Sedimentological and stratigraphic constraints on Oligo–Miocene deposition in the Mogod Mountains, northern Tunisia: new insights for paleogeographic evolution of North Africa passive margin

Riahi, Sami; Soussi, Mohamed; Stow, Dorrik

doi:10.1007/s00531-020-01980-z

Cited by 9 publications

(5 citation statements)

References 45 publications

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“…It consists of an alternation of mudstones and quartzarenites with rhythmic character, up to 2500 m thick. The authors agree on the deep-water paleo-depositional environment of the Numidian domain and the turbiditic character of the sedimentation (e.g., Riahi et al, 2010Riahi et al, , 2015Riahi et al, and 2021. In northern Tunisia, it is a clay-sandstone formation that crops out over wide areas.…”

Section: 33-the Numidian Unitmentioning

confidence: 55%

“…The relation between the Numidian series, widely outcropping (Fig. 1) and broadly studied (Rouvier, 1985;Yaich et al, 2000;Talbi et al, 2008;Riahi et al, 2010Riahi et al, , 2015Riahi et al, , 2021Thomas et al, 2010;Guerrera et al, 2012;Belayouni et 3 al., 2013;among others), and its meso-cenozoic substratum led since a long-time to strong discussions, ending in various and often opposite interpretations. Lamotte et al 2000) highlighting the main structural domains: Atlas and Rif-Tell systems (a); geological map of Northern Tunisia (b) with the location of the studied area (Fig.…”

Section: Introduction and Problematicsmentioning

confidence: 99%

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Structural styles of the Tellian fold-and-thrust belt of Tunisia based on structural transects: Insights on the subsurface oil and gas pre-salt plays

et al. 2021

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We present several structural transects throughout the internal part of the Tunisian Tell focusing on some representative structures and domains. We used also an interpreted seismic crosssection and a 3-D structural view to highlight the styles within the Tellian Units in the Fernana-Adissa allochthon domain. The structural style is mainly represented by active roof-thrust and duplex structures affecting the Mesozoic-Cenozoic sequences belonging respectively to the Infra-Kasseb and Kasseb Units. The main decollement thrusting layer is located in the Triassic evaporites while the roof thrust corresponds to the Upper-Cretaceous or to the Paleocene shaly levels. The structural transects allow to view that the Numidian Flysch unit presents different structural configurations and relationships with its subsurface supporting units; (1) it rests on an apparent stratigraphic contact above the underlying Kasseb nappe or even over pre-existing Triassic salt structures while elsewhere (2) it is detached above these infra-Numidian units reworking an originally downlap contact. The area is also characterized by important halokinetic movements controlling the overall architecture of the Tell fold and thrust belt that

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Section: 33-the Numidian Unitmentioning

confidence: 55%

Section: Introduction and Problematicsmentioning

confidence: 99%

Structural styles of the Tellian fold-and-thrust belt of Tunisia based on structural transects: Insights on the subsurface oil and gas pre-salt plays

et al. 2021

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“…The Tell nappe belt in Tunisia is represented by the overthrusted Mesozoic to Tertiary Tellian nappes and overlying Numidian Flysch, together with the underlying Atlassic domain that deposited along the North Maghrebian passive margin during the Mesozoic and Cenozoic (Belayouni et al., 2013; Khomsi et al., 2009; Riahi et al., 2010; Riahi et al., 2021) (Figure 2). The Oligocene to early Miocene Numidian Flysch is interpreted to have formed over the previously shortened and eroded underlying Tellian sequence, in order to explain the stratigraphic omissions found along its basal contact (Khomsi et al., 2021; Khomsi et al., 2022).…”

Section: Geological Settingmentioning

confidence: 99%

“…Tectonic events in selected regions of the Western Mediterranean together with the magmatic and metamorphic evolution of Northeastern Algeria and Northern Tunisia. We include the stratigraphic sequence of the Atlas domain in Northern Tunisia (Triassic-Eocene from Melki et al (2012); Oligocene-Langhian from Riahi et al (2021); Post Langhian from Alyahyaoui and Zouari (2014)). Ages (blue numbers) of metamorphism and magmatism of Kabylies and N Tunisia and tectonic events over time of Western Mediterranean domains based on: 1.…”

Section: Figurementioning

confidence: 99%

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Metamorphic Domes in Northern Tunisia: Exhuming the Roots of Nappe Belts by Widespread Post‐Subduction Delamination in the Western Mediterranean

et al. 2023

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Cenozoic extension in the Western Mediterranean has been related to the dynamics of back-arc domains. Although, in most of its orogenic belts extension propagated into the fore-arc nappe domains. Here we revisit the structure, metamorphism and radiometric ages of the Tunisian Tell, where HP/LT rocks (350°C at 0.8 GPa), were exhumed by the sequential activity of extensional detachments after heating and decompression (410°C-440°C at 0.6-0.3 GPa) in a plate convergent setting. Normal faults thinning the Tunisian Tell detached at two different crustal levels. The shallower one cuts down into the Atlas Mesozoic sequence, involving Tellian Triassic evaporites in the hanging-wall forming halokinetic structures in the Mejerda basin late Miocene. The deeper-detachment bounds metamorphic domes formed by marbles and metapsammites from the Atlas domain. Illite crystallinity on Triassic rocks shows epizonal to anchizonal values, at deep and intermediate structural depths of the Tell-Atlas nappe belt, respectively. New U-Pb 49.78 ± 1.28 Ma rutile ages from Tellian metabasites, together with existing phlogopite 23-17 Ma K-Ar ages in Atlas marbles from the footwall of the deepest detachment, indicate a polymetamorphic evolution. The Tell rocks underthrusted the Kabylian flysch in the early Eocene. Further, early Miocene shortening thrusted the metabasites over lower-grade sediments, producing HP/LT metamorphism and ductile stretching at the base of the Atlas belt. The exhumation of midcrustal roots of Western Mediterranean nappe belts after tectonic shortening is a common feature related to tearing at the edges of the subduction systems and inboard delamination of their subcontinental lithospheric mantle.Plain Language Summary Mountain belts are formed by shortened sedimentary rocks. The Tell cordillera in Northern Tunisia is interpreted as a classic mountain belt developed through protracted shortening from the late Cretaceous until Present, formed by folded and overthrusted rocks, and intruded by salt bodies. However, we show here that conversely, some of the supposed salt bodies are formed by metamorphic rocks that were originally buried at depths of approximately 26 km. Moreover, the remaining salt structures in the Tunisian Tell formed in relation to the late-stage thinning and collapse of the mountain belt, as they intrude through extensional faults into late Miocene sediments. We characterize the temperature and pressure conditions reached by the metamorphic rocks and obtain a 49 Ma age of an early metamorphic event by radiometric dating of rutile. Metamorphic rocks where also exhumed in other Western Mediterranean mountain belts like the Betics, Rif, Algerian Tell after the main shortening stage. We relate this process to delamination, a deep mantle tectonic mechanism, which strips the nappe belt crustal domain from its underlying mantle root.BOOTH REA ET AL.

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The Upper Albian and Cenomanian–Turonian source rocks, and related oil seeps around Extrusive Triassic salt structures, Northern Tunisia: geochemical characterization and implication for petroleum system assessment

et al. 2022

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Sedimentological and stratigraphic constraints on Oligo–Miocene deposition in the Mogod Mountains, northern Tunisia: new insights for paleogeographic evolution of North Africa passive margin

Cited by 9 publications

References 45 publications

Structural styles of the Tellian fold-and-thrust belt of Tunisia based on structural transects: Insights on the subsurface oil and gas pre-salt plays

Structural styles of the Tellian fold-and-thrust belt of Tunisia based on structural transects: Insights on the subsurface oil and gas pre-salt plays

Metamorphic Domes in Northern Tunisia: Exhuming the Roots of Nappe Belts by Widespread Post‐Subduction Delamination in the Western Mediterranean

The Upper Albian and Cenomanian–Turonian source rocks, and related oil seeps around Extrusive Triassic salt structures, Northern Tunisia: geochemical characterization and implication for petroleum system assessment

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