| 山西隆起区燕山期构造变形特征 |
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| 作者姓名： | 刘康 魏荣珠 续世朝 |
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| 作者单位： | 1.山西省地质调查院,太原 030006; 2.山西省地质博物馆,太原 030024 |
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| 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 |
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| 摘 要： | 山西隆起区燕山运动期间表现出以逆冲断层、纵弯褶皱为基本结构要素的收缩构造变形特征。区内不同时代地层具有独特的岩石组合和物理性质,保存和记录了燕山期构造在不同层次的变形样式和特征。通过对地表地质、地貌及构造特征的研究分析,初步总结出“分层收缩变形,垂向叠置增厚”的构造模式。应用平衡剖面法对近东西向收缩变形所造成的水平缩短与垂向加厚效应进行了定量估算,剖面复原表明,变形前、后隆起区总体水平缩短率约为 32.8%,垂向加厚使寒武系底部不整合界面在隆起区比鄂尔多斯盆地高出约5 km。强烈的冲断抬升和褶皱变形造成上部地壳横向缩短,垂向增厚,使原本垂向上有序叠置的地质体和不同层次构造形迹在空间位置上发生了较大变化。现在地表地质体的空间分布、北部和南部褶皱组合样式的差异,以及断裂沿走向的分段性,都是构造变形垂向分层性的表现形式,是后期隆升、剥蚀程度差异在地表造成的结果。
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| 关 键 词： | 燕山运动 构造模式 平衡剖面 山西隆起区 |
| 收稿时间： | 2018-12-28 |
Structure deformation characteristics of Shanxi uplift area during Yanshan movement period |
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| Authors: | LIU Kang WEI Rongzhu XU Shichao |
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| Institution: | 1. Shanxi Institute of Geological Survey, Taiyuan 030006, China; 2. Shanxi Geology Museum, Taiyuan 030024, China |
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| 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. |
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| Keywords: | Yanshan movement structural model balanced section Shanxi uplift area |
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