Triassic salt sheets of Mezzouna, Central Tunisia: New comments on Late Cretaceous halokinesis and geodynamic evolution of the northern African margin

Dhahri, Ferid; Boukadi, Noureddine

doi:10.1016/j.jafrearsci.2017.01.016

Cited by 19 publications

(12 citation statements)

References 42 publications

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“…This differentiation is associated with volcanic and salt structures, all of them characterized by a passive margin context (e.g. Mattoussi Kort et al, 2009;Masrouhi et al, 2013;Jaillard et al, 2017;Dhahri and Boukadi, 2017).…”

Section: Structural Frameworkmentioning

confidence: 99%

Interconnection salt diapir–allochthonous salt sheet in northern Tunisia: The Lansarine–Baoula case study

Amri

Naji

Masrouhi

et al. 2020

Journal of African Earth Sciences

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Structural Frameworkmentioning

confidence: 99%

Interconnection salt diapir–allochthonous salt sheet in northern Tunisia: The Lansarine–Baoula case study

Amri

Naji

Masrouhi

et al. 2020

Journal of African Earth Sciences

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“…Early Triassic salt basins were shaped, overall Tunisia, during the earlier stage of this evolution (Soussi et al, 2017). The extensional setting prevailed during Jurassic and Early Cretaceous (Boughdiri et al, 2007;Souquet et al, 1997;Masrouhi and Koyi, 2012;Dhahri and Boukadi, 2017), led to the opening of Central Atlantic. Late reviews (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

Temporal and spatial changes of the submarine Cretaceous paleoslope in Northern Tunisia, inferred from slump folds analysis

Naji

Gharbi

Amri

et al. 2018

Proceedings of the Geologists' Association

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This paper presents the first comprehensive, non-exhaustive, study of the genetic relationship between slump folds and the synsedimentary paleoslope during Cretaceous time in northern Tunisia. Slump folds occur mainly in the Cretaceous marl-dominated lithofacies, which exposes numerous slump folds structures. In addition, fault kinematic analysis is conducted to define the paleostress fields and the stress states characterizing the Cretaceous extension that triggers soft-sediment deformation and slumping. The MAM and the APM methods are used to deduce the paleoslope in several localities. The calculated values of paleoslope trend derived from MAM and APM methods precise the variation of the paleoslope trend during Cretaceous times in northern Tunisia. This paleoslope is ~NW-dipping during Berriasian, ~SSW-dipping during Valanginian, ~NW-dipping during the Barremian and ~N-to ~NNE or ~S-to ~SSW-dipping during Aptian-Albian period. The results of the back-tilted fault diagram show a ~North to ~Northeast-trending tectonics extension. The back-tilting of Cenomanian slump axis and poles of axial planes (MAM and APM methods) give close results with ~Southward or ~Northwarddipping paleoslope. The restored fault diagrams show ~North to ~Northeast-trending extension during Cenomanian times. Coniacian-Santonian marls deposits seal all the gravity-driven deformation structures. North Tunisian area exposes evidences for abundant soft-sediment deformation and slumping atop a northward facing submarine slope, which was probably dominant from the Early Cretaceous to Santonian with ~North-South tectonic extension related to the Southern Tethyan rifted continental margin evolution.

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“…The Triassic outcrops, identified in Jebel Ben Younes and Jebel Hdifa along the Gafsa fault trace, are thought to demonstrate shear movements accompanied by Triassic intrusions. The onset of the halokinesis along open major fractures can be related to the Jurassic-Late Cretaceous extensional regime leading to the development of large-scale strike-slip fault such as those of Gafsa fault, Meknassy-Mezzouna corridor or at large scale, the Sirt rift (Dhahri and Boukadi 2017). This presumably saccadic halokinesis seems to have been aborted when these fractures were closed subsequently to transpressional regimes.…”

Section: Discussionmentioning

confidence: 99%

“…This event is shown in the seismic line of figure 10 by the deformed Jurassic and Lower Cretaceous series topped by the Austrian unconformity. NE-SW to ENE-WSW trending extension directions dominated during Late Cretaceous (Bédir 1995;Bédir et al 2001;Zouaghi 2008;Dhahri and Boukadi 2017), subsequently to the Aptian dextral slip of the Gibraltar-Messine transform fault engendering strike-slip and normal faults along NE-SW and N-S accidents, which led to the extension of the Tunisian margin (Martinez et al 1991). From the south to the north, sedimentation occurred along a gentle slope and evolved respectively from littoral to shallow marine facies near central Tunisia (figure 12c).…”

Section: Discussionmentioning

confidence: 99%

“…Gravity data modeling showed that Paleozoic series are ∼2500 m thick and rest at ∼7000 m depth (Hlaiem 1998). In central Tunisia, Triassic series mainly outcrops along the Mezzouna corridor and N-S axis chain (Burollet 1956;Boukadi et al 1992;Boukadi and Bédir 1996;Azaïez et al 2007;Dhahri et al 2015;Dhahri and Boukadi 2017). They consist of mixed gypsum, clay, silt and dolomite, well documented northward in the Rheouis Formation (Burollet 1956;Soussi et al 1997Soussi et al , 2001Courel et al 2000).…”

Section: Stratigraphic Overviewmentioning

confidence: 99%

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The role of E–W basement faults in the Mesozoic geodynamic evolution of the Gafsa and Chotts basins, south-central Tunisia

et al. 2017

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The Gafsa and Chotts intracratonic basins in south-central Tunisia are transitional zones between the Atlasic domain to the north and the Saharan platform to the south. The principal aim of this paper is to unravel the geodynamic evolution of these basins following an integrated approach including seismic, well log and gravity data. These data are used to highlight the tectonic control on the deposition of Jurassic and Lower Cretaceous series and to discuss the role of the main faults that controlled the basin architecture and Cretaceous-Tertiary inversion. The horizontal gravity gradient map of the study area highlights the pattern of discontinuities within the two basins and reveals the presence of deep E-W basement faults. Primary attention is given to the role played by the E-W faults system and that of the NW-SE Gafsa fault which was previously considered active since the Jurassic. Facies and thickness analyses based on new seismic interpretation and well data suggest that the E-W-oriented faults controlled the subsidence distribution especially during the Jurassic. The NW-SE faults seem to be key structures that controlled the basins paleogeography during Late Cretaceous-Cenozoic time. The upper Triassic evaporite bodies, which locally outline the main NW-SE Gafsa fault, are regarded as intrusive salt bodies rather than early diapiric extrusions as previously interpreted since they are rare and occurred only along main strike-slip faults. In addition, seismic lines show that Triassic rocks are deep and do not exhibit true diapiric features.

show abstract

Triassic salt sheets of Mezzouna, Central Tunisia: New comments on Late Cretaceous halokinesis and geodynamic evolution of the northern African margin

Cited by 19 publications

References 42 publications

Interconnection salt diapir–allochthonous salt sheet in northern Tunisia: The Lansarine–Baoula case study

Interconnection salt diapir–allochthonous salt sheet in northern Tunisia: The Lansarine–Baoula case study

Temporal and spatial changes of the submarine Cretaceous paleoslope in Northern Tunisia, inferred from slump folds analysis

The role of E–W basement faults in the Mesozoic geodynamic evolution of the Gafsa and Chotts basins, south-central Tunisia

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