The ore genesis of the Jebel Mecella and Sidi Taya F–Ba (Zn–Pb) Mississippi Valley-type deposits, Fluorite Zaghouan Province, NE Tunisia, in relation to Alpine orogeny: constraints from geological, sulfur, and lead isotope studies

Jemmali, Nejib, Rddad, Larbi, Souissi, Fouad, and Carranza, Emmanuel John M. (2019) The ore genesis of the Jebel Mecella and Sidi Taya F–Ba (Zn–Pb) Mississippi Valley-type deposits, Fluorite Zaghouan Province, NE Tunisia, in relation to Alpine orogeny: constraints from geological, sulfur, and lead isotope studies. Comptes Rendus Geoscience, 351 (4). pp. 312-320.

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Abstract

Jebel Mecella and Sidi Taya F–(Ba–Pb–Zn) deposits are located within the Fluorite Zaghouan Province (NE Tunisia). The mineralization occurs along the unconformity surface between the Jurassic limestones and Upper Cretaceous rocks. The mineralization consists mainly of fluorite, barite, sphalerite, and galena. The δ³⁴S values of barite at Jebel Mecella (14.8–15.4‰) and at Sidi Taya (21.6–22.2‰) closely match those of the Triassic evaporites and Messinian seawater, respectively. The range of δ³⁴S values of galena and sphalerite in both deposits (−6.9 to +2.4‰) suggests the involvement of thermochemical sulfate reduction and possibly organically-bound sulfur in the generation of sulfur. Lead isotope data with ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb, and ²⁰⁸Pb/²⁰⁴Pb ratios of 18.893–18.903, 15.684–15.699, and 38.850–38.880, respectively suggests a single homogeneous source reservoir of Paleozoic age and/or the homogenization of the Paleozoic–Cretaceous multireservoir-derived fluids along their long migration paths to the loci of deposition during the Alpine orogeny.

Item ID: 61857
Item Type: Article (Research - C1)
ISSN: 1778-7025
Keywords: Fluorite Zaghouan province, F–Ba (Zn–Pb), Jebel Mecella, MVT, Pb isotope, S isotope, Sidi Taya
Copyright Information: © 2019 Académie des sciences.
Additional Information:

This article is available Open Access via the publisher's website.

Date Deposited: 26 May 2020 19:06
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
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