The geomorphologic responses to hinge migration in the fault-related folds in the Southern Tunisian Atlas

Ahmadi, Riadh; Ouali, Jamel; Mercier, Éric; Mansy, Jean-Louis; Lanoë, Brigitte Van-Vliet; Launeau, Patrick; Rhekhiss, F.; Rafini, Silvain

doi:10.1016/j.jsg.2006.01.004

Cited by 84 publications

(43 citation statements)

References 23 publications

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“…It reflects the continuous and complex interaction between exogenous processes and endogenous tectonics that led to the formation of an orogen as well as its folds and associated faults (Deffontaines 1990;Deffontaines and Chorowicz 1991;Jackson and Leeder 1994;Jackson et al 1996;Burbank and Anderson 2001;Chen et al 2003;Ahmadi et al 2006;Delcaillau et al 2006;Ribolini and Spagnolo 2008). These structural features are often associated with a morphostructural growth and/or a lateral propagation into a tectonically active region (Jackson et al 1996;Delcaillau et al 1998;Champel et al 2002), with an obvious impact on the drainage network geometry which is highly influenced by the recent tectonics that the landfrom has experienced (Burbank and Anderson 2001;Delcaillau et al 2006;Silva et al 2008 and cited references).…”

Section: Introductionmentioning

confidence: 99%

Morphotectonic and Morphodynamic investigations revealed by isobase surfaces analysis and derived differential mapping using GIS, Teboursouk area, northern Tunisia

Slama

Deffontaines²,

Turki

2015

Earth Sci Inform

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Teboursouk area within the northern Tunisian Atlas presents a complex and heterogeneous geological framework leading to various geomorphic landforms among them there are numerous Triassic salt extrusions having an evident impact on the topographic configuration, shaping and dynamics. Landforms characterization of the study area, by morphostructural and morphodynamic mapping, was carried out using the isobase approach which is mainly based on the construction of topographic base-level surface from each channel order. GIS environment and spatial data analysis tools have been used to perform this procedure using 10 m-grid DEM and digitized drainage network at a semi-detailed scale (1: 50 000). The analysis included the creation of isobase maps of 2nd, 3rd and 4th-order channels. Grid calculations allowed the construction of (1) a combined surface from 2nd and 3rd order and (2) a differential map which represents the topographic residual between present day surface (original DEM) and isobase of 4th order. In fact, qualitative analysis of different isobase surfaces shows a good delimitation of most morphostructures and highlights a model of an atypical morphostructure concerning the Triassic extrusion of Jebel ech Cheid (JEC). Isoline anomalies and disturbances have indicated that major morphotectonic lineaments, interpreted as fractures, trend NE-SW to NNE-SSW adapting to the regional strike-slip fault system in response to NW-SE late Alpine transpressive tectonics. Several isoline inflexions were, however, well correlated with observed tectonic fractures and some of them are considered to be closely related to basement as the 4th-order analysis demonstrates. In contrast, neotectonic features, active landforms and lineaments were quantitatively described and localized based on the differential mapping approach.

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Section: Introductionmentioning

confidence: 99%

Morphotectonic and Morphodynamic investigations revealed by isobase surfaces analysis and derived differential mapping using GIS, Teboursouk area, northern Tunisia

Slama

Deffontaines²,

Turki

2015

Earth Sci Inform

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“…In fact, if shortening affected the basement areas with significant sediment load (Triassic and Jurassic that can reach the total thickness of 3000 to 4000 metres), the style and amount of deformation is moderated between the two neighbouring areas. Consequently, we suppose that the basement played a passive role in the transport of deformation along the décollement level in the Upper Trias sic to Lower Jurassic strata (Ahmadi et al 2006) and the overall deformation and shortening style can be characterized as thin-skinned tectonics.…”

Section: Synthesis and Discussionmentioning

confidence: 99%

Kinematic evolution and quantification of deformation in external orogenic zones: a case study from the Tunisian Atlas

Bensalem¹,

Amamria²,

Ghanmi³

et al. 2016

Geologica Carpathica

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Abstract:The quantification of deformation is one of the main objectives studied by geologists in order to control the evolution of tectonic structures and their kinematics during different tectonic phases. One of the most reliable methods of this theme is the direct calculation of quantity of deformation based on field data, while respecting several parameters such as the notion of tectonic inheritance and reactivation of pre-existing faults, or the relationship between the elongation and shortening axis with major faults. Thus, such a quantification of deformation in an area may explain the relations of thin-and thick-skinned tectonics during this deformation. The study of structural evolution of the Jebel Elkebar domain in the southern-central Tunisian Atlas permits us to quantify the deformation during the extensional phase by a direct calculation of the vertical throw along normal faults. This approach is verified by calculation of thickness of eroded strata in the uplifted compartment and of resedimented series, named the Kebar Formation, in the downthrown compartment. The obtained results confirm the importance of the Aptian-Albian extensional tectonic regime. The extent of deformation during the compressional phase, related to reactivation of pre-existing faults, is less than that of extensional phases; indeed the compressive reactivation did not compensate the vertical throw of normal faults. The geometry of the Elkebar fold is interpreted in terms of the "fault-related fold" model with a décollement level in the Triassic series. This permitted the partition of deformation between the basement and cover, so that the basement was allowed for a limited transport only, and the maximum of observed deformation was concentrated in the thin-skinned tectonics.

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“…The decolment uses various levels of the lithostratigraphic column. The major level in Gafsa basin is situated at the level of Triassic facies [4,6,[26][27][28] .…”

Section: Folding and Decolment Of Covermentioning

confidence: 99%

“…Many works focus on the study of the largest faults in North African craton proposes some model to interpret the deformation mode of structures in the limits of south atlassic front [3][4][5][6][7]. In this study the model of strain partitioning is the mechanism of genesis of major folds, this model is controlled by the properties of rocks, the tectonic inheritance and the role of preexistent faults.…”

Section: Introductionmentioning

confidence: 99%

Strain Partitioning Controlled by Oblique Ramp in Intracratonic Chains in Tunisia: Example of Gafsa Basin

Amamria¹,

Bensalem²,

Mercier³

et al. 2013

IJG

Self Cite

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The aim of this contribution is the interpretation of intracratonic chains in African plates, but it is important to verify some parameters such us the oblique convergence between Africa and Europa plates. Particularly in southern central of atlassic Tunisian belts, the slickenside examination of directional preexisting faults of N120 direction shows the coexistence of thrusting and strike-slip faults striation. In the limits of these faults principally in some tectonics lens we distinguish abnormal contacts with Triassic facies. The kinematic evolution of Gafsa basin resumed in the geometry of strike-slip faults connected in the thrusting system, this movement resulted from the oblique convergence on Ben Younes, Bou Ramli and Attig chains during compressive phases. This deformation style requires a shortening axis oblique to the NW-SE accidents (N120). The strain partitioning model verify the geometry of faults and equivalent evolution of folds and confirms the Triassic decollement level but without integrated of basement structures in the deformation. It permeated a passive transport of deformation observed in cover structure.

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The geomorphologic responses to hinge migration in the fault-related folds in the Southern Tunisian Atlas

Cited by 84 publications

References 23 publications

Morphotectonic and Morphodynamic investigations revealed by isobase surfaces analysis and derived differential mapping using GIS, Teboursouk area, northern Tunisia

Morphotectonic and Morphodynamic investigations revealed by isobase surfaces analysis and derived differential mapping using GIS, Teboursouk area, northern Tunisia

Kinematic evolution and quantification of deformation in external orogenic zones: a case study from the Tunisian Atlas

Strain Partitioning Controlled by Oblique Ramp in Intracratonic Chains in Tunisia: Example of Gafsa Basin

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