洗马林断裂构造几何与变形转换作用

doi:10.3969/j.issn.0253-4967.2018.01.005

地震地质 ›› 2018, Vol. 40 ›› Issue (1): 57-70.DOI: 10.3969/j.issn.0253-4967.2018.01.005

洗马林断裂构造几何与变形转换作用

周月玲¹, 尤惠川², 杨歧焱³

1. 河北省地震局, 石家庄 050022;
2. 中国地震局地球物理研究所, 北京 100081;
3. 河北地质大学, 石家庄 050031

收稿日期:2017-11-14 修回日期:2018-01-24 出版日期:2018-02-20 发布日期:2018-04-13
通讯作者: 尤惠川,男,研究员,E-mail:youhc@126.com
作者简介:周月玲,女,1983年生,2011年于中国地震局地球物理研究所获地球探测与信息技术专业硕士学位,工程师,主要从事地震地质和断层活动性调查与研究,电话:15226586920,E-mail:zyl19831111@sina.com。
基金资助:
河北省地震科技星火计划项目（DZ20170503012，DZ20150423057）与地震科技星火计划项目（XH180302Y）共同资助

GEOMETRY AND DEFORMATION TRANSFORMATION OF THE XIMALIN FAULT

ZHOU Yue-ling¹, YOU Hui-chuan², YANG Qi-yan³

1. Hebei Earthquake Agency, Shijiazhuang 050022, China;
2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
3. Hebei GEO University, Shijiazhuang 050031, China

Received:2017-11-14 Revised:2018-01-24 Online:2018-02-20 Published:2018-04-13

摘要/Abstract

摘要： 洗马林断裂为洗马林-水泉断裂的西北段，是洋河盆地北缘断裂带的组成断裂之一，位于张家口-渤海断裂构造带与山西断陷盆地带的复合部位，其构造几何和变形特征是研究两大构造带相互作用的良好素材。文中采用地质地貌调查和地球物理探测等手段对该断裂进行探查和研究，阐述了断裂的几何展布、构造特征与活动性，分析了其与邻近断裂的构造关系，讨论了其在洋河盆地北缘断裂带中的变形转换作用。研究结果显示：洗马林断裂是1条以走滑为主、兼具逆冲的断裂，晚更新世中晚期以来和全新世期间的垂直滑动速率分别为0.17mm/a和0.25～0.38mm/a，水平滑动速率为0.58～0.67mm/a和0.50mm/a。断裂由NW向的主体断层和NE向的次级断层交替组合形成，NW向断层表现为高角度逆左旋走滑，NE向断层显示出正断活动，2组构造具有特定的构造几何关系，运动方式和变形特征相互匹配；在洋河盆地北缘断裂带的活动过程中，NW向的洗马林断裂起到了类似转换断层的变形转换与应力传递作用，其左旋走滑活动使得两端的NE向正断层活动得以协调进行。

关键词: 洗马林断裂, 变形转换, 构造特征, 活动性

Abstract: The Ximalin fault is the northwest section of the Ximalin-Shuiquan fault, which is part of the north-edge fault zone of the Yanghe Basin, located in the conjunction of the Zhangjiakou-Bohai fault zone and Shanxi fault-depression basin, and its structural geometry and deformation characteristics can facilitate the research on the interaction of the two tectonic belts. In this paper, data of geological surveys and geophysical exploration are used to study this fault exhaustively, concerning its geometry, structural features and activity as well as its relationship with adjacent faults and rule in the deformation transform of the north-edge fault zone of the Yanghe Basin. The results show that the Ximalin Fault is a strike-slip feature with thrust component. Its vertical slip rates are 0.17mm/a and 0.25~0.38mm/a, and the horizontal slip rate is 0.58~0.67mm/a and 0.50mm/a during the late Middle Pleistocene and Holocene, respectively. It is formed alternately by the NW-trending main faults and secondary NE-trending faults, of which the former is characterized by high-angle reverse with sinistral strike-slip, and the latter shows normal faulting. The two sets of structures have specific structural geometry relations, and the motion manners and deformation characteristics match each other. During the active process of the north-edge fault of the Yanghe Basin, the NW trending Ximalin fault played a role similar to a transform fault in deformation change and stress transfer, and its sinistral strike slip activity accommodated the NE trending normal faulting at the both ends.

Key words: Ximalin Fault, deformation transformation, structural feature, activity

中图分类号:

P315.2

周月玲, 尤惠川, 杨歧焱. 洗马林断裂构造几何与变形转换作用[J]. 地震地质, 2018, 40(1): 57-70.

ZHOU Yue-ling, YOU Hui-chuan, YANG Qi-yan. GEOMETRY AND DEFORMATION TRANSFORMATION OF THE XIMALIN FAULT[J]. SEISMOLOGY AND GEOLOGY, 2018, 40(1): 57-70.

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洗马林断裂构造几何与变形转换作用

GEOMETRY AND DEFORMATION TRANSFORMATION OF THE XIMALIN FAULT

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