Structural relationships between Helminthoid Flysch and Briançonnais Units in the Marguareis Massif: A key for deciphering the finite strain pattern in the external southwestern Alps,Geological Journal

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Structural relationships between Helminthoid Flysch and Briançonnais Units in the Marguareis Massif: A key for deciphering the finite strain pattern in the external southwestern Alps
Geological Journal ( IF 1.4 ) Pub Date : 2020-11-27 , DOI: 10.1002/gj.4040
Edoardo Sanità _{1,

2} , Jean Marc Lardeaux ₃ , Michele Marroni _{1,

4} , Guido Gosso ₅ , Luca Pandolfi _{1,

4}

Affiliation

The structural setting and tectonic evolution of the Marguareis Massif (located at the boundary between the Maritime and Ligurian Alps) has long been matter of debate. After new meso‐ and micro‐structural studies and field investigations, the tectonic unit interplay outlines a finite structural architecture more complex than that proposed in previous interpretations. We depict a stack of Briançonnais Units stemming from the Europe continental margin, and the Helminthoid Flysch Unit, detached from its original basement whose original palaeogeographic domain is still a matter of debate. Our results highlight for the first time that each unit recorded different pre‐stacking folding events progressively developed at different structural levels. The events occurred during the stacking of the units produced shear zones with top‐to‐SW sense of movement. After the syn‐stacking tectonics achieved during the Late Eocene‐Early Oligocene collisional events, the whole stack recorded the same post‐stacking deformation history here represented by a fold system with sub‐horizontal axial planes and faults. Similar tectonic evolution was documented in other sectors of the Western Alps by previous authors.

中文翻译：

Marguareis地块中蠕虫类Flysch和Briançonnais单元之间的结构关系：破解西南阿尔卑斯山外部有限应变模式的关键

马尔瓜雷斯山脉（位于海事和利古里亚阿尔卑斯山之间的边界）的结构背景和构造演化一直是争论的话题。经过新的细观和微观结构研究以及野外调查，构造单元的相互作用勾勒出一个有限的结构体系，其结构比以前的解释所提出的更为复杂。我们描绘了一堆源自欧洲大陆边缘的Briançonnais单位和Helminthoid Flysch单位，与原始地下室分离，而原始地下室的原始古地理范围仍然存在争议。我们的结果首次突显了每个单元记录的不同叠前折叠事件在不同结构级别上逐渐发展的情况。这些事件发生在单元堆叠产生的剪切区时，具有从顶部到SW的运动感。在晚始新世-早渐新世碰撞事件中达到同叠层构造之后，整个叠层记录了相同的叠后变形历史，这里以具有次水平轴向平面和断层的褶皱系统为代表。先前的作者在西阿尔卑斯山的其他地区也记录了类似的构造演化。

更新日期：2020-11-27

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