期刊
JOURNAL OF AFRICAN EARTH SCIENCES
卷 135, 期 -, 页码 220-234出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jafrearsci.2017.09.009
关键词
Albian; Central Tunisia; Salt tectonics; Passive margin
资金
- Ministries of Foreign Affairs of France and Tunisia [Utique - 07G1008]
- French Institut de Recherche pour le Developpement (IRD)
- ISTerre laboratory (Grenoble)
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. (C) 2017 Elsevier Ltd. All rights reserved.
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