This study focuses on a geological section in the Jura Mountains across the villages of Travers, La Brévine in Switzerland, and Morteau in France. Field mapping was conducted to complement and densify existing data. A kinematically and geometrically consistent forward model has been developed to understand and interpret the observed surface structures. The proposed solution features a low-angle thrust fault with a multiple ramp-flat or staircase trajectory on which several hinterland-verging thrusts nucleate. The main décollement level is located in the Triassic evaporites of the Keuper and Muschelkalk Groups. Our model implies secondary detachments in the Opalinus Clay and the Cretaceous layers leading to repetitions in the Mesozoic cover rocks over large distances. This in turn explains the high topographic position of exposed sediments. The proposed solution is an alternative to models showing overthickening of Triassic evaporites associated with a single detachment level. Along the investigated profile, the Jura Mountains accommodate a shortening of 8.5 km. The kinematic forward model suggests an oscillating sequence of thrusting, rather than a simple, in sequence, forward propagation succession of thrusts.

中文翻译：

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纳沙泰尔汝拉山的构造：从制图和前瞻建模中获得的见解

这项研究的重点是穿越特拉弗斯，瑞士的拉布雷文和法国的莫尔陶村庄的汝拉山脉的地质剖面。进行现场制图以补充和浓缩现有数据。已经建立了运动学和几何学上一致的正向模型，以理解和解释所观察到的表面结构。所提出的解决方案具有低角度推力断层，该断层具有多个斜坡平坦或阶梯形轨迹，在该轨迹上有多个腹地趋向推力成核。主要的分离层位于库珀群和穆斯切尔克群的三叠纪蒸发岩中。我们的模型暗示了Opalinus粘土和白垩纪层中的次生脱离，导致中生代覆岩中的大距离重复。这又解释了裸露沉积物的高地形位置。提出的解决方案是模型的替代方案，该模型显示了与单个分离水平相关的三叠纪蒸发岩的增厚。沿调查的轮廓，汝拉山脉可缩短8.5公里。运动学前向模型提出了一个推力的振荡序列，而不是简单的，依次的推力向前传播演替。