| 色尔腾山山前断裂大后店—瓦窑滩段的地貌特征与分段 |
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| 引用本文： | 龙建宇,何仲太,张浩,马保起.色尔腾山山前断裂大后店—瓦窑滩段的地貌特征与分段[J].现代地质,2017,31(1):71. |
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| 作者姓名： | 龙建宇 何仲太 张浩 马保起 |
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| 作者单位： | 中国地震局地壳应力研究所地壳动力学重点实验室，北京100085 |
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| 基金项目： | 中国地震局项目“色尔腾山山前断裂1∶5万活动断层填图”（201408023）；中国地震局地壳应力研究所基本科研业务费专项（ZDJ2016-11）。 |
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| 摘 要： | 色尔腾山山前断裂位于阴山山脉的中西段，控制着临河凹陷的北缘，在晚第四纪以来有着强烈的活动。通过对色尔腾山山前断裂大后店—瓦窑滩段进行地貌调查和测量，认为该段并不是一条向NE方向突出的单一弧形断裂，而是由走向为EW向的红旗村段(大后店—乌不浪口)和走向为NW向的圐圙补隆段(乌不浪口—瓦窑滩)组成。整条断裂共发育4级台地，T3台地的形成时代在距今5万至7万年以前，是河套古大湖的湖滨相沉积；T2的形成时代在距今2万至3万年以前。而全新世T1台地在该两段上的分布并不相同，红旗村段和圐圙补隆段T1台地的平均高度分别为537 m和81 m，测得的台地年龄分别为623 ka和1236 ka，沉积物均为冲洪积砂砾。两段断裂全新世的滑动速率分别为086 mm/a和065 mm/a。这两段在几何展布、构造地貌、断层运动学性质方面有不同的特征，属于不同的活动断裂分段，其分段边界的类型为断裂交汇处的T型结点。
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| 关 键 词： | 色尔腾山 地貌 台地 断层陡坎 断裂分段 |
Characteristics of Structural Geomorphology and Segmentation of Sertengshan Piedmont Fault from Dahoudian to Wayaotan |
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| LONG Jianyu,HE Zhongtai,ZHANG Hao,MA Baoqi.Characteristics of Structural Geomorphology and Segmentation of Sertengshan Piedmont Fault from Dahoudian to Wayaotan[J].Geoscience——Journal of Graduate School,China University of Geosciences,2017,31(1):71. |
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| Authors: | LONG Jianyu HE Zhongtai ZHANG Hao MA Baoqi |
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| Institution: | Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, CEA, Beijing100085, China |
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| Abstract: | Sertengshan piedmont fault is located in the middle west segment of Yingshan Mountain, controlling the north boundary of Linhe basin with a strong movement since the Late Quaternary. Based on the field investigation and measurements of Sertengshan piedmont fault from Dahoudian to Wayaotan, it is revealed the segment is not a single arcual fault in the NE direction but two secondary segments which are the east trending Hongqicun segment (Dahoudian Wubulangkou) and the southeast trending Kuluebulong segment (Wubulangkou Wayaotan). There are four terraces along the fault. The age of T3 terrace is 50-70 ka in which lacustrine deposits are from Hetao lake. The age of T2 terrace is 20-30 ka. The terrace scale and landscape between Hongqicun segment and Kuluebulong segment are different. The average height of the Holocene T1 terrace is 537 m in the Hongqicun segment and 81 m in Kuluebulong segment. The ages of them are respectively 623 ka and 1236 ka. T1 terrace in the two segments is composed by fluvial deposits. The average vertical slip rate is 086 mm/a and 065 mm/a, respectively. The characteristics of geometrical distribution, structural landscape, kinematics of the fault are completely different. So the two segments are independent from each other. There is a T shaped junction between the two segments. |
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| Keywords: | Sertengshan landscape terrace fault scarp fault segmentation |
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