| 利用夷平面的变形进行断陷地块构造反演——以京西北蔚广盆地南缘断裂带为例 |
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| 引用本文： | 王,林,田勤俭.利用夷平面的变形进行断陷地块构造反演——以京西北蔚广盆地南缘断裂带为例[J].地质科学,2017,0(3):801-817. |
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| 作者姓名： | 王 林 田勤俭 |
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| 作者单位： | 中国地震局地震预测研究所，地震预测重点实验室 北京 100036 |
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| 摘 要： | 当前活动断层研究主要关注单条断层本身，如果将研究尺度拓展到活动地块，则可以整体上更好地理解各断层活动的关联性。利用层状地貌面累积的构造变形来反演活动地块构造运动是一种行之有效的方法。近两年，国产高分卫星产出了海量、高分辨率的影像资料，与此同时GIS 平台与技术也得到了快速的发展，这些都为利用华北山地夷平面反演京西北盆岭构造区内断陷地块的构造运动提供了契机。本文基于国产GF2卫星1 m 全色与4 m 多光谱影像、1∶50 000 数字线划地图，借助ArcGIS 平台，解译出蔚广盆地南缘断裂带上升盘地块
中发育有典型的甸子梁面、唐县面两期夷平面，提取出了能够反映它们构造变形的定量参数，对其构造变形规律进行的分析表明：北东向断裂（F）贯通了蔚广盆地及其西南方的灵丘盆地，相应地将前者的上升盘地块划分为东西两个次级地块，并使得前者的主边界断裂在此
发生应变分解，并将部分应变传递给了灵丘断陷盆地系统。蔚广盆地及其周缘邻区的断陷盆地统一地受到南东-北西向区域引张应力场的作用，相应地形成了以北东向为主的断层形迹。岩性的差异造成了断层F两侧两种不同的断块运动方式，F西侧在太古代变质基底内发生断陷，使得断块整体掀斜，而在F 东侧，燕山期侵入花岗岩体阻碍了断块的整体掀斜，断块通过调整其运动方式，使得掀斜程度从边缘向内部逐渐降低，F 作为调节断层，衔接了其两侧两种不同变形方式。
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| 关 键 词： | 高分卫星数据 GIS 技术 夷平面 甸子梁面 唐县面 掀斜运动 岩性差异 活动地块 |
| 收稿时间： | 2016-05-08 |
| 修稿时间： | 2016-05-08; |
Tectonic evolution of the faulted block indicated by the deformation of the planation surface: Example from the research of the Yuguang Basin south marginal fault in the Northwest Beijing basin-ridge tectonic zone |
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| WangLin Tian Qinjian.Tectonic evolution of the faulted block indicated by the deformation of the planation surface: Example from the research of the Yuguang Basin south marginal fault in the Northwest Beijing basin-ridge tectonic zone[J].Chinese Journal of Geology,2017,0(3):801-817. |
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| Authors: | WangLin Tian Qinjian |
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| Institution: | Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, China Earthquake Administration, Beijing 100036 |
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| Abstract: | Most existing research of active fault mainly focuses on the single fault itself. Fault is often studied isolatedly, ignoring its neighboring tectonics. If the research scale extends to the whole active faulted block, we can better understand every active fault related consisting of the faulted block. The analysis of the tectonic deformation of the layered landform surface is an effective method to study the tectonic evolution. In recent years, the launching of domestic remote sensing satellite has brought about massive data of high resolution image, the software and technology of GIS has also developed rapidly, which provide an opportunity to study the tectonic movement of the active faulted block in the Northwest Beijing basin-ridge tectonic zone through the deformation of the planation surface in the mountainous area in North China. In this paper, based on the 1 m panchromatic image and 4 m multispectral image of the GF2 satellite, the 1∶ 50 000 digital line graphics, by means of ArcGIS, we interpret two typical planation surfaces in the uplifting block of the Yuguang Basin south marginal fault（YBSMF）, including the Dianziliang and the Tangxian planation surface. We extract the quantity factors which can reflect their tectonic deformation, and analysis the characteristics of their tectonic deformation. Finally, we find that an NE fault（F）cuts through the Yuguang Basin and the Lingqiu Basin at its southwest, and cuts the uplifting block of the YBMSF into two secondary blocks: The east and the west. The strain of the YBMSF patitions at fault F, and a portion of the
original strain has transferred to the Lingqiu basin tectonic system through fault F. The Yuguang Basin and a series of similar graben basins nearby are subjected to the SE-NW regional extensional stress field, which caused the formation of the main NE faults in the region. The tectonic movement of the secondary faulted block at the east and the west are different due to the different lithology. At the west, the block faulted in the Archean metamorphic basement causing the whole tilting of the block. While at the east, the Yanshanian intrusive granite hindered the whole tilting of the block, so the block adjusted the way of movement which caused the tilting decreased gradually inward. The fault F accommodated the different tectonic movement of the faulted blocks at its west side and east side. |
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| Keywords: | GF satellite image GIS technology Planation surface Dianziliang surface Tangxian surface Tectonic tilting Lithology difference Active faulted block |
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