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Late Pan-African Murzuq event in the Central Hoggar: Sinistral displacement along the Ounane major shear zone (Gour Oumelalen, Algeria) shown by the magnetic fabric of the Tisselliline pluton
Journal of African Earth Sciences ( IF 2.2 ) Pub Date : 2021-07-16 , DOI: 10.1016/j.jafrearsci.2021.104333
O. Nouar 1 , B. Henry 2 , J.P. Liégeois 3 , M. Amenna 1 , N. Abdallah 4 , M.E.M. Derder 1 , M. Ayache 1
Affiliation  

The late upper-level subcircular Tisselliline pluton (c. 572 Ma), emplaced in Hoggar along the major Pan-African Ounane shear zone, is NNW-SSE oriented. Its magnetic fabric is mainly characterized by dome-shaped magnetic foliations and subhorizontal magnetic lineations. When approaching the nearby Ounane shear zone, the lineations become associated with a prolate shape of the fabric and their direction evolves from NE-SW to NNE-SSW. This highlights a stretching underwent by the pluton during its late magmatic stage, in agreement with the shape of the pluton itself. These characteristics indicate a sinistral movement along the Ounane shear zone during the emplacement of the Tisselliline pluton. It is the opposite to the dextral movement that affected earlier the older Ounane batholith (c. 629 Ma) located on the other side of the shear zone. This sinistral movement can be related to the NE-SW compression that occurred in the Eastern Hoggar, western part of the Saharan metacraton, during the Murzukian event. Its age, given by the Tisselliline pluton age (c. 572 Ma), corresponds indeed to the initiation of this event (575-555 Ma). This shows that the Eastern Hoggar Murzukian event affected also the Central Hoggar, even if with a much lower intensity.



中文翻译:

中部 Hoggar 晚期泛非 Murzuq 事件:Tisselliline 岩体的磁性结构显示沿 Ounane 主剪切带(Gour Oumelalen,阿尔及利亚)的左旋位移

沿主要泛非 Ounane 剪切带位于 Hoggar 的晚期上层亚圆形 Tisselliline 岩体(约 572 Ma)是 NNW-SSE 取向的。其磁性织物的主要特征是圆顶状的磁叶纹和亚水平的磁纹纹。当接近附近的 Ounane 剪切带时,线条变得与织物的扁长形状相关,它们的方向从 NE-SW 演变为 NNE-SSW。这突显了岩体在其岩浆晚期晚期所经历的拉伸,与岩体本身的形状一致。这些特征表明在 Tisselliline 岩体就位期间沿 Ounane 剪切带发生了左旋运动。它与较早影响年长 Ounane 的右旋运动相反基岩(约 629 Ma)位于剪切带的另一侧。这种左旋运动可能与 Murzukian 事件期间发生在东 Hoggar、撒哈拉元克拉通西部的 NE-SW 压缩有关。它的年龄由 Tisselliline 岩体年龄(约 572 Ma)给出,确实对应于该事件的开始(575-555 Ma)。这表明东部 Hoggar Murzukian 事件也影响了中部 Hoggar,即使强度要低得多。

更新日期:2021-08-03
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