Mesozoic paleostress evolution in the Saharian platform (southern Tunisia) |
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| Authors: | Eric Barrier Samir Bouaziz Jacques Angelier Gilles Creuzot Jamel Ouali Pierre Tricart |
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| Institution: | 1. Laboratoire de Tectonique Quantitative, Département de géotectonique et URA 1315 CNRS Université P. et M. Curie 4, place Jussieu, T. 26, El, 75252 Paris, Cedex 05, France.;2. Ecole Nationale d’Ingénieur de Sfax, Département de Géologie, route de Soukra, BP W, 3038 Sfax, Tunisie.;3. 35, rue le Coteau, 25115 Pouilley-les-Vigue., France.;4. Institut Dolomieu et URA 718 CNRS, rue M. Gignoux, Université J. Fournier, 38031 Grenoble, France. |
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| Abstract: | AbstractA detailed analysis of brittle deformations in the Saharian platform of southern Tunisia is based on studies of fault-slip data sets and joint sets. It allows reconstruction of the Mesozoic paleostress evolution. During the Permo-Triassic, N-S extensions occurred with high late Permian subsidence rates. During the Norian, strike-slip movements reactivated former normal faults. During the Jurassic and the Cretaceous a succession of extensional events was characterized by : (1) a N-S extension which dominated from late Triassic to early Aptian. We relate this extension to the Africa-Eurasia divergence; (2) a ENE-WSW extension during the Cenomanian. We relate this extension to the opening of «he African basins ; (3) a NE-SW Senonian extension that continued during the Cenozoic in the Jeffara and in the Gabes Gulf, during the further evolution of the northern African margin. The various compressional trends recorded in the platform are attributed to Cenozoic events. |
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| Keywords: | Platform Tunisia Fault Joint Brittle tectonic analysis African plate Tethys Polyphase extension Mesozoic |
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