First-order kinematic problems of salt-influenced inversion structures

我们在德国中部的两个案例研究(Oberes Allertal和Sontra)上提出了一个研究复杂反转构造运动学发展的项目。我们将针对在之前的SPP子项目中确定的特定的、反复出现的结构特点。这些都不符合文献中提出的反转结构模型。运动学重建是理解这种复杂结构的有效工具，即使在反向裂谷和地台构造的演化与底辟作用相结合的情况下，也很难进行定量恢复。晚白垩世收缩的盆地范围内均匀的脉动提供了识别主要因素的机会，如初始盐厚度或盐上地层的变化，这些因素导致了同一构造环境下不同构造类型的演化。在观测到的反转构造频谱中，这两个目标区代表了盐影响程度不同的端元。通过钻井、采矿和最近的地质填图，对艾勒塔尔构造进行了很好的勘探。Sontra的研究将受益于在德国中部规划和建设A44高速公路期间创建的高分辨率数据库。

We propose a project to study the kinematic development of complex inversion structures on two case studies in Central Germany (Oberes Allertal and Sontra). We will target specific, recurrent structural peculiarities identified in a preceding SPP subproject. These fit none of the models proposed in the literature for inversion structures. Kinematic reconstruction is an efficient tool to understand such complex structures, even where the evolution of inverted rifts and graben structures is combined with diapirism that makes quantitative restoration difficult. The basinwide, uniform pulse of Late Cretaceous contraction offers the opportunity to identify the principal factors, such as the initial salt thickness or variations of the suprasalt stratigraphy, that led to the evolution of different structure types in the same tectonic environment. In the spectrum of inversion structures observed, the two target areas represent end members with different degrees of salt influence. The Allertal structure is well explored through drilling, mining and recent geological mapping. The Sontra study will benefit from the high resolution database created during planning and construction of the A44 motorway in Central Germany.