Geochemical constraints on the genesis of the Pb–Zn deposit of Jalta (northern Tunisia): Implications for timing of mineralization, sources of metals and relationship to the Neogene volcanism

Jemmali, Nejib; Souissi, Fouad; Carranza, Emmanuel John M.; Vennemann, Torsten; Bogdanov, Kamen

doi:10.1016/j.chemer.2014.01.002

Cited by 14 publications

(19 citation statements)

References 46 publications

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“…Peridiapiric deposits also occur in the Nappe Zone (Jebel el Hamra, Abidi et al 2010; Jb Ghozlane and Jalta, Jemmali et al 2011bJemmali et al , 2013bJemmali et al , 2014. However, this zone is better known for containing a large variety of polymetallic deposits, among which several are present in the Nefza district.…”

Section: Introductionmentioning

confidence: 91%

“…1), other Pb-Zn deposits thought to be Upper Miocene in age are present at Jalta and Jebel Ghozlane (Jemmali 2011;Jemmali et al 2011bJemmali et al , 2012Jemmali et al , 2014. The Jalta mine, where Pb-Zn mineralization is associated with post-nappe Miocene strata (Jemmali et al 2014), has produced *75,000 t of ore grading 59 % Pb. The enclosing basin is delimited by two major faults: the NE-SW Ras El Korane-Thibar fault in the northwest, and a N-S fault on the eastern side.…”

Section: The Jalta and Jebel Ghozlane Pb-zn Depositsmentioning

confidence: 97%

“…At El Arja 370 t Hg were extracted from 1952 to 1975, with Hg grades of 0.08 to 1.5 wt% (Gharbi 1977). The Jalta mine, where the Pb-Zn mineralization is associated with the post-nappe Miocene series (Jemmali et al 2014), has produced *75,000 t of ore grading 59 % Pb. At Jebel Ghozlane, the mine produced *6,680 t of Pb and 53,000 t of Zn.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 91%

Section: The Jalta and Jebel Ghozlane Pb-zn Depositsmentioning

confidence: 97%

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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 Pb-Zn mineralization in the Jalta deposit ( [1,10]; Figure 2) is located mainly near and along the contact of the Triassic rocks with the Miocene series. The mineralization mainly hosted by brecciated Triassic dolostones is composed of galena, barite and minor pyrite, jordanite and sphalerite occurring as veins, stockworks, disseminated, karstic and breccias cement [10].…”

Section: Jaltamentioning

confidence: 99%

“…The current study represents a synthesis of Pb isotope data collected from papers published by Jemmali et al [1,[8][9][10] of Jalta, Jebel Ghozlane, Jebel Hallouf, Oued Maden and Fedj Hassene deposits in the Nappes zone ( Figure 1) and comparison to previously published Pb isotope ratios of Neogene igneous rocks and sedimentary cover rocks from the same zone. This will help constrain the source(s) of metals and the possible age of mineralization.…”

Section: Introductionmentioning

confidence: 99%

Lead Isotopes as Tracers of Metal Sources and Timing of the Carbonate-Hosted Pb-Zn Deposits in the Nappes Zone, Northern Tunisia

Jemmali¹,

Souissi²

2018

Contributions to Mineralization

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The polymetallic deposits in the Nappes zone, Northern Tunisia occur in the contact between Triassic-Miocene/Eocene carbonate rocks and in the Upper Cretaceous limestones. They can be divided into two groups: one is Pb-Zn mineralization with Hg and As in fractures with local intrusions of Neogene volcanics (e.g., Fej Hassene, Oued Maden), and the second is stratabound and karst Pb-Zn mineralization with arsenic and antimony hosted in the continental Neogene strata or situated immediately below them (Aïn Allega, Sidi Embarek, Jebel Hallouf-Sidi Bou Aouane, Bazina, Jalta and Jebel Ghozlane). Pb-isotopic compositions of galenas display a homogeneous Pb isotope signature. Generally, Pb isotope ratios on ores from the Jalta, Jebel Ghozlane, Jebel Hallouf, Oued Maden and Fedj Hassene plot between samples of the Late Miocene igneous rocks and the sedimentary country rocks of the Nefza area and between the upper crust and orogen curves. This intermediate position may imply potential mixing between end-member sources. Because the Pb-Zn mineralization is fault-controlled and spatially associated with the post-nappe Miocene series and the calculated model age is about 10.86 Ma, one is led to argue that the mineralization in the Nappes zone deposits occurred during the last paroxysmal phase of the Alpine folding (i.e., Miocene age).

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Environmental mineralogy and geochemistry of Pb–Zn mine wastes, Northern Tunisia

Tlil

Souissi²,

Souissi

et al. 2016

Rend. Fis. Acc. Lincei

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Geochemical constraints on the genesis of the Pb–Zn deposit of Jalta (northern Tunisia): Implications for timing of mineralization, sources of metals and relationship to the Neogene volcanism

Cited by 14 publications

References 46 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

Lead Isotopes as Tracers of Metal Sources and Timing of the Carbonate-Hosted Pb-Zn Deposits in the Nappes Zone, Northern Tunisia

Environmental mineralogy and geochemistry of Pb–Zn mine wastes, Northern Tunisia

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