吕梁隆起中段冲断构造解析  

Analysis of thrust tectonics of the middle segment of the Lüliang Uplift

作　　者：石婧 Shi Jing(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083)

机构地区：[1]中国地质大学(北京)能源学院,北京100083

出　　处：《地质科学》2023年第1期248-258,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国石油长庆油田公司科技攻关项目“鄂尔多斯盆地中元古界—奥陶系构造沉积演化、成源机制与勘探新领域”(编号:ZDZX2021-01);国家自然科学基金企业创新发展联合基金项目“海相深层油气富集机理与关键工程技术基础研究”(编号:U19B6003)资助。

摘　　要：吕梁隆起是认识华北克拉通的重要窗口,对于克拉通的形成、保存与演化具有重要参考意义。目前对于吕梁隆起的构造样式及其演化特征的研究仍然偏弱。本文对吕梁隆起中段核部吴城镇白马仙洞一带的构造进行解析,通过野外地质调查,建立了东西向构造地质剖面,应用2D-Move、FaultFold软件对剖面进行反演与正演模拟,分析其构造样式与构造演化特点。研究认为:吕梁隆起核部在燕山期受到强烈的东西向挤压作用而发生隆升,早期在基底发育区域性滑脱面,滑脱面之上发育了两条逆断层(F1、F2),上覆地层形成断层传播褶皱,基底发生滑脱卷入,此时处于快速隆升阶段;燕山期中期F1、F2逆断层持续活动,断层端点向上破裂至石炭系,此时处于慢速隆升阶段;燕山期晚期断层F1、F2持续向上突破所有地层,倾角达70°,东侧新产生一新的断层F3,上覆地层以及基底太古界花岗岩形成断层转折褶皱,进入快速隆升阶段;其后风化剥蚀最终形成现今构造格局。该区地层总缩短量为3.17 km,总缩短率为13.4%。本文为之后研究吕梁隆起的陆内构造变形及其矿产资源提供了参考依据。The Lüliang Uplift is an important window for understanding the North China Craton, and has important reference to the formation, preservation and evolution of the craton. At present, the research on the structural style and evolution characteristics of Lüliang Uplift is still undergoing.This paper analyzes the structure of Baimaxiandong area, Wucheng Town, the core of the middle section of Lüliang Uplift. Through field geological survey, an east-west structural geological profile is established. The 2D-Move and FaultFold softwares are used respectively for inversion and forward structural modeling of the profile to analyze its structural style and structural evolution characteristics. It shows that the core of Lüliang Uplift was uplifted due to strong east-west-trending compression in Yanshanian. In the early stage, a regional detachment surface was developed on the basement, and two reverse faults(F1 and F2)were developed above the detachment surface. The overlying strata formed fault propagation folds, and the detachment in the basement was involved in the deformation. At this period, it was in a rapid uplift stage;In the middle of Yanshanian, F1and F2 reverse faults continued to move, and the fault tip broke up to the Carboniferous, which was in a slow uplifting stage. The Late Yanshanian saw faults F1 and F2 continued to break through all strata upwardly, with a dip angle of 70°. A new fault F3 was generated in the east, and the overlying strata and Archean granite on the basement formed a fault-bend fold, entering a rapid uplifting stage.Later, weathering and denudation finally formed the current tectonic framework. The total shortening of the profile is 3.17 km, with a total shortening rate of 13.4%. It provides a reference to the study of the intra-continental tectonic deformation and mineral resources exploration in Lüliang Uplift.

关 键 词：华北克拉通 吕梁隆起 构造演化 断层相关褶皱 陆内变形 

分 类 号：P542[天文地球—构造地质学]