Journal of Structural Geology ( IF 3.1 ) Pub Date : 2021-05-07 , DOI: 10.1016/j.jsg.2021.104352 Yasamin Ebrahimi , Shahram Shafieibafti , Reza Derakhshani , Sara Esmaeilian
Inclined transpression can be defined in terms of simultaneous contraction and strike-slip and dip-slip shearing. An example of an upper-crustal inclined transpression zone is exposed at Bazargan area, SE Iran. As with most natural transpression zones, deformation at Bazargan area is heterogeneous, and widespread kinematic strain partitioning has given rise to an irregular distribution of strain components and resulting structures. Based on structural and strati graphical evidence, deformational events are divided into two stages: (1) a Late Triassic event and (2) a Late Cretaceous to Miocene event. A wide range of known structures at the map and outcrop scales show the effect of slip partitioning on the structural evolution of this area during this period. The dynamic analysis based on folds, fault striations and calcite twin data show a NNE-SSW trend for the compressive axes in this area. The results of dynamic analysis reveal that the orientation of the compressive axes did not change during late Triassic to present. Moreover, they show that the structural evolution of the Bazargan area occurred under the effect of continues deformation phases which is related to contraction, dip slip and strike slip component. Furthermore, the results indicate that the evolution of Bazargan area in the south of Tabas block is compatible with an inclined transpression model.
中文翻译:
伊朗东南部克尔曼地区伊朗中部微大陆Bazargan褶皱和逆冲带中的滑动划分和倾斜压转
可以根据同时收缩,走滑和倾滑剪切来定义斜压转。伊朗东南部的巴扎尔甘地区暴露出一个上地壳倾斜的高压带的例子。与大多数自然压迫带一样,Bazargan地区的变形是非均质的,并且广泛的运动学应变分配导致应变分量及其结果结构的不规则分布。根据结构和地层的图形证据,变形事件分为两个阶段:(1)晚三叠世事件和(2)白垩纪至中新世晚期事件。在地图和露头比例尺上,许多已知的结构都显示出滑脱分区对该区域在此期间的结构演化的影响。基于折痕的动态分析,断层条纹和方解石孪生资料表明该地区受压轴具有NNE-SSW趋势。动力分析的结果表明,在三叠纪晚期到现在,压缩轴的方向没有改变。此外,他们表明,Bazargan地区的结构演化是在连续变形阶段的作用下发生的,变形阶段与收缩,倾滑和走滑分量有关。此外,结果表明,塔巴巴斯地块以南的巴扎尔甘地区的演化与斜压模型是兼容的。他们表明,Bazargan地区的结构演化是在连续变形阶段的作用下发生的,变形阶段与收缩,倾滑和走滑分量有关。此外,结果表明,塔巴巴斯地块以南的巴扎尔甘地区的演化与斜压模型是兼容的。他们表明,Bazargan地区的结构演化是在连续变形阶段的作用下发生的,变形阶段与收缩,倾滑和走滑分量有关。此外,结果表明,塔巴巴斯地块以南的巴扎尔甘地区的演化与斜压模型是兼容的。