第31卷第1期 2017年2月
现代地质 GEOSCIENCE
色尔腾山山前断裂大后店一瓦窑滩段的
地貌特征与分段
龙建宇，何仲太，张浩，马保起
（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）
Vol. 31No.1 Feb.2017
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一瓦窑滩段进行地貌调查和测量，认为该段并不是一条向NE方向突出的单一强形断裂，而是由走向为EW向的红旗村段(大后店一乌不浪口)和走向为NW向的圈留补隆段(乌不浪口一瓦密滩)组成。整条断裂共发育4级台地，T，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；T，的形成时代在距今2万至3万年以前。而全新世T，台地在该两段上的分布并不相同，红旗村段和围图补隆段T，台地的平均高度分别为5.37m 和8.1m，测得的台地年龄分别为6.23ka和12.36ka，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 0.86mm/a和0.65mm/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。
关键词：色尔腾山；地貌；台地；断层陡坎；断裂分段
中图分类号：P315.2；P642
文献标志码：A
文章编号：10008527(2017)01007110
CharacteristicsofStructuralGeomorphologyandSegmentation ofSertengshanPiedmontFaultfromDahoudiantoWayaotan
LONG Jianyu, HE Zhongtai, ZHANG Hao, MA Baoqi
(Key Laboratory of Crustal Dynamies, Institute of Crustal Dynamics, CEA, Bejing 100085, China)
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 investi-gation 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 Hongqi cun segment （Dahoudian-Wubulangkou）and the southeast-trending Kuluebulong segment （Wubulangkou-Wayaotan). There are four terraces along the fault. The age of T, terrace is 50 -70 ka in which lacustrine de-posits are from Hetao lake.The age of T, terrace is 20 30 ka. The terrace scale and landscape between Hongqicun segment and Kuluebulong segment are different. The average height of the Holocene T, terrace is 5. 37 m in the Hongqicun segment and 8. 1 m in Kuluebulong segment. The ages of them are respectively 6. 23 ka and 12. 36 ka. T, terrace in the two segments is composed by fluvial deposits., The average vertical slip rate is 0. 86 mm/a and 0. 65 mm/a, respectively. The characteristics of geometrical distribution, structural land-scape, 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.
收稿日期：2016-03-24；改回日期：2016-11-24；责任编辑：潘令枝。
务费专项（ZDJ2016-11）。
作者简介：龙建宇，男，硕士研究生，1989年出生，构造地质学专业，主要从事地貌和活动构造运动研究。
Email; long-jianyu@ 163. com。
通信作者：何仲太，男，博士，高级工程师，1982年出生，构造地质学专业，主要从事活动构造研究工作。
Email; hezhongtai@ 126. com