Le Carbonifère du Maroc central : les formations de Migoumess,de Tirhela et d'Idmarrach. Lithologie,biostratigraphie et conséquences géodynamiquesThe Carboniferous formations of Migoumess,Tirhela and Idmarrach (central Morocco): lithology,biostratigraphy and geodynamic consequences |
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| Authors: | Mostafa Berkhli Daniel Vachard |
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| Affiliation: | 1. UFR d''analyse et prospection des bassins sédimentaires, département de géologie, faculté des sciences, université Moulay-Isma??l, BP 4010, 50000 Meknès, Maroc;2. Université des sciences et technologies de Lille, Upresa 8014 du CNRS, UFR des sciences de la Terre, laboratoire LP 3, 59655 Villeneuve d''Ascq cedex, France |
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| Abstract: | New biostratigraphical data based on foraminifers, algae and pseudo-algae indicate that the limestone pebbles of the channelized polygenic conglomerates of the Migoumess formation contain Late Visean (V3bγ–V3c) assemblages. That confirms the Westphalian age attributed to this formation by Hollard [Zdt. Geol. Ges. 129 (1978) 495–512]. The Tournaisian age assigned to it by palynology [C. R. Acad. Sci. Paris, série II 310 (1990) 1573–1576] cannot be retained. The Tirhela formation, Late Visean and Serpukhovian (E1) in age, is coeval with the Akerchi formation [Berkhli, thèse d'État, 1999; Berkhli et al., J. Afr. Earth Sci. (accepté)]. The Idmarrach formation, mapped as a thrust sheet [C. R. Acad. Sci. Paris, série II 310 (1990) 1573–1576], is dated as Serpukhovian (E1) and its thrusting is consequently post-Serpukhovian. Palaeogeographic and geodynamic consequences are listed. To cite this article: M. Berkhli, D. Vachard, C. R. Geoscience 334 (2002) 67–72 |
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| Keywords: | Central Morocco Carboniferous sediments biostratigraphy palaeogeography geodynamic Maroc central Carbonifère sédiments biostratigraphie paléogéographie géodynamique Stratigraphie Stratigraphy |
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