Lens-shaped slivers of Permian (Zechstein) amid Triassic units appearing along the master fault of the Sontra Graben in central Germany on the southern margin of the Central European Basin System (CEBS) were studied by means of detailed map analysis, a semi-quantitative forward model, and two balanced cross sections. We show how partial reactivation of the graben's main normal fault and shortcut thrusting in the footwall during inversion, combined with a specific fault geometry involving flats in low-shear-strength horizons, can produce the observed slivers of “exotic” Zechstein. This conceptual model implies that the Sontra Graben was created by about 1200 m of extension followed by some 1000 m of contraction, resulting in the few hundred meters of net extension observed today. Gentle dips and comparatively extensive exposure of some slivers suggest they are backthrust onto the reactivated normal fault's hanging wall, an interpretation corroborated in one location by shallow drilling. Backthrusting appears to have wedged some Zechstein slivers into incompetent Triassic units of the hanging wall. Based on regional correlation, extension most likely occurred in Late Triassic to Early Cretaceous time, while the contraction is almost certainly of Late Cretaceous age. The main aim of this paper is to describe an uncommon structural feature that we interpret to originate from inversion tectonics in an evaporite-bearing succession with multiple detachment horizons but without the presence of thick salt.

中文翻译：

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沿倒置的Sontra Graben（德国黑森州北部）沿“异国情调”的Zechstein条子进位：平衡截面和几何正向建模的线索

通过详细的地图分析，半定量研究了沿着中部欧洲中部盆地系统（CEBS）南缘德国中部桑特拉·格拉本（Sontra Graben）主断裂出现的三叠纪单元中的二叠纪（Zechstein）透镜状条带。前向模型和两个平衡的横截面。我们展示了反转过程中grab部主要法向断层和底盘中的短推力的局部重新激活，再加上涉及低剪切强度层中平坦区域的特定断层几何形状，如何产生观察到的“奇异” Zechstein条。这个概念模型意味着Sontra Graben是由约1200 m的延伸量和约1000 m的收缩量产生的，导致今天观察到的数百米的净延伸量。温和的浸没和某些条带的相对广泛的暴露表明它们在重新激活的正常断层的悬挂壁上反冲，这一解释通过浅钻在一个位置得到了证实。反推似乎将一些Zechstein条子楔入了悬挂墙的无能三叠纪单元中。基于区域相关性，扩张最有可能发生在三叠纪晚期至白垩纪早期，而收缩几乎可以肯定是在白垩纪晚期。本文的主要目的是描述一个不常见的结构特征，我们认为该特征是由含多个分离层但不存在浓盐的含蒸发岩的连续构造的反转构造引起的。一种解释在一个地方通过浅层钻探得到了证实。反推似乎将一些Zechstein条子楔入了悬挂墙的无能三叠纪单元中。基于区域相关性，扩张最有可能发生在三叠纪晚期至白垩纪早期，而收缩几乎可以肯定是在白垩纪晚期。本文的主要目的是描述一个不常见的结构特征，我们认为该特征是由含多个分离层但不存在浓盐的含蒸发岩的连续构造的反转构造引起的。一种解释在一个地方通过浅层钻探得到了证实。反推似乎将一些Zechstein条子楔入了悬挂墙的无能三叠纪单元中。基于区域相关性，扩张最有可能发生在三叠纪晚期至白垩纪早期，而收缩几乎可以肯定是在白垩纪晚期。本文的主要目的是描述一个不常见的结构特征，我们认为该特征是由含多个分离层但不存在浓盐的含蒸发岩的连续构造的反转构造引起的。而收缩几乎可以肯定是白垩纪晚期。本文的主要目的是描述一个不常见的结构特征，我们认为该特征是由含多个分离层但不存在浓盐的含蒸发岩的连续构造的反转构造引起的。而收缩几乎可以肯定是白垩纪晚期。本文的主要目的是描述一个不常见的结构特征，我们认为该特征是由含多个分离层但不存在浓盐的含蒸发岩的连续构造的反转构造引起的。