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- W2062642281 abstract "The post-Variscan uplift of the western Anti-Atlas Precambrian core is studied by zircon fission track (ZFT) analysis of ten samples of granites and schists from the Kerdous and Ifni inliers. All samples yield Carboniferous ZFT ages ranging from 358 ± 31 Ma to 319 ± 32 Ma, with nine dates younger than 338 ± 35 Ma. The weighted mean age calculated for these nine samples is 328 ± 30 Ma. These results compare with the available K–Ar datings of white mica and biotite from the same rocks or from the overlying Ediacaran-Cambrian low-grade metasediments. The fact that different systems with distinct closure temperatures yield similar ages suggests the occurrence of a short Carboniferous thermal event followed by rapid cooling. Consistent with the regional geological framework, the thermal event is assigned to the Variscan folding, being followed by rapid exhumation and cooling related to the post-folding erosion. Dix échantillons, prélevés dans les boutonnières de Kerdous et Ifni, ont été datés par la méthode des traces de fission sur zircon (ZFT), en vue d’étudier le soulèvement postvarisque du socle précambrien de l’Anti-Atlas occidental. Tous les échantillons ont fourni un âge Carbonifère, neuf résultats sur dix étant groupés entre 338 ± 35 Ma et 319,3 ± 32 Ma, avec une moyenne pondérée de 328 ± 30 Ma. Ces résultats sont comparables aux datations K–Ar disponibles sur mica blanc et biotite pour ces mêmes roches et pour les métasédiments d’âge Édiacarien-Cambrien qui les recouvrent. Le fait que ces différents systèmes donnent des résultats équivalents suggère un événement thermique court au Carbonifère, suivi par un refroidissement rapide. En accord avec les données géologiques régionales, l’événement thermique est attribué au plissement varisque. Celui-ci est suivi d’une exhumation rapide due à l’érosion." @default.
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- W2062642281 date "2009-01-01" @default.
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- W2062642281 title "Vertical movements at the fringe of the West African Craton: First zircon fission track datings from the Anti-Atlas Precambrian basement, Morocco" @default.
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- W2062642281 doi "https://doi.org/10.1016/j.crte.2008.11.006" @default.
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