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Bulletin de la Societe Geologique de France; May 2006; v. 177; no. 3; p. 145-154; DOI: 10.2113/gssgfbull.177.3.145
© 2006 Societe Geologique de France
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The Tunissian "zone des nappes": a slightly inverted mesocenozoic continental margin (Taberka/Jendouba; northwestern Tunisia)

Mohamed Abdoullah Ould Bagga1, Saâdi Abdeljaouad2 and Eric Mercier3

1 Faculté des Sciences de Gabès, Département des Sciences de la Vie et de la Terre, Cité Riadh Zrig, 6072, Gabès, Tunisie.
2 Faculté des Sciences de Tunis, Laboratoire des Ressources Minérales et Environnement, Campus universitaire, 1060 Tunis, Tunisie.
3 Université de Nantes, Planétologie et Géodynamique (CNRS UMR-6112), 2 rue de la Houssinière, BP 92208, 44322 Nantes cedex 3, France.

Detailed investigations in the western part of the "zone des nappes" in the Tunisian Atlas enable to propose an original model for this area. We show that, according to sedimentary records, these units appear to be formed by various series originally deposited on tilted crustal blocks of the North African margin. This south-easternward tilting occurred from the Triasic to the early Miocene. The first phase of inversion took place during the early to middle Miocene interval; no older compressive event can be highlighted. The shortening is associated with a system of flats and ramps thrust faults that occurs following a piggy-back sequence and that does not disrupt the paleogeographic order. Subsequently, an "out-of-sequence" event places the upper unit (Numidian Unit) onto the sub-numidian Units. The overlap length remains very moderate betwen sub-numidian Units (a few kilometers only). Finally, during the late Quaternary, the area undergoes a late shortening that folds the syn-tectonic basins.

Key Words: Tunisia • Tellian units • Numidian • Inverted margin • Ramp






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