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Geological Society, London, Special Publications; 2006; v. 262; p. 55-74;
DOI: 10.1144/GSL.SP.2006.262.01.03
© 2006 Geological Society of London

Aptian sedimentation: an example of interaction between tectonics and eustatics in Central Tunisia

Fredj Chaabani1 & Salwa Razgallah2

1 Université de Tunis El Manar, Faculté des Sciences de Tunis, Département de Géologie, Laboratoire des Ressources Minérales et Environnement, 1060 Tunis, Tunisia fredjchaabani{at}yahoo.com
2 Université de Tunis El Manar, Faculté des Sciences de Tunis, Département de Géologie, Laboratoire de Biostratigraphie, 1060 Tunis, Tunisia

To reconstruct the sequence evolution and distribution of deposits during the Aptian in the Central Tunisian platform, the present study was mainly based on a sedimentological approach. The palaeogeographical reconstruction shows an inner and an external platform separated by the highs of the Central Tunisian islands. These are characterized by carbonate-dominated deposits evolving towards the north into a pelagic marl-dominated sedimentation. The NW-SE-to east-west-directed faults show an important sedimentary control. In fact, a system of tilted blocks located towards the SW characterizes a large part of the platform. The subsidence evolution during the Aptian was marked by a recovery of extensional tectonics. Finally, some halokinetic vertical movements were responsible for several highs during the latest Barremian. The Central Tunisian platform evolution was controlled by drift of the African platform during the opening of the Atlantic Ocean.