Datation UPb : âge de mise en place du magmatisme bimodal des Jebilet centrales (chaı̂ne Varisque,Maroc). Implications géodynamiques |
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Authors: | Abderrahim Essaifi Alain Potrel Ramon Capdevila Jean-Louis Lagarde |
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Affiliation: | 1. Département de géologie, faculté des sciences Semlalia, B.P. 2390, 40000 Marrakech, Maroc;2. GEOTOP, UQAM, Montréal (Québec), H3C 3P8, Canada;3. Géosciences Rennes, UMR 6118, université de Rennes-1, campus de Beaulieu, 35042 Rennes cedex, France;4. M2C, (UMR 6143 CNRS), université de Caen, 14032 Caen cedex, France |
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Abstract: | The bimodal magmatism of central Jebilet is dated to 330.5+0.68?0.83 Ma by UPb dating on zircons. This age, similar to that of the syntectonic Jebilet cordierite-bearing granitoids, corresponds to the age of the local major tectonometamorphic event. The syntectonic plutonism of the Jebilet massif, composed of tholeiitic, alkaline, and peraluminous calc-alkaline series, is variegated. Magmas emplacement was favoured by the local extension induced by the motion along the western boundary of the Carboniferous basins of the Moroccan Meseta. The Jebilet massif exemplifies the activation of various magmas sources during an episode of continental convergence and crustal wrenching. |
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Keywords: | Datation UPb Magmatisme bimodal Granito??des Varisque Jebilet Maroc UPb dating Bimodal magmatism Granitoids Variscan Jebilet Morocco |
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