Centrifuge analog modeling incorporating thickness variations of décollement and overlying sedimentary cover is used to study thrust-wedge evolution on salt-detached contractional systems involving tapered sedimentary cover. From simpler, layer-cake to 3D tapered décollement-cover sequences, our models constrain wedge evolution: a more advanced front, where the cover is thicker, promotes differential frontal translation and triggers vertical axis rotation of several hinterland anticlines which appear towards the thinner cover area. In all cases, the décollement level is strongly sheared and tends to migrate laterally toward the thinner cover areas. Models are compared with previous analog models under normal gravity and the natural example of the South Pyrenean Central salient. All in all, we conclude that a 3D tapered décollement-cover basin architecture, as a sole factor, can determine the formation of a thrust salient formed by increasing structural curvature (progressive arc).

离心模拟模型结合了脱层和上覆沉积盖层的厚度变化，用于研究涉及锥形沉积盖层的盐分离收缩系统的逆冲楔演化。从更简单的层蛋糕到 3D 锥形脱盖序列，我们的模型限制了楔形演化：更先进的前缘，其中盖层更厚，促进不同的正面平移并触发几个腹地背斜的垂直轴旋转，这些背斜出现在较薄的盖层区域。在所有情况下，分离层都受到强烈剪切，并倾向于横向迁移到较薄的覆盖区域。将模型与正常重力下的先前模拟模型和南比利牛斯中央突出部的自然示例进行比较。总而言之，我们得出结论，3D 锥形作为唯一因素，脱盖-覆盖盆地结构可以确定通过增加构造曲率（渐进弧）形成的逆冲凸起的形成。