Salt lithologies are mechanically weaker than other sedimentary rocks. Salt horizons usually act as décollements and precursor salt bodies preferentially deform early during contraction, concentrate deformation, and impact the structural style and kinematics during mountain building. Focusing on shortened isolated-diapir provinces, our analog modeling program investigates the influence of two salt walls on folding and thrusting.

High resolution topographic scans and particle image analysis show that the presence of precursor diapirs impacts the layer parallel shortening patterns and presumably the stress field at the onset of contraction. Shortening concentrates on diapirs, leading to roof arching, crestal extension and salt extrusion. This sequence of events occurs earlier on thinner salt-sediment sequences including diapirs having well-developed pedestals, particularly when proximal to the deformation front. Folds and thrusts nucleate at salt walls if they feature a well-developed pedestal. Further shortening results in secondary welding as evidenced by the collapse of uplifted roof domes, cessation of indentation and reverse faulting nucleated at the secondary welds. Meanwhile, and depending upon the processes occurring on the diapir closer to the backstop, the deformation of the distal salt wall is discontinuous.

Our modeling results are compared with experimental works and natural examples from the Fars (Zagros Mountains).

盐岩性在力学上比其他沉积岩弱。盐层通常作为下层，前体盐体在收缩过程中优先变形，集中变形，并在造山过程中影响结构样式和运动学。我们的模拟建模程序着眼于缩短的孤立底辟省，研究了两个盐壁对折叠和逆冲的影响。

高分辨率地形扫描和粒子图像分析表明，前体底辟的存在会影响层平行缩短模式，并可能影响收缩开始时的应力场。缩短集中在底辟，导致屋顶拱起、牙顶伸展和盐分挤压。这一系列事件发生在较薄的盐沉积物序列上，包括具有发育良好基座的底辟，特别是在变形前沿附近时。如果盐壁具有发育良好的基座，则褶皱和逆冲会在盐壁上成核。进一步缩短会导致二次焊接，这可以通过隆起的屋顶圆顶的倒塌、压痕停止和二次焊缝处成核的反向断层形成来证明。同时，根据底辟更靠近逆止器上发生的过程，

我们的建模结果与来自法尔斯（扎格罗斯山脉）的实验工作和自然实例进行了比较。