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首页> 外文期刊>Journal of structural geology >Primary vs. secondary curved fold axes: Deciphering the origin of the Aiet Attab syncline (Moroccan High Atlas) using paleomagnetic data
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Primary vs. secondary curved fold axes: Deciphering the origin of the Aiet Attab syncline (Moroccan High Atlas) using paleomagnetic data

机译：初级弯折轴和次级弯折轴：使用古磁数据破译Aiet Attab向斜线（摩洛哥高图集）的原点

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摘要

The Aiet Attab syncline, located in the Central High Atlas, displays a curved geometry in plan view, and is considered as one of the most spectacular fold shapes in the Central High Atlasic belt. We conducted a paleomagnetic study in Jurassic-Cretaceous red beds to investigate the origin of this geometry. The Natural Remanent Magnetization (NRM) is dominated by a secondary magnetization carried by haematite with unvarying normal polarity that has been dated at about 100 Ma. The regional fold test performed in both limbs of the syncline is positive and the paleomagnetic vectors (after tectonic correction) are parallel throughout the curvature, indicating a negative oroclinal bending test. These results are inconsistent with previous works that consider the bent geometry of this syncline to result from subsequent distortion of originally NE-SW trending structures by rotation about a vertical axis. We interpret the NRM data to demonstrate that the changing trend of the Ait Attab syncline is a primary feature, resulting from the influence of pre-existing, NE-SW and E-W-striking extensional faults that developed during a strike-slip regime. Paleomagnetic results also reveal that the tilting observed in the sampled red beds is post Albian, probably linked to the Cenozoic inversion of the High Atlasic belt.
机译：位于中央高地图集上的Aiet Attab向斜线在平面图中显示弯曲的几何形状，被认为是中央高地图集带中最壮观的褶皱形状之一。我们在侏罗纪-白垩纪红层中进行了古地磁研究，以调查这种几何形状的起源。天然剩磁（NRM）主要由赤铁矿携带的具有恒定法向极性的二次磁化所主导，这种二次磁化可追溯到100 Ma。在向斜线的两个分支中进行的区域褶皱测试为正，古磁矢量（在构造校正后）在整个曲率上平行，表明负眼眶弯曲测试为负。这些结果与先前的研究不一致，后者认为该同步线的弯曲几何形状是由于围绕垂直轴旋转而使原始NE-SW趋势结构的后续变形引起的。我们对NRM数据进行解释，以证明Ait Attab向斜的变化趋势是主要特征，这是由走滑过程中预先存在的NE-SW和E-W引起的伸展断层的影响引起的。古磁结果还表明，在采样的红层中观察到的倾斜是在阿尔比亚后，可能与高Atlasic带的新生代反演有关。

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  • 来源
    《Journal of structural geology》 |2015年第1期|65-77|共13页
  • 作者

    B. Moussaid; J.J. Villalain; A. Casas-Sainz; H. El Ouardi; B. Oliva-Urcia; R. Soto; T. Roman-Berdiel; S. Torres-Lopez;

  • 作者单位

    Dep. de Geologie, Faculte des Sciences, Universite Moulay Ismail, BP. 11201 Zitoune, Meknes, Morocco;

    Dpto. de Fisica, Escuela Politecnica Superior, Universidad de Burgos, Avd Cantabria S/N, 09006 Burgos, Spain;

    Dpto. de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain;

    Dep. de Geologie, Faculte des Sciences, Universite Moulay Ismail, BP. 11201 Zitoune, Meknes, Morocco;

    Dpto.de Geologia y Geoquimica, Facutad de Ciencias, Universidad Autonoma de Madrid, Calle Francisco Tomas y Valiente, 7, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain;

    Instituto Geologico y Minero de Espana, Unidad de Zaragoza, C/ Manuel Lasala 44, 9B, 50006 Zaragoza, Spain;

    Dpto. de Ciencias de la Tierra, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain;

    Dpto. de Fisica, Escuela Politecnica Superior, Universidad de Burgos, Avd Cantabria S/N, 09006 Burgos, Spain;

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  • 正文语种 eng
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  • 关键词

    Paleomagnetism; Remagnetization; Fold test; Oroclinal bending; Aiet Attab syncline; Moroccan High Atlas;

    机译：古磁性磁化;折叠测试;口弯Aiet Attab同步线;摩洛哥高级地图集;

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