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Status of basement terranes in orogens. Insights from the Cadomian domain of the North Armorican Variscides, Western France.
Tectonics ( IF 4.2 ) Pub Date : 2021-05-11 , DOI: 10.1029/2020tc006578
Bernard Le Gall 1 , Christine Authemayou 1 , David Graindorge 1 , Anne Duperret 2 , Tassadit Kaci 2 , Axel Ehrhold 3 , Thierry Schmitt 4
Affiliation  

The stable vs mobile behaviour of basement terranes in orogens is discussed about the North Armorican Cadomian‐floored domain (NAD) in the Armorican Variscides, Western France. Our onshore/offshore structural study demonstrates the heterogeneous nature of the NAD which comprises: i) a southern part which remained stable during both the Paleozoic extensional and compressional (Variscan) events and ii) a northern part which was initially the locus of extensive Paleozoic sedimentary basins before recording Variscan deformation. Our work supplies a more complete structural picture of the Variscan pattern in Northern Armorica as a whole: i) as precising the spatial distribution of Variscan strain, ii) as emphazing its importance with a bulk shortening estimated at 30 % in the North Cotentin fold‐and‐thrust belt and iii) as regarding a newly identified pattern of sinistral ductile shear zones in the Morlaix area as lateral ramps that parallel the western edge of the rigid (southern) Cadomian block in a indenter kinematic setting. At a wider scale, compiling structural dataset from others Cadomian terranes in the Variscan belt of Central (Bohemia) and Western (Iberia) Europe leads us to hypothetize that their stability vs reworking during the Variscan orogeny relies primarily on the mechanical/thermal state of their lithosphere at the end of the Paleozoic extensional stage.

中文翻译:

造山带中基底层的状态。来自法国西部北部Armorican Variscides的Cadomian领域的见识。

稳定vs讨论了法国西部阿莫里肯Variscides地区北阿莫里肯Cadomian淹没域(NAD),探讨了造山带基底地下的活动性。我们的岸上/近海结构研究表明,NAD的非均质性包括:i)在古生代伸展和压缩(Variscan)事件中保持稳定的南部,以及ii)最初是广泛的古生代沉积地的北部记录瓦里斯坎变形前的盆地。我们的工作提供了整个北阿莫里卡的Variscan模式的更完整的结构图:i)规定了Variscan应变的空间分布,ii)强调其重要性,估计其在北部Cotentin褶皱-冲断带中缩短了30%,并且iii)考虑到新确定的Morlaix地区的左延性剪切带模式为平行于西边缘的侧向斜坡压头运动学设置中刚性(南部)Cadomian块的位置。在更广泛的范围内,从中欧(波希米亚)和西欧(伊比利亚)的瓦里斯卡纳带,从其他卡多巴山脉的地貌构造数据集,使我们假设它们的稳定性Variscan造山过程中的返工返工主要取决于古生代伸展期结束时岩石圈的机械/热状态。
更新日期:2021-05-12
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