Evaporites play a major role in the evolution of an orogenic wedge, modifying the shape and the deformation kinematics inside the wedge. Salt tectonics can occur at various stages, but early salt activity can create a structural inheritance which compartmentalizes the building of the sedimentary succession and the mechanical architecture of the orogenic wedge. Sub‐Alpine fold‐and‐thrust belts commonly show evidence of inherited salt‐related structures, which were mostly described as having been initiated during the Liassic Tethyan rifting. However, even though a few authors tried to introduce salt tectonics as a major factor in the Alpine history, most of the interpretations underestimate the phenomenon. In this paper, we show that the Digne Nappe area presents many salt‐controlled structures within both the Digne and the Authon‐Valavoire thrust sheets. Salt activity began during the Hettangian and continued through the whole Jurassic. At a larger scale, our observations show alignments of salt‐controlled structures following NW–SE and NNE–SSW directions, as well as preferential locations at tectonic unit boundaries. Distribution of salt structures seems to follow a well‐defined pattern directly inherited from the rifting, and this strongly influences deformation of the sub‐Alpine domain.

中文翻译：

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西南亚高山褶皱冲断带的侏罗纪盐构造

蒸发物在造山楔的演化中起着重要作用，它改变了楔内的形状和变形运动学。盐构造可以发生在不同的阶段，但是早期的盐活动可以产生结构上的继承性，从而将沉积演替的构造和造山楔的机械构造分隔开来。亚高山褶皱冲断带通常显示出与盐有关的结构的遗传证据，这些构造大多被描述为是在拉西斯特提斯裂谷过程中开始的。然而，尽管少数作者试图将盐构造作为阿尔卑斯历史上的一个主要因素，但大多数解释都低估了这种现象。在本文中，我们表明，迪格纳普地区在迪格和Authon-Valavoire冲断层中都表现出许多盐控结构。盐活动始于黑塘时期，并一直持续到整个侏罗纪。从更大的角度来看，我们的观测结果表明，盐控结构沿西北—东南和北北—南西南方向排列，并在构造单元边界处处于优先位置。盐结构的分布似乎遵循从裂谷直接继承的明确模式，这强烈影响了亚高山域的变形。