Abstract The High Atlas belt of Morocco is a doubly vergent intracontinental belt formed during Cenozoic convergence between the African and Eurasian plates. This belt is characterized by the simultaneous occurrence of high topographic elevation, minor crustal thickening and weak tectonic shortening, which are commonly explained by models of inversion tectonics and mantle upwelling. This paper aims to test the consistence of this type of model, presenting the results of a multi-scale tectonic study, including mapping of major faults and fault-slip data inversion, from key areas homogeneously distributed through the entire High Atlas. Our data highlight kinematic components parallel to the orogen trend, supporting a transpressional structuring. Integration between new tectonic data and available geophysical and thermochronologic constraints has allowed to extend to depth the main faults detected at the surface, resulting in the overall geometry of a positive flower structure. This scenario is the result of a long history of transpressional and transtensional reactivations of major lithospheric faults since the break-up of Pangea. Lithospheric-scale faults isolate independently-behaving lithospheric blocks characterized by different exhumation rates. In this framework, the compressive component of the transpressional geodynamic regime can produce the high topographic elevation of the High Atlas belt without crustal thickening.

中文翻译：

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摩洛哥高阿特拉斯带的压缩构造

摘要 摩洛哥高阿特拉斯带是新生代非洲板块与欧亚板块辐合形成的双辐陆内带。该带的特点是地貌高程高、地壳轻微增厚和构造缩短弱的同时发生，这通常可以用反转构造和地幔上涌模型来解释。本文旨在测试此类模型的一致性，展示多尺度构造研究的结果，包括从均匀分布在整个 High Atlas 的关键区域绘制主要断层和断层滑动数据反演的结果。我们的数据突出了与造山带趋势平行的运动学分量，支持了压应力结构。新的构造数据与可用的地球物理和热年代学约束之间的整合允许延伸到地表检测到的主要断层的深度，从而形成正花结构的整体几何形状。这种情况是自 Pangea 破裂以来主要岩石圈断层的横压和横张重新激活的长期历史的结果。岩石圈尺度断层隔离了具有不同折返率特征的独立行为的岩石圈块体。在这个框架中，挤压地球动力学机制的压缩分量可以在没有地壳增厚的情况下产生高阿特拉斯带的高地形高程。这种情况是自 Pangea 破裂以来主要岩石圈断层的横压和横张重新激活的长期历史的结果。岩石圈尺度断层隔离了具有不同折返率特征的独立行为的岩石圈块体。在这个框架中，挤压地球动力学机制的压缩分量可以在没有地壳增厚的情况下产生高阿特拉斯带的高地形高程。这种情况是自 Pangea 破裂以来主要岩石圈断层的横压和横张重新激活的长期历史的结果。岩石圈尺度断层隔离了具有不同折返率特征的独立行为的岩石圈块体。在这个框架中，挤压地球动力学机制的压缩分量可以在没有地壳增厚的情况下产生高阿特拉斯带的高地形高程。