萨尔茨卡默古特中部(奥地利北部钙质阿尔卑斯山脉)的多相构造:一个更新的解释

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Nicola Levi
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引用次数: 0

摘要

北钙质阿尔卑斯山脉(NCA)(奥地利)由分离的奥高山覆盖层组成,主要由二叠纪蒸发岩和三叠纪-侏罗纪碳酸盐岩组成,顶部是不整合的碎屑沉积物(Gosau盆地,晚白垩世-始新世)。NCA在始高山期(侏罗纪-白垩纪中期)经历了多相变形,随后是始新世后的转挤压碰撞构造。在研究区域,最古老的区域结构是达赫斯坦单元在哈尔斯塔特单元上方的始高山NW向逆冲。在始新世-渐新世期间,奥斯特霍恩单元和Höllengebirge单元之间发育了右旋WNWENE Wolfgangsee断层。随后是顶部至N阶段(渐新世?-中新世早期/中期),与Bajuvaric和Rheno-Danubian Flysch上的Tirolic单元的最终侵位有关,这在Höllengebirge单元中导致了与Schafberg逆冲有关的强烈逆冲和褶皱。在中新世中期,Königsee-Lammertal-Taunsee(KLT)左旋断层的发育导致了该地区的主要构造。两个阶梯状走滑区段(SSW-NNE)和(SW-NE/N-S)界定了一个约束弯曲,形成了WNW-ESE Nussensee逆冲断层和Weissenbach背斜。这种变形历史与该地区的一些可用地球动力学模型不一致,反而为亚得里亚海古地理和NCA逆冲作用的开始提供了基本约束。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Polyphase tectonics in the central Salzkammergut (Northern Calcareous Alps, Austria): An updated interpretation

The Northern Calcareous Alps (NCA) (Austria) consist of detached Austroalpine covers, comprising mainly Permian evaporites and Triassic-Jurassic carbonates, topped by unconformable clastic sediments (Gosau Basin, Late Cretaceous-Eocene). The NCA experienced a polyphase deformation during the Eoalpine phase (Jurassic? mid-Cretaceous) followed by post-Eocene transpressive collisional tectonics. In the study area, the oldest regional structure is the Eoalpine NW-ward thrusting of the Dachstein Unit over the Hallstatt Unit. During the Eocene-Oligocene the dextral WNWENE Wolfgangsee fault developed between Osterhorn and Höllengebirge Units. The top-to-N phase followed (Oligocene?-Early/Mid. Miocene), related to the final emplacement of the Tirolic Units on the Bajuvaric and Rheno-Danubian Flysch, which in the Höllengebirge Unit resulted into intense thrusting and folding related to the Schafberg thrust. In the Middle Miocene the development of the Königsee-Lammertal-Traunsee (KLT) sinistral fault led to the major structures in the area. Two stepped strike-slip sectors (SSW-NNE) and (SW-NE/N-S) delimited a restraining bend, where the WNW-ESE Nussensee thrust and the Weissenbach anticline were formed. This deformation history disagrees with some of the available geodynamic models for the area, providing instead fundamental constrains for the Adria paleogeography and the onset of thrusting in the NCA.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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