Les granitoïdes néoprotérozoïques de Khzama, Anti-Atlas central, Maroc: marqueurs de l'évolution d'un magmatisme d'arc à un magmatisme alcaline |
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Authors: | T El-Khanchaoui M Lahmam A El-Boukhari H El-Beraaouz |
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Institution: | a Département de Géologie, Faculté des Sciences Ben M'sik, Université Hassan II Mohammédia, BP 7955 Casablanca, Maroc;b Département de Géologie, Faculté des Sciences Semlalia, Université Cadi Ayad, BP S15 Marrakech, Maroc;c Départment de Géologie, Faculté des Sciences, Université Ibnou Zohr, BP 28/S Agadir, Maroc |
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Abstract: | Petrological study and zircon typology provide important information that is related to the classification and genesis of Neoproterozoic granitoids in the Khzama area (northeast Siroua). The Pan-African granitoids show a transition from island-arc magmatism to alkaline magmatism. A space and time zonation of magmatism from the north to the south is evident. Early Pan-African granitoids were generated from various magma sources through different petrogenetic mechanisms. The first association corresponds to the low-K calc-alkaline plutons of Ait Nebdas, the second one correponds to high-K calc-alkaline post-collisional granites (Tamassirte-Tiferatine and Ifouachguel). Finally, shoshonitic magmatism (Irhiri) ends the magmatic evolution of the region. Thus, the late Pan-African granitic plutonism began with calc-alkaline associations and ended with K-alkaline magmatism in a transtensional setting, heralding the onset of the Moroccan Palæozoic cycle. |
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