山西中条山断裂带的晚第四纪分段模型  

LATE QUATERNARY SEGMENTATION MODEL OF THE ZHONGTIAOSHAN FAULT, SHANXI PROVINCE

作　　者：程绍平[1] 杨桂枝[1] 

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《地震地质》2002年第3期289-302,共14页Seismology and Geology

基　　金：国家基础研究发展规划项目 (G19980 4 0 70 1)资助

摘　　要：山西南部的中条山断裂是鄂尔多斯断块周边活动断裂系东南部分的 1条断裂。有关断层活动性的最新研究结果表明 ,中条山断裂的活动性水平较低且重复间隔较长。在这个认识的基础上 ,根据构造不连续性、构造地貌学、探槽古地震学和断层运动学证据 ,进一步提出了晚第四纪中条山断裂的分段模型及其定量参数。The Zhongtiaoshan Fault, southern Shanxi is an active fault in the southeastern part of the active fault system around Ordos Massif, being the boundary between the Yuncheng Faulted basin and the Zhongtiaoshan Faulted Mountain. The recent study about fault activity indicates that it has a lower level of activity and a relatively long recurrence interval of faulting. On the basis of this understanding, a further study is carried out on the segmentation of the Zhongtiaoshan Fault, while the late Quaternary segmentation model and its quantitative parameters are provided in the light of evidence from tectonic discontinuity, tectonic geomorphology, trench paleoseismology, and fault kinematics. The Zhongtiaoshan Fault runs from the northern piedmont to the western piedmont of the Zhongtiaoshan Mountains, with a length of 137km, a general strike of NE-NEE, and a dip angle of 58°～75°, being a high angle normal fault. On one hand, the northern piedmont part of the fault exhibits a big curve convex southeast; and on the other hand, the western piedmont part of the fault intersects with its northern piedmont part at an angle of 120°. By these two major tectonic discontinuities, the Zhongtiaoshan Fault can be divided into three geometric segments from northeast to southwest: the Xiaxian segment, the Xiezhou segment, and the Hanyang segment. The major tectonic discontinuities persistently control the Cenozoic sedimentation in the Yuncheng Faulted Basin. The Xiezhou segment of the Yuncheng Faulted Basin was the depocenter not only of Tertiary system but also of Quaternary system. Morphometric analysis has indicated that the elevation profile of divides and geomorphic characteristics of drainage system in the Zhongtiaoshan Mountains, such as length and gradient index of stream, as well as evolution of its mountain front, have apparent segmented variations, showing an along strike tectonic inhomogeneity caused by long term faulting. The quantitative parameters, such as long term slip rate,

关 键 词：分段模型 晚第四纪 中条山断裂 山西 地震 构造地貌学 

分 类 号：P315.2[天文地球—地震学]