Jemmali, Nejib, Souissi, Fouad, Carranza, Emmanuel John M., and Orgeval, Jean-Jacques (2013) Metal sources and timing of Pb-Zn deposits associated to salt dome cap rocks in northwest Tunisia: evidence from isotope (Pb,S) geochemistry. In: Proceedings of the 12th Biennial SGA Meeting (2) pp. 632-635. From: 12th Biennial SGA Meeting, 12-15 August 2013, Uppsala, Sweden.

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Abstract

The Pb-Zn ore deposits in the Oum Edeboua and Bou Grine areas (northern Tunisia) are hosted mainly by limestones in the contact zone between Triassic and Upper Cretaceous strata and by Upper Cretaceous limestones. The deposits occur as lenticular, stratiform, vein, dissemination and stockwork ore bodies consisting of sphalerite, galena, pyrite, chalcopyrite and sulfosalt (grey copper). Barite and calcite dominate the gangue.The ^34S of barite and celestite (12.7–15.0‰) at the Oum Edeboua (Guern Halfaya area) mine are consistent with the reduction of sulfates from Triassic evaporites within the study area (12.8<^34S<14.0‰). The ^34S values in base-metal sulfides from both study areas (2.6–9.5‰) and the presence of bacterial relics suggest involvement of bacterially-mediated sulfate reduction in the mineralizations. Pb isotope data are homogeneous with ^206Pb/^204Pb, ^207Pb/^204Pb and ^208Pb/^204Pb ratios of 18.723– 18.783, 15.667–15.685 and 38.806–38.889, respectively, which suggests a single source reservoir of Pb in the upper crust. The syn-diagenetic mineralization (F2) in the Bahloul Formation and the calculated ages from the Pb isotopic data suggest an Upper Cretaceous age for thePb-Zn deposits in the Oum Edeboua and Bou Grine mines.

Item ID:	41457
Item Type:	Conference Item (Research - E1)
ISBN:	978-91-7403-207-9
Keywords:	predictive mapping, Giyani, South Africa, GIS, remote sensing
Related URLs:	Organisation
Funders:	Tunisian Ministry of High Education and Scientific Research, Laboratory of Mineral Resources and Environment of the Faculty of Sciences of Tunis
Date Deposited:	26 Nov 2015 01:12
FoR Codes:	04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 100%
SEO Codes:	97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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