L'ouverture et le développement du bassin de Morondava (Madagascar) du Carbonifère supérieur au Jurassique moyen. Données stratigraphiques, sédimentaires, paléontologiques et structurales |
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| Authors: | Alain Piqu Edgard Laville Grard Bignot Mamy Rabarimanana Catherine Thouin |
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| Institution: | 1 Département des Sciences de la Terre et IUEM, Université de Bretagne occidentale, 29285 Brest, France;2 Département de Géologie, Université de Caen, 14032 Caen Cedex, France;3 Laboratoire de Micropaléontologie, C 104, Université P. et M. Curie, 4 place Jussieu, 75005 Paris, France;4 Département de Géologie, Faculté des Sciences, BP 906, Antananarivo, Madagascar |
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| Abstract: | In the western part of Madagascar, the Morondava Basin shows the Malagasy Karoo series, made of Late Carboniferous-Mid-Permian (Sakoa), Late Permian-Mid-Triassic (Sakamena) and Late Triassic-Mid-Jurassic (Isalo) sequences. The sedimentary facies are mainly aerial and clastic in the series, and the marine conditions are fully established after Lower Jurassic times, when the strait between Africa and Madagascar was flooded.The Karoo basins where these series were deposited are mainly hemi-grabens. Their filling proceeded from west to east and from south to north. Distinction between the southern and northern part of the Morondava Basin suggests that development of the basin was controlled by old crustal weakness zones trending north-northwest-south-southeast and north-northeast-south-southwest. |
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