Halocinèse précoce associée au rifting jurassique dans l'Atlas central de Tunisie (région de Majoura–El Hfay) |
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Authors: | Dorra Tanfous Amri Mourad Bédir Mohamed Soussi Hajer Azaiez Lahoussine Zitouni M Hédi Inoubli Kamel Ben Boubaker |
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Institution: | 1. Laboratoire des géoressources, Institut national de recherche scientifique et technique, BP 95, 2050 Hammam, Tunisie;2. Département de géologie, UR 99/1004, faculté des sciences de Tunis–El-Manar, campus universitaire, Tunis 1060, Tunisie;3. Entreprise tunisienne d''activité pétrolière, 37, av. Kheireddine-Bacha, 1002 Tunis Montplaisir, Tunisie |
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Abstract: | Seismic and sequence stratigraphy analyses, petroleum-well control and surface data studies of the Majoura–El Hfay region in the Central Atlas of Tunisia had led to identify and calibrate Jurassic seismic horizons. Seismic stratigraphic sections, seismic tectonics analyses, isochron and isopach mapping of Jurassic sequences show a differentiated structuring of platform and depocentre blocks limited by deep-seated NE–SW, north–south east–west and NW–SE faults intruded by Upper Triassic salt. The early salt migration seems to have started by the platform fracturing during the Lower Liassic rifting event. These movements are fossilized by thickness variations of Jurassic horizons, aggrading and retrograding onlap and toplap structures between subsiding rim-syncline gutters and high platform flanks intruded by salt pillows and domes. The salt migration is also attested by Middle and Upper Jurassic space depocentre migrations. Around the Majoura–El Hfay study blocks bounded by master faults, Triassic salt have pierced the Cretaceous and Tertiary sedimentary cover in a salt diapir extrusion and salt wall structures. To cite this article: D. Tanfous Amri et al., C. R. Geoscience 337 (2005). |
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Keywords: | Halocinèse précoce Trias Jurassique Subsurface Rim-syncline Plates-formes Tunisie Early halokinetic Triassic Jurassic Subsurface Rim syncline Platforms Tunisia |
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