中国地质调查2019，Vol.6Issue(2)：58-67,10.DOI:10.19388/j.zgdzdc.2019.02.07
山西隆起区燕山期构造变形特征
Structure deformation characteristics of Shanxi uplift area during Yanshan movement period
摘要
Abstract
During Yanshann movement period, the contractive structure deformation of the thrust fault and buckling folds formed as the basic structural elements is shown in Shanxi uplift area. Strata of different ages in this area have unique rock assemblage and physical properties, which may preserve and record deformation styles and characteristics at different levels of Yanshan structure. Through the study of surface geology, physiognomy and structure characteristics, we primarily concluded the "delaminate contractive deformation, and vertical stacking and thickening" structure mode. The balanced section method was applied to quantitatively estimate the horizontal shortening and vertical thickening effect, which were caused by nearly E-W shrinkage deformation. The section restoration showed that, before and after deformation, the horizontal shortening of the uplift area was about 32.8％ in total. Cambrian bottom unconformity interface in the uplift area is about 5 km higher than that in Ordos Basin, due to vertical thickening. The intensive collision uplift and folding deformation resulted in the lateral shortening and vertical thickening in the upper part of the crust. Geological bodies are orderly vertically stacked and different levels of tectonic trace have shown great changes in spatial positions. Current spatial distribution of surface geological bodies, differences between northern and southern fold combination style and the along-the-trend segmentation of fracture all demonstrate the vertical stratification of tectonic deformation, due to late uplift and the difference of denudation degree on the surface.关键词
燕山运动/构造模式/平衡剖面/山西隆起区Key words
Yanshan movement/structural model/balanced section/Shanxi uplift area分类
天文与地球科学引用本文复制引用
刘康,魏荣珠,续世朝..山西隆起区燕山期构造变形特征[J].中国地质调查,2019,6(2):58-67,10.基金项目
中国地质科学院地质研究所"山西区域地质调查片区总结与服务产品开发(编号:121201102000150012-05)"项目资助 （编号:121201102000150012-05）
