Les dykes basiques du massif ancien de l'Ourika (Atlas de Marrakech,Maroc) : géochimie et significationThe basic dykes of the Ourika old massif (High Atlas of Marrakech): Geochemistry and significance |
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| Authors: | Ahmed Barakat Christian Marignac Mohamed Bouabdelli |
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| Institution: | 1. Département de géologie, faculté des sciences et techniques, BP 523, Béni-Mellal, Maroc;2. École des mines de Nancy, Parc de Saurupt, 54042 Nancy, France;3. Département de géologie, faculté des sciences Semlalia, BP S15, Marrakech, Maroc |
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| Abstract: | The Precambrian massif of Ourika is crosscut by two systems of basic dykes, striking N40°E and N90–120°E. Using incompatible trace elements, the two systems form two distinct chemical groups, displaying a continental tholeiitic affinity. The composition variations between the two defined groups can be due to heterogeneities of mantle sources and to contamination, during the magma ascent, by the continental crust. The emplacement of these basic dykes, before the late-PIII formations, can be related to the Neoproterozoic distension generalised to the Anti-Atlas chain. To cite this article: A. Barakat et al., C. R. Geoscience 334 (2002) 827–833. |
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| Keywords: | Ourika old massif High Atlas terminal Neoproterozoic basic dykes geochemistry Morocco massif ancien de l'Ourika Haut Atlas Néoprotérozo??que terminal dykes basiques géochimie Maroc |
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