The transition to a post‐orogenic state in mountain ranges has been identified by a change from active subsidence to isostatic rebound of the foreland basin. However, the nature of the interplay between isostatic rebound and sediment supply, and their impact on the topographic evolution of a range and foreland basin during this transition, has not been fully investigated. Here, we use a box model to explore the syn‐ to post‐orogenic evolution of foreland basin/thrust wedge systems. Using a set of parameter values that approximate the northern Pyrenees and the neighbouring Aquitaine foreland basin, we evaluate the controls on sediment drape over the frontal parts of the retro‐wedge following cessation of crustal thickening. Conglomerates preserved at approximately 600‐m elevation, which is ~ 300 m above the present mountain front in the northern Pyrenees are ca. 12 Ma, approximately 10 Myrs younger than the last evidence of crustal thickening in the wedge. Using the model, this post‐orogenic sediment drape is explained by the combination of a sustained, high sediment influx from the range into the basin relative to the efflux out of the basin, combined with cessation of the generation of accommodation space through basin subsidence. Post‐orogenic sediment drape is considered a generic process that is likely to be responsible for elevated low‐gradient surfaces and preserved remnants of continental sedimentation draping the outer margins of the northern Pyrenean thrust wedge.

中文翻译：

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使用盒模型解释了北比利牛斯山造山后沉积物的悬垂性

从前陆盆地的活动沉降到等静回弹的变化，已经确定了山脉向造山后阶段的过渡。然而，在此过渡期间，等静回弹与沉积物供应之间相互作用的性质，以及它们对山脉和前陆盆地地形演变的影响，尚未得到充分研究。在这里，我们使用箱形模型探索前陆盆地/逆冲楔系统的造山运动到后造山演化。使用一组近似北比利牛斯山脉和邻近的阿基坦前陆盆地的参数值，我们评估了地壳增厚停止后，逆楔带前部沉积物垂悬的控制。砾岩保存在大约600-m的高度，它比比利牛斯山脉北部目前的山峰高约300 m。12 Ma，比楔形中地壳增厚的最后证据年轻约10 Myrs。使用该模型，这种造山后沉积物的垂下现象是由相对于盆地流出的一定范围内持续大量的沉积物流入盆地引起的，再加上通过盆地沉降来停止容纳空间的产生。造山后沉积物垂悬被认为是一个普遍的过程，可能是造成低梯度表面升高和大陆沉积物残留的残留物，覆盖了北比利牛斯山脉逆冲楔的外缘。造成这种造山后沉积物的原因是，相对于从盆地流出的水量，从该区域进入盆地的持续大量泥沙涌入，再加上由于盆地沉降而停止了容纳空间的产生。造山后沉积物垂悬被认为是一个普遍的过程，可能是造成低梯度表面升高和大陆沉积物残留的残留物，覆盖了北比利牛斯山脉逆冲楔的外缘。造成这种造山后沉积物的原因是，相对于从盆地流出的水量，从该区域进入盆地的持续大量泥沙涌入，再加上由于盆地沉降而停止了容纳空间的产生。造山后沉积物垂悬被认为是一个普遍的过程，可能是造成低梯度表面升高和大陆沉积物残留的残留物，覆盖了北比利牛斯山脉逆冲楔的外缘。