3D microstructural architecture of deformed glacigenic sediments associated with large‐scale glacitectonism, Jasmund Peninsula (NE Rügen), Germany

3D microstructural architecture of deformed glacigenic sediments associated with large‐scale glacitectonism, Jasmund Peninsula (NE Rügen), Germany
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德国亚斯蒙德半岛(吕根岛东北部)与大规模冰川运动相关的变形冰川沉积物的 3D 微观结构

DOI:
10.1002/jqs.2843
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发表时间:
--
影响因子:
2.3
通讯作者:
Phillips
Phillips
中科院分区:
地球科学3区
文献类型:
--
作者:
Gehrmann;Hüneke;Meschede;Phillips

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对亚斯蒙德半岛(德国东北部)的维索尔巴赫向斜进行了研究,以了解波罗的海南部地区复杂的冰川构造环境,其中包括来自魏希瑟利亚-普莱尼冰川的褶皱和逆冲断层。利用微形态学和微结构测绘技术,对白垩纪白垩纪(上盘)和更新世沉积物(下盘)之间的向斜西南翼西南倾逆冲断层的软沉积物薄片进行了分析。在断层边界的重聚体中,区分了三种不同的碎屑微纤维:较古老但占主导地位的 S1 纤维;第二个 S2 叶状结构垂直于 S1;以及更年轻的垂直S3结构。这些组构是在大规模褶皱和逆冲作用过程中形成的,随后靠近逆冲断层的组构旋转,伴随着正反层脱水和伸展;这种延伸意味着随着冰的消退,向斜西南翼的后期重新激活和重力松弛。 3D 微观结构模型与宏观信息相结合,开发了一个详细模型,用于了解冰川运动期间维索尔巴赫向斜的演化以及响应冰退缩而导致相关逆冲的局部重新激活。此外,这种方法提供了一个强大的数据集,可以用来解释冰川构造复合体的结构演化。
The Wissower Bach Syncline on the Jasmund Peninsula (NE Germany) has been examined to understand the complicated glacitectonic environment in the southern Baltic Sea region, comprising folds and thrust faults from the Weichselian–Pleniglacial. Soft‐sediment thin sections from a SW‐dipping thrust fault at the south‐western limb of the syncline between Cretaceous chalk (hangingwall) and Pleistocene deposits (footwall) were analysed using micromorphology and microstructural mapping. Within the diamicton bounding the fault, three different clast microfabrics were distinguished: an older, but dominant S1 fabric; a second S2 foliation orientated perpendicular to S1; and a younger subvertical S3 fabric. These fabrics developed during large‐scale folding and thrusting, subsequent fabric rotation adjacent to the thrust fault accompanied by dewatering of the diamicton and extension; the extension implies late‐stage reactivation and gravitational relaxation at the south‐western limb of the syncline as the ice retreated. The combination of a 3D microstructural model and the macroscale information has led to the development of a detailed model for the evolution of the Wissower Bach Syncline during glacitectonism and the localized reactivation of the associated thrusts in response to ice retreat. Moreover, this methodology provides a robust dataset on which to interpret the structural evolution of glacitectonic complexes.
冰川构造复合体的建筑
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