| 大同－阳原盆地南缘断裂带的晚第四纪分段和构造地貌变异 |
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| 引用本文： | 程绍平 杨桂枝. 大同－阳原盆地南缘断裂带的晚第四纪分段和构造地貌变异[J]. 地震地质, 1996, 18(4): 289-300 |
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| 作者姓名： | 程绍平 杨桂枝 |
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| 作者单位： | 国家地震局地质研究所 |
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| 摘 要： | 大同－阳原盆地南缘断裂带是北京西北～山西北部盆－岭区的一条最大的断层。晚第四纪断层崖高度和高度分布型式把断裂带分为西南和东北两个段落。该断裂带在山前带和山麓坡的构造地貌、微地文期演化历史方面存在着明显的分段变异。构造地貌过程的速度和断层习性差异，以及段落边界的重叠断层特征，是构造地貌变异的直接原因
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| 关 键 词： | 活动断裂带 晚更新世 全新世 定量地貌学 断层分段 |
LATE QUATERNARY SEGMENTATION AND SEGMETED VARIATIONS IN TECTONIC GEOMORPHOLOGY OF SOUTHERN MARGINAL FAULT ZONE OF DATONG-YANGYUAN BASIN |
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| Abstract: | The southern marginal fault zone of the Datong-Yangyuan basin is the largest fault in the basin-range area of NW Beijing-N Shanxi.Heights of late Quaternary fault-scarps and their a-long-striking distribution Pattern can divide the fault zone into two segments,the southwest(SW)segment and the northeast(NE)segment.Between these two segments there have been significant variations in mountain front and piedmont slope tectonic geomorphology.as well as in evolutional history of micro-physiographic stages.Individual segments have different quantitative mountain front geomorphobgical indices.Means of mountain front sinuosity(S).valley widthdepth relief ratio(Vf),and stream-gradient index(K)are 1.93,0.49 and 27.18,respectively,for the SW segment,wherea are1.57,0.39 and 56.61,respectively,for the NE segment.The SW segment piedmont slope is characterized by the landform assesbles of youngest alluvial fan A3(Q3+Q4)inerted into older fan A2(Q3),indicating that an upwarping of the near-fault part |
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| Keywords: | Active fault zone Late Pleistocene Holocene Quantitative geomorphology Fault segmentation |
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