是它们的形成时代、相互关系、变形期次及其与区域构造系统之间的联系,尚未得到很好揭示。本文通过对研究区褶皱-断裂构造开展几何学、运动学性质研究,并结合关键地质体同位素测年与断层滑动矢量应力反演结果,初步厘定了本区中生代构造变形以及古应力场演化的4个期次:(1)早侏罗世之前(~191.6Ma)近NS向挤压应力场下形成了近EW向正向逆冲构造。(2)晚侏罗世土城子组-早白垩世义县组阶段为(141.7~126Ma)NW-SE向挤压应力场,控制近EW向右行走滑系统的形成,同时也主导了本区中生代基本构造格局的形成。(3)早白垩世九佛堂组沉积阶段(126~119Ma)为NW-SE到NNW-SSE向伸展应力场,控制本区NNE向伸展断裂系统的形成。(4)早白垩世九佛堂组沉积之后-晚白垩世阶段(119~66Ma)经历了NE-SW向挤压应力场作用,控制了本区NW-NNW向褶皱-断裂构造系统的形成,对早期构造产生部分叠加、改造作用,但改造并不强烈,并未改变原有构造格局。不同阶段构造变形对应了不同的区域构造背景。近NS向挤压应力场主要受到了古亚洲洋闭合之后的持续作用控制;近EW向右行走滑系统受到了古亚洲洋构造系统与古太平洋构造系统的联合作用;NNE向伸展断裂系统与NW-NNW向褶皱-断裂系统则主要与太平洋板块向欧亚大陆俯冲作用有关。
[Abstract]:The Lama Cave and Wangjiadian area in the south of Jianchang, western Liaoning Province, are located in the convergence area of the WE-right strike-slip tectonic system and NE-NNE-trending thrusting and extensional tectonic system in the eastern Yanshan intraplate orogenic belt. Traces. Previous work has known about the geometry and kinematics of these structural traces, but their formation ages, interrelationship, deformation stages and their relationship with the regional tectonic system have not been well revealed. Four stages of Mesozoic tectonic deformation and paleo-stress field evolution in this area are preliminarily determined according to isotope dating of key geological bodies and inversion results of fault slip vector stress: (1) Near EW-trending forward thrust structures were formed under near NS-trending compressive stress field before Early Jurassic (~191.6 Ma). (2) Tuchengzi Formation of Late Jurassic-Yixian Formation of Early Cretaceous. The stage is (141.7-126 Ma) NW-SE compressive stress field, which controls the formation of near EW-right strike-slip system and also dominates the formation of Mesozoic basic tectonic framework. (3) The early Cretaceous Jiufotang Formation sedimentary stage (126-119 Ma) is NW-SE to NNW-SSE extensional stress field, which controls the formation of NNE-trending extensional fault system in this area. (4) Early Cretaceous. After sedimentation of the Jiufotang Formation, the Late Cretaceous (119-66Ma) underwent NE-SW compressive stress field, which controlled the formation of NW-NNW Fold-Fault tectonic system in this area. The early structure was partly superimposed and reformed, but the reformation was not strong and did not change the original tectonic framework. TECTONIC BACKGROUND: Near NS-trending compressive stress field is mainly controlled by the sustained action after the closure of the Paleo-Asian Ocean; near EW-trending dextral strike-slip system is affected by the combination of the Paleo-Asian Ocean tectonic system and the Paleo-Pacific tectonic system; NNE-trending extensional fault system and NW-NNW-trending Fold-Fault system are mainly subducted from the Pacific plate to the Eurasian continent Impact is 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】：2015
【分类号】：P542
本文编号：2243513
[Abstract]:The Lama Cave and Wangjiadian area in the south of Jianchang, western Liaoning Province, are located in the convergence area of the WE-right strike-slip tectonic system and NE-NNE-trending thrusting and extensional tectonic system in the eastern Yanshan intraplate orogenic belt. Traces. Previous work has known about the geometry and kinematics of these structural traces, but their formation ages, interrelationship, deformation stages and their relationship with the regional tectonic system have not been well revealed. Four stages of Mesozoic tectonic deformation and paleo-stress field evolution in this area are preliminarily determined according to isotope dating of key geological bodies and inversion results of fault slip vector stress: (1) Near EW-trending forward thrust structures were formed under near NS-trending compressive stress field before Early Jurassic (~191.6 Ma). (2) Tuchengzi Formation of Late Jurassic-Yixian Formation of Early Cretaceous. The stage is (141.7-126 Ma) NW-SE compressive stress field, which controls the formation of near EW-right strike-slip system and also dominates the formation of Mesozoic basic tectonic framework. (3) The early Cretaceous Jiufotang Formation sedimentary stage (126-119 Ma) is NW-SE to NNW-SSE extensional stress field, which controls the formation of NNE-trending extensional fault system in this area. (4) Early Cretaceous. After sedimentation of the Jiufotang Formation, the Late Cretaceous (119-66Ma) underwent NE-SW compressive stress field, which controlled the formation of NW-NNW Fold-Fault tectonic system in this area. The early structure was partly superimposed and reformed, but the reformation was not strong and did not change the original tectonic framework. TECTONIC BACKGROUND: Near NS-trending compressive stress field is mainly controlled by the sustained action after the closure of the Paleo-Asian Ocean; near EW-trending dextral strike-slip system is affected by the combination of the Paleo-Asian Ocean tectonic system and the Paleo-Pacific tectonic system; NNE-trending extensional fault system and NW-NNW-trending Fold-Fault system are mainly subducted from the Pacific plate to the Eurasian continent Impact is 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】：2015
【分类号】：P542
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