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Is the Mejerda Wedge-Top Basin of Northern Tunisia a Consequence of Basal Friction Change? a Theoretical and Experimental Approach

  • Mannoubi KhelilEmail author
  • Pauline Souloumiac
  • Dominique Frizon de Lamotte
  • Sami Khomsi
  • Bertrand Maillot
  • Seifeddine Gaidi
  • Mourad Bedir
  • Fouad Zargouni
Conference paper
Part of the Advances in Science, Technology & Innovation book series (ASTI)

Abstract

In Northern Tunisia, the extensional Mejerda basin is developed over a major compressional boundary between the Tell fold-thrust belt to the north and the Atlas intra-continental system to the south. The abundance of Triassic salt structures in northern Atlas and under the Mejerda basin suggests a lateral change of the friction along the basal detachment. Such abrupt transition plays a significant role in the structural styles of the studied region and especially in the Mejerda basin. Therefore, we have developed prototypes with a basal frictional transition to study, through numerical and physical simulations, wedge deformation style. Accordingly, the one step results of all run numerical tests depict normal faults localized at this basal transition. In addition, the physical models in sandbox allow us to verify the mechanical results and to observe more deformation steps, in 2D and in 3D views. As a result, we observed via the sandbox experiments extensional features such as grabens. Finally, we highlight that compression can lead to build an extensional basin at the top of a thrust wedge as expression of basal friction change and we interpret the Mejerda basin accordingly.

Keywords

Basal friction transition Numerical simulations Analogue modelling Sandbox experiments Mejerda basin Wedge-top basin 

References

  1. 1.
    Wildi, W.: La chaîne tello-rifaine (Algérie, Maroc, Tunisie): structure, stratigraphie et évolution du Trias au Miocène. Rev. Geol. Dyn. Geog. Phys. Paris 24(3), 201 (1983)Google Scholar
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    Krabbenhøft, K., Lyamin, A.V.: Optum G2. Optum Computational Engineering. www.optumce.com (2014)
  3. 3.
    Cubas, N., Avouac, J.P., Souloumiac, P., Leroy, Y.: Megathrust friction determined from mechanical analysis of the forearc in the Maule earthquake area. Earth Planet. Sci. Lett. 381, 92–103 (2013)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Mannoubi Khelil
    • 1
    • 4
    Email author
  • Pauline Souloumiac
    • 2
  • Dominique Frizon de Lamotte
    • 2
  • Sami Khomsi
    • 3
  • Bertrand Maillot
    • 2
  • Seifeddine Gaidi
    • 1
  • Mourad Bedir
    • 4
  • Fouad Zargouni
    • 1
  1. 1.Tunis El Manar UniversityTunisTunisia
  2. 2.Département Géosciences et Environnement, Université de Cergy-PontoiseCergy-PontoiseFrance
  3. 3.Department of Petroleum Geology, Faculty of Earth SciencesKing Abdulaziz UniversityJeddahSaudi Arabia
  4. 4.Laboratoire GeoressourcesCERTESolimanTunisia

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