The role of pre-existing structures during the building of the Zagros fold-and-thrust belt is a matter of debate. The orientation of the pre-existing basement faults varies in different parts of the Zagros belt. Major directions of the basement faulting in the Arabian plate and Zagros are N–S, NE–SW, NW–SE and E–W. Reactivation of these inherited pre-existing faults occurred at the Cretaceous. In this study, analogue modelling was constructed to test the effect of various orientations of the pre-existing basement faults on the deformation style in the northern boundary of Dezful Embayment. The model consisted of sand layers that partly overlay a viscous layer of silicon above wooden plates. Model results explain the development of deflection in the deformation front and the incompatibility location of faults in the basement and surface. The presence of the basal décollement horizon between the basement and overlying sedimentary sequences separated faulting geometry in the basement from sedimentary cover. Model results suggest that the flexure of the Zagros Mountain Front Faults (ZMFF) in the north part of Dezful Embayment is resulted by reactivation of pre-existing Bala Rud fault (BRF) which is an oblique ramp. The close similarity between the major structures produced during the analogue experiments and those observed in nature, suggests that BRF as a pre-existing basement fault has a major role in the deformation of the structures in the study area.

在扎格罗斯褶皱-冲断带的建造过程中，先前存在的结构的作用尚有争议。预先存在的地下断层的方位在Zagros带的不同部分变化。阿拉伯板块和Zagros的基底断层的主要方向是N–S，NE–SW，NW–SE和E–W。在白垩纪重新激活了这些先前存在的断层。在这项研究中，构建了模拟模型，以测试预先存在的地下断层的各种方位对Dezful Embayment北边界的变形样式的影响。该模型由砂层组成，砂层部分覆盖木板上方的硅粘性层。模型结果解释了变形前沿的变形发展以及基底和表面断层的不相容位置。在地下室和上覆的沉积层序之间存在基底脱层层位，将地下室的断层几何形状与沉积层分开。模型结果表明，Dezful Embayment北部的Zagros Mountain Front Faults（ZMFF）的挠曲是由先前存在的倾斜斜坡Bala Rud断层（BRF）的重新激活引起的。在模拟实验过程中产生的主要结构与自然界中观察到的主要结构之间的相似性表明，BRF作为预先存在的地下断层在研究区域的结构变形中起着重要作用。模型结果表明，Dezful Embayment北部的Zagros Mountain Front Faults（ZMFF）的挠曲是由先前存在的倾斜斜坡Bala Rud断层（BRF）的重新激活引起的。在模拟实验过程中产生的主要结构与自然界中观察到的主要结构之间的相似性表明，BRF作为预先存在的地下断层在研究区域的结构变形中起着重要作用。模型结果表明，Dezful Embayment北部的Zagros Mountain Front Faults（ZMFF）的挠曲是由先前存在的倾斜斜坡Bala Rud断层（BRF）的重新激活引起的。在模拟实验过程中产生的主要结构与自然界中观察到的主要结构之间的相似性表明，BRF作为预先存在的地下断层在研究区域的结构变形中起着重要作用。