The Anti-Atlas Pan-African Belt (Morocco): Overview and pending questions - 31/08/18
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Abstract |
Between the High Atlas and the Saharan platform, the Anti-Atlas of Morocco offers large exposures of Precambrian rocks beneath the moderately folded Paleozoic series. These inliers allow reconstructing a segment of the Pan-African Belt and of its foreland at the northern outskirts of the West African Craton (WAC). From ∼885 Ma to ∼540 Ma, three periods are recognized in the Pan-African cycle. The Tonian–Cryogenian period ends with the obduction of supra-subduction ophiolite and oceanic arc material at ∼640 Ma. The Early Ediacaran period is marked by the development and subsequent closure of a wide marginal basin next to a likely Andean-type arc. The Late Ediacaran period is recorded by subaerial molasse deposits associated with post-collisional high-K calc-alkaline to shoshonitic magmatism. Although a wide consensus has been reached based on the number of new robust datings, several questions still remain pending, which we address taking into account relevant African and European correlations.
Le texte complet de cet article est disponible en PDF.Keywords : Paleoproterozoic, Neoproterozoic, Collision belt, Eburnian, Pan-African, Anti-Atlas, Post-collisional magmatism
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Vol 350 - N° 6
P. 279-288 - septembre 2018 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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