Abstract

The Kazerun fault system as an active transverse fault has affected the structures and sedimentation of the Zagros belt from Cambrian to the present. On the basis of published geological maps this fault system has divided into four segments: the Sisakht, Yasuj, Kamarij and Borazjan segments. The fault slip data in the seven sites close the Kamarij segment within this fault system; we have studied using the Direct Inversion and Right Dihedra methods. The results demonstrate that the reverse faulting and the strike-slip faulting on this fault system. This suggested that the discrepant stress axes direction on this fault system is that it takes up shortening perpendicular to the strike of the Zagros by a component of extension parallel to the strike of the belt, rather than by crustal thickening. In addition to analysis of the stress axes, fault-slip data were analyzed using the graphical kinematic method. The purpose of this analysis was to test the homogeneity of the data sets and to determine the geometric relationships that are represented by kinematic axes. Analysis indicates remarkably homogeneous kinematic axes as defined by the near-horizontal NE–SW shortening and near-horizontal NW–SE extension. In fact, the Kazerun fault system accommodates some of the shortening between Arabia and Central Iran by an elongation of the Zagros belt parallel to strike. It is not easy to assess the likely rate of elongation parallel to the strike of the Zagros. It is clear from the anticlines and reverse faulting earthquakes near the Kazerun fault system that it does not accommodate all the shortening at its position within the belt. These observations combined with the regional elevations and historical seismicity suggests to us that the rate of motion on the Kazerun fault system is relatively slow.

中文翻译：

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伊朗Zagros褶皱冲断带内Kazerum断层系统的运动学评估

摘要

Kazerun断裂系统作为活跃的横向断裂影响了从寒武纪到现在的Zagros带的结构和沉积。根据已公布的地质图，该断层系统分为四个部分：Sisakht，Yasuj，Kamarij和Borazjan段。七个站点中的断层滑动数据关闭了该断层系统中的Kamarij段。我们使用直接反演和Right Dihedra方法进行了研究。结果表明，该故障系统存在逆向断裂和走滑断裂。这表明该断层系统上应力轴方向的差异在于，它沿垂直于Zagros走向的方向是通过平行于皮带走向的延伸分量而不是地壳增厚而缩短。除了分析应力轴外，使用图形运动学方法分析了断层滑动数据。该分析的目的是测试数据集的同质性，并确定由运动轴表示的几何关系。分析表明，由近水平NE-SW缩短和近水平NW-SE扩展定义的运动轴非常均一。实际上，Kazerun断层系统通过平行于走向的Zagros带的延伸而适应了阿拉伯和伊朗中部之间的一些缩短。评估与Zagros触头平行的可能的伸长率并不容易。从Kazerun断层系统附近的背斜和逆断层地震中可以明显看出，它不能适应带内所有缩短点。