New tectono-sedimentary evidence constraining the timing of the positive tectonic inversion and the Eocene Atlasic phase in northern Tunisia: Implication for the North African paleo-margin evolution

Masrouhi, Amara; Ghanmi, Mohamed; Slama, Mohamed-Montassar Ben; Youssef, Mohamed Ben; Vila, Jean-Marie; Zargouni, Fouad

doi:10.1016/j.crte.2008.07.007

Cited by 73 publications

(44 citation statements)

References 29 publications

(53 reference statements)

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“…The tectonic frame defining the structure of Neogene basins in northern and eastern Tunisia is the result of the pre-Miocene tectonic inheritance, influenced by the Lutetian and Priabonian compressional phases (Castany, 1956;Raoult, 1974;Vila, 1980;Ben Ayed et al, 1983;Bédir et al, 1992;Ben Ayed, 1993;Melki et al, 1999;Bouaziz et al, 2002;El Euch et al, 2004;Ben Chelbi et al, 2006;Khomsi et al, 2006;Masrouhi et al, 2008; Frizon de Synthetic Neogene stratigraphic log of north-eastern Tunisia based on the previous outcrop studies (Burollet, 1951;Besème and Lajmi, 1981;Bel Haj Ali et al, 1998). Lamotte et al, 2009) and the Oligocene extensional stage (Ben Ayed, 1993;Melki, 1997;Yaïch et al, 2000;Talbi et al, 2008;Melki et al, 2010).…”

Section: Geological Settingmentioning

confidence: 96%

Structuring and evolution of Neogene transcurrent basins in the Tellian foreland domain, north-eastern Tunisia

Melki

Zouaghi

Harrab

et al. 2011

Journal of Geodynamics

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Section: Geological Settingmentioning

confidence: 96%

Structuring and evolution of Neogene transcurrent basins in the Tellian foreland domain, north-eastern Tunisia

Melki

Zouaghi

Harrab

et al. 2011

Journal of Geodynamics

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“…(Ben Ferjani et al, 1990;Zouari et al, 1990;Frizon de Lamotte et al, 2000;Bédir et al, 2001;Bouaziz et al, 2002;Guiraud et al, 2005;Said et al, 2011b;Gharbi et al, 2013). Following this first period of contraction, two major compressional events are evidenced in Tunisia: the Atlassic and the Alpine events Masrouhi et al, 2008). The Atlassic compressional tectonic event is characterized by a WNW-ESE to NW-SE shortening.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Recent spatial and temporal changes in the stress regime along the southern Tunisian Atlas front and the Gulf of Gabes: New insights from fault kinematics analysis and seismic profiles

et al. 2014

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Tectonic deformations in the Southern Atlassic Front of Tunisia (SAFT) and the Gulf of Gabes result from the Nubia-Eurasia convergence. This study, based on the inversion of geologically determined fault slip vectors, presents evidences for spatial and temporal changes in the stress state. Fault kinematics analyses reveal a temporal change in states of stress during the late Cenozoic. A paleostress (Miocene-Pliocene) state is characterized by a regional compressional tectonic regime with a mean N134±09°E trending horizontal maximum stress axis (σ 1 ). A modern (Quaternary to present-day) state of stress also corresponds to compressional tectonic regime with a regionally mean N05±10°E trending horizontal σ 1 . The SAFT corresponds to two distinct domains: a far-foreland Atlassic front related to contractional deformation associated with southward propagate thrusting, and eastward, the Gulf of Gabes characterized by normal component NW to WNW trending faults at the crustal margin scale probably related with a transtensional tectonic regime. We propose that the spatial and temporal changes in the stress during the Miocene-Pliocene and Quaternary may result from the geodynamic evolution of the Tunisian Atlas in relation to the rotation of Corsica-Sardinia blocks and the separation of the Sicilian continental lithosphere from the Ionian oceanic lithosphere.These temporal and spatial stress changes along the SAFT and the Gulf of Gabes are probably the engine behind the moderate seismicity, leading at the same time to a reactivation of the inherited major structures created during the evolution of the Southern Tethyan margin.

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“…The Maghrebides consist of (1) an Internal Zone, with basement nappes (Internal Massifs) derived from the Mesomediterranean plate, and a complex of flysch slices (or Flysch Zone) at their front, the two being thrust over (2) the Tellian nappes (or Tellian Zone), which in turn are thrust onto (3) the folded autochtonous units of the foreland (Tellian Atlas and Saharan Platform). The Tellian nappes represent the former passive margin of northern Africa, whereas the Tellian Atlas resulted from Eocene tectonic inversion of a Mesozoic rift system that formed parallel to the paleomargin (e.g., Masrouhi et al 2008). In the northern part of Tunisia, the Internal Zone boundary is located south of the Galite Islands (Mascle et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Tectonomagmatic Context of Sedex Pb–Zn and Polymetallic Ore Deposits of the Nappe Zone Northern Tunisia, and Comparisons with MVT Deposits in the Region

Decrée

Marignac

Abidi

et al. 2016

Mineral Deposits of North Africa

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The Nefza region (Nappe Zone, northern Tunisia) is known both as a Late Miocene magmatic province and a base-metal district. In this region, small, post-nappe, continental extensional basins (Sidi Driss and (Sedex). In addition to this mineralization, the Nappe zone contains other Pb-Zn and polymetallic deposits that show similarities both to the SHMS-Sedex and MVT deposits of the Dome and Graben zones, namely the "peri-diapiric" deposits of Jebel (Jb) el Hamra, Jalta, and Jebel Ghozlane. All of the Nappe Zone deposits share common characteristics, including: (1) age-the deposits formed between late collisional events (Late Tortonian) and inception of the Early Messinian extensional regime, in the context of the Alpine Maghrebide belt formation; (2) presence of pre-existing sulphates-these were likely the main source of sulphur for the sulphides; and (3) hydrothermal systems leading to their genesisthese testify to alternating influx of cold and warm fluids. The involvement of high temperature fluids are deduced from fluid inclusion studies (Th values of 140-240°C), whereas the presence of distinctive sphalerite textures (microspherules and colloform textures) and sulphur isotopic compositions demonstrate in situ bacterial sulphate reduction, and consequently deposition at temperatures below 80°C. These data constitute unifying characteristics for these mineralizations that are in contrast to the features of Pb-Zn(-fluorite) MVT deposits occurring in the Dome and Graben zones of Tunisia. The geodynamic context prevailing during the Late Miocene in the Nappe Zone is the underlying common factor that explains the diversity of ore deposits formed at that time in this region. Most deposits are located in the vicinity of shear zones and associated lineaments inherited from the Variscan orogeny. These deep structures were reactivated by transtensional processes during the Alpine orogeny and controlled post-collisional magmatism, circulation of hydrothermal fluids, and locations of related ore deposits and showings in the Nappe Zone.

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New tectono-sedimentary evidence constraining the timing of the positive tectonic inversion and the Eocene Atlasic phase in northern Tunisia: Implication for the North African paleo-margin evolution

Cited by 73 publications

References 29 publications

Structuring and evolution of Neogene transcurrent basins in the Tellian foreland domain, north-eastern Tunisia

Structuring and evolution of Neogene transcurrent basins in the Tellian foreland domain, north-eastern Tunisia

Recent spatial and temporal changes in the stress regime along the southern Tunisian Atlas front and the Gulf of Gabes: New insights from fault kinematics analysis and seismic profiles

Tectonomagmatic Context of Sedex Pb–Zn and Polymetallic Ore Deposits of the Nappe Zone Northern Tunisia, and Comparisons with MVT Deposits in the Region

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