Jaillard Etienne, Bouillin J. P., Ouali J., Dumont T., Latil J. L., Chihaoui A. (2017). Albian salt-tectonics in Central Tunisia : evidences for an Atlantic-type passive margin. Journal of African Earth Sciences, 135, p. 220-234. ISSN 1464-343X.
Titre du document
Albian salt-tectonics in Central Tunisia : evidences for an Atlantic-type passive margin
Jaillard Etienne, Bouillin J. P., Ouali J., Dumont T., Latil J. L., Chihaoui A.
Source
Journal of African Earth Sciences, 2017,
135, p. 220-234 ISSN 1464-343X
Tunisia is part of the south-Tethyan margin, which comprises Triassic evaporites and a thick series of Jurassic and Cretaceous, mainly marine deposits, related to the Tethyan rifting evolution. A survey of various Cretaceous outcrops of central Tunisia (Kasserine-El Kef area), combined with literature descriptions, shows that the style of Albian deformation changes from the proximal (South) to the distal part (North) of the margin. The southern part is dominated by tilted blocks and growth faults, which evolve to the north to turtle-back and roll-over structures. Farther North, deformation is dominated by the extrusion of diapirs and salt walls. Such a distribution of deformation strongly suggests that the whole sedimentary cover glided northward on the Triassic evaporites during Albian times, as described for the Atlantic passive margin or for the Gulf of Mexico. Subsequently, these halokinetic structures have been folded during Alpine compressional tectonics.
Plan de classement
Géologie et formations superficielles [064]
;
Géophysique interne [066]
