山西五台地区系舟山逆冲推覆构造地质特征  

Geological and Structural Features of Jizhoushan Thrust Nappe in Wutaishan Area, Shanxi Province

作　　者：孙占亮[1] 续世朝[1] 李建荣[1] 刘成如 高建平[1] 杨耀华[1] 闫文胜[1] 张玉生[1] 

机构地区：[1]山西省地质调查院,山西榆次030600

出　　处：《地质调查与研究》2004年第1期28-34,共7页Geological Survey and Research

基　　金：中国地质调查局国土资源大调查项目 (2 0 0 0 1 3 0 0 0 0 40 51 )

摘　　要：系舟山逆冲推覆构造带位于中生代燕山造山带的西南端,分布于系舟山掀斜向斜的北西翼,形成于晚侏罗世晚期,空间上由一系列近平行排列的逆冲断裂组成,剖面上表现为侧幕展布的犁式逆冲断裂所构成的前陡、后缓的单冲式叠瓦状构造。主体由北西向南东方向逆冲,逆冲扩展方式为前展式,运移距离大于5.8km。推覆构造中应力状态在横、纵向上呈现有规律的变化,根带以挤压为主的高角度逆冲断裂及复杂多级褶皱为主;中带以单剪为主,形成叠瓦状构造;锋带挤压作用增强,发育反冲断层和不对称褶皱。随着挤压应力的松弛减弱,山前形成规模较大的正断层。Jizhoushan thrust nappe belt is located in the southwestern part of the Mesozoic Yanshan orogenic zone. The thrust nappe belt lies on the northwestern limb of the Jizhoushan syncline with a NEˉstriking axial and occurs during the late period of the late Jurassic. It is composed of a series of nearly parallel thrust faults like plough shape in across section, forming an imbricate arrangement with steep in the front and gentle in the back. The thrust direction of the nappes is mainly southeastward and the slipping distance is more than 5.8 km. The stress during the thrust changed regularly both in horizontal and longitudinal direction. In the basic belt, the main structure is made of highˉangle thrust faults and complex multilevel folds with compression stress. In the middle belt, the stress turned into shearing, and formed imbricate structure. And the recoil fault formed with the compression increasing in the peak belt. Later, the bigger scale normal fault appeared in the foreland with the compression decreasing.

关 键 词：逆冲推覆构造 燕山造山带 叠瓦状构造 前展式 正断层 

分 类 号：P542[天文地球—构造地质学] .3[天文地球—地质学]