Tectonique quaternaire et plis de rampe dans le golfe d'Hammamet (offshore tunisien) |
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| Authors: | Malika Ben Romdhane Noureddine Brahim Jamel Ouali Éric Mercier |
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| Institution: | 1. Laboratoire de géologie, École nationale d''ingénieur de Sfax, BP W, 3038 Sfax, Tunisie;2. ISET de Nabeul, département de géomatique et gestion de territoire, campus universitaire, PB 198-8000 Nabeul, Tunisie;3. IPEIS de Sfax, laboratoire de géologie, École nationale d''ingénieur de Sfax, BP W, 3038 Sfax, Tunisie;4. UMR CNRS 6112, planétologie et géodynamique, université de Nantes, 2, rue de la Houssinière, BP 92208, 44322 Nantes cedex 3, France |
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| Abstract: | The Jriba trough is an Upper Miocene graben located within the Tunisian offshore Gulf of Hammamet area, east of the Atlas front. This distensive structure suffered a compressive event during the Early Quaternary (Villafranchian). The Jriba structure was previously interpreted as ‘flower structure’, which possibly complicated by halokinetics movements. A new analysis of a set of seismic lines crossing the Jriba trough allows us to propose a new tectonic model where the Villafranchian deformation is characterized by (1) occurrence of a decollement level cutting Messinian to Pliocene layers; and (2) the growth of fault-related folds (fault-propagation fold). The NE–SW Miocene, inherited normal faults, locate the position of the ramps and folds whereas the NW–SE inherited normal faults are reactivated as tear faults. These NW–SE tear faults define various domains of different shortening values (one kilometre at maximum). To cite this article: M. Ben Romdhane et al., C. R. Geoscience 338 (2006). |
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| Keywords: | Tunisie Villafranchien Pli de propagation Faille de déchirure Tunisia Villafranchian Fault-propagation fold Tear fault |
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