L'extension à Madagascar du Néogène à l'Actuel: arguments structuraux et géophysiques |
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| Authors: | Alain Piqu Edgard Laville Pierre Chotin Jean Chorowicz Solofo Rakotondraompiana Catherine Thouin |
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| Institution: | 1 Département des Sciences de la Terre, Université de Bretagne occidentale, 29285 Brest Cedex, France;2 Département de Géologie, Université de Caen, 14032 Caen Cedex, France;3 Département de Géotectonique, UPMC, 75252 Paris Cedex 05, France;4 Université d'Antananarivo, Antananarivo, Madagascar |
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| Abstract: | Field studies and observations from aerial photographs, remote sensing and numerical field models show that the Meso-Cenozoic and Recent sedimentary sequences of Madagascar are affected by normal faults. These faults, north-south, north-northeast-south-southwest and north-northwest-south-southwest trending, are responsible for the following morphological effects: scarps, block tilting and opening of faulted basins, the most important of which being the Lake Alaotra Basin. The general orientation of these brittle structures and some observations in the field show tha the horizontal maximum extension isroughly east-west directed. Other lines of evidence, seismic and gravimetric, confirm that Madagascar is presently submitted to a crustal and lithospheric extension, parallel to that in East Africa and the Mozambique Channel. |
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