On the origin and consequences of crustal-scale extension between Africa and Sicily since Late Miocene: insights from the Kaboudia area, western Pelagian Sea

Arab, Mohamed; Maherssi, Chokri El; Granjeon, Didier; Roure, François; Déverchère, Jacques; Cuilhe, L.; Hassaim, Mohamed; Mouchot, Nicolas; Doublet, S.; Khomsi, Sami

doi:10.1016/j.tecto.2020.228565

Cited by 13 publications

(7 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In some models, the Adria plate structure, located in the current Apenninic area, is characterized by the presence of a stiffer continental promontory in its central portion and of a thin continental lithosphere in the Umbria‐Marche region (Calcagnile & Panza, 1980; Geiss, 1987; Lucente & Speranza, 2001; Lucente et al., 2006; Maino et al., 2013; Miller & Piana Agostinetti, 2012; Panza et al., 2003). The African plate consists of a slightly thinner margin on its eastern side toward the Ionian ocean (Arab et al., 2020). The initial lithosphere temperature distribution has been determined according to the half‐space cooling equation (Turcotte & Schubert, 2014), while the underlying asthenosphere is characterized by a constant adiabatic temperature gradient of

0.5 normalK normalk m^{- 1}

.…”

Section: Methodsmentioning

confidence: 99%

The Role of Adria Plate Lithospheric Structures on the Recent Dynamics of the Central Mediterranean Region

2021

View full text Add to dashboard Cite

In the geodynamic context of the slow convergence between the African and Eurasian plates, the Central Mediterranean region has been involved in a complex subduction process that over the last 30 Myr was characterized by the rapid retreat of the Ionian trench, the opening of back-arc extensional basins (i.e., Liguro-Provençal, Algerian, and Tyrrhenian basins) and episodes of slab lateral tearing, segmentation,

show abstract

0.5 normalK normalk m^{- 1}

.…”

Section: Methodsmentioning

confidence: 99%

The Role of Adria Plate Lithospheric Structures on the Recent Dynamics of the Central Mediterranean Region

2021

View full text Add to dashboard Cite

show abstract

“…The exhumation of midcrustal domes is further supported by seismic-refraction EGT'85 North-South line that shows the high-velocity crustal material (6.05 km/s) reaching the surface at the Hairech ridge (Research Group for Lithospheric Structure in Tunisia, 1992) (Figure 13e). The late Miocene extension in Northern Tunisia propagated southeastwards during the Pliocene to Quaternary, affecting large regions of Central Tunisia, the Sicilian Channel and the Pelagian domain offshore (Arab et al, 2020;Belguith et al, 2011Belguith et al, , 2013Civile et al, 2010). This crustal thinning probably initiated in the middle Miocene concomitant to oceanic spreading of the easternmost Algerian basin (Haidar et al, 2022) (Figure 14).…”

Section: Extensional Exhumation In Northern Tunisiamentioning

confidence: 99%

“…The main fault system accommodating this late Pliocene to Present-day convergence across Northern Tunisia is the Alia-Thibar dextral reverse fault zone (Gaidi et al, 2020). Extension propagated southward, affecting large areas of central Tunisia and the Pelagian platform between the Messinian-Zanclean and Quaternary (Arab et al, 2020;Belguith et al, 2011Belguith et al, , 2013Bouaziz et al, 2002;Dhifaoui et al, 2021;Saïd et al, 2011).…”

Section: Figurementioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

“…As a whole, the Tell fold-and-thrust belt corresponds to a tectonic wedge (Fig. 1) built from a long and complex evolution at the North African margin of Maghrebian sedimentary basins (Frizon de Lamotte et al, 2000 and2009;Granath and Casero, 2004;Roure et al, 2012;Khomsi et al, 2016 andArab et al, 2020). Several tectonic pulses were recorded over the Cenozoic times, during the NW-dipping subduction of the Ligurian-Tethys ocean segment, linked to the North African margin, underneath the European margin (Roure et al, 1990 andJolivet et al, 1999;Vergés and Sàbat, 1999;Hippolyte et al, 1994;Roca et al, 2004;Finetti et al, 2005;Guerrera, 2014;Guerrera et al 2019).The subsequent SE-directed roll back of this subduction during the Oligocene-Langhian caused the retreat of the Tethys slab, the formation of the Algerian Basin behind, and the collision of the AlKaPeCa domain against the deep margin of the north Atlassic Basin in the Langhian (Roca et al, 2004;Roure et al, 2012;Van Hinsbergen et al, 2014).…”

Section: Northern Africa Tell and Atlas Fold And Thrust Belts In Thei...mentioning

confidence: 99%

Hinterland and foreland structures of the eastern Maghreb Tell and Atlas thrust belts: tectonic controlling factors, pending questions, and oil/gas exploration potential of the Pre-Triassic traps

Khomsi

Roure

Vergés³

2022

Arab J Geosci

Self Cite

View full text Add to dashboard Cite

This special issue of the AJGS entitled Geology of North Africa and Mediterranean regions is a follow-up of the AGIC (Atlas Georesources International conferences) organized in 2017 by the Georesources Laboratory and CERTE, Tunis, University of Carthage. This event was a major occasion for geoscientists from Arabian, Maghrebian, and European countries to present their recent findings and research results in the characterization of different georesources in North Africa, the Mediterranean, and surrounding areas, thus also including the Arabian plate.This thematic issue is composed of 33 papers covering a wide spectrum of topics and fields, from architecture and thermicity of sedimentary basins to structural evolution, oil/ gas exploration, fractured reservoirs, water resources, aquifer characterization, and applied geophysics.

show abstract

On the origin and consequences of crustal-scale extension between Africa and Sicily since Late Miocene: insights from the Kaboudia area, western Pelagian Sea

Cited by 13 publications

References 54 publications

The Role of Adria Plate Lithospheric Structures on the Recent Dynamics of the Central Mediterranean Region

The Role of Adria Plate Lithospheric Structures on the Recent Dynamics of the Central Mediterranean Region

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

Hinterland and foreland structures of the eastern Maghreb Tell and Atlas thrust belts: tectonic controlling factors, pending questions, and oil/gas exploration potential of the Pre-Triassic traps

Contact Info

Product

Resources

About