L'Eocene moyen dans la region de Teboursouk (zone des diapirs, Tunisie septentrionale); implications paleogeographiques et structurales

Perthuisot, V.

doi:10.2113/gssgfbull.s7-xvi.3.319

Cited by 6 publications

(16 citation statements)

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“…The cordierite-bearing rhyodacite dome at Ain Deflaia has been variously dated at 12.3 ± 0.5 and 8.5 Ma (Bellon 1976;Rouvier 1977). However, because pyroclastic deposits related to the Ain Deflaia massif (Laridhi-Ouazaa 1988, 1989, 1996 fill the Zouaraa basin, the latter Late Tortonian age is favoured. In the same basin, transitional basalt sills outcropping at Mokta el-Hadid (Fig.…”

Section: Miocene Tectonomagmaticmentioning

confidence: 99%

“…The alteration and mineralization are both related to very high-temperature fluid circulations (≥500-550°C ; Talbi et al 1999). The major breccia-forming event (dated at 9.2 ± 0.25 Ma via K-Ar on K-feldspar) is coeval with mineralization and with emplacement of the Oued Belif rhyodacite intrusion, which could be related to a phreato-magmatic event (Mauduit 1978;Perthuisot 1978;Decrée et al 2013).…”

Section: Polymetallic Mineralization In the Nefza Mining Districtmentioning

confidence: 99%

“…The Triassic rocks in the extruded (diapiric) core of the antiform are representative of the "Transition Zone Formation" (TZF) that hosts Pb-Zn mineralization at a regional scale (Orgeval et al 1986;Bouhlel 1993;Bouhlel et al 2007). The TZF rocks within the Dome Zone diapirs are known to have formed during the first stage of halokinesis (Perthuisot 1978), which is Cretaceous in age. The "post-nappe stage of halokinesis," which is linked to Tortonian compression (Khomsi et al 2009), corresponds here to reactivation of an older diapiric structure, rooted in the Triassic.…”

Section: Geological Settingmentioning

confidence: 99%

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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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Section: Miocene Tectonomagmaticmentioning

confidence: 99%

Section: Polymetallic Mineralization In the Nefza Mining Districtmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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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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“…In relation to Africa-Europe collision, northern Tunisia underwent several compressional tectonic events. A first episode, recently attributed to the Middle Eocene (Perthuisot 1974, Adil 1993, is still a matter of discussion; however, a consensus is reached on the occurrence of three major phases dated as Middle Miocene, Late Miocene, and earliest Pliocene. The most important one, referred to as the "Atlasic phase", was responsible for important folding and reactivated diapiric movement of Triassic deposits also interpreted as salt glaciers by some authors (Vila 1995).…”

Section: Geological and Palaeogeographical Contextmentioning

confidence: 99%

Gravity Data from the Teboursouk Area (“Diapirs Zone”, Northern Tunisia): Characterization of Deep Structures and Updated Tectonic Pattern

et al. 2016

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Located between eastern segments of the Atlas and Tell-Rif orogenic belts, the "Dome zone" of northern Tunisia is characterized by the juxtaposition of various structures that mainly controlled the long geodynamic history of this part of the south-Tethyan Margin. To better understand the organization and deep extension of these structures, gravity data from the Teboursouk key area are proposed. These data include the plotting of Bouguer anomaly map and related parameters such as vertical and horizontal gradients, upward continuation and Euler solution. Compared to geological and structural maps available, they allow the identification of new deep structures and greater precision regarding the characteristics and organization of known ones; consequently, an updated structural pattern is proposed.

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“…Nummulitic limestones, Eocene (Ypresian-Lutetian) in age, belonging to the El Garia Fm (Metlaoui Group) (Fournié , 1978;Moody and Grant, 1989;Perthuisot, 1974Perthuisot, , 1979Tlig et al, 2010) (Fig. 1 and Fig.…”

Section: Introductionmentioning

confidence: 99%

The building stone of the Roman city of Dougga (Tunisia): Provenance, petrophysical characterisation and durability

Zoghlami

Martín‐Martín

Gómez‐Gras

et al. 2017

Comptes Rendus. Géoscience

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L'Eocene moyen dans la region de Teboursouk (zone des diapirs, Tunisie septentrionale); implications paleogeographiques et structurales

Cited by 6 publications

References 0 publications

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

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

Gravity Data from the Teboursouk Area (“Diapirs Zone”, Northern Tunisia): Characterization of Deep Structures and Updated Tectonic Pattern

The building stone of the Roman city of Dougga (Tunisia): Provenance, petrophysical characterisation and durability

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