The ore genesis of the Jebel Mecella and Sidi Taya FBa (ZnPb) Mississippi Valley-type deposits, Fluorite Zaghouan Province, NE Tunisia, in relation to Alpine orogeny: Constraints from geological, sulfur, and lead isotope studies

IF 2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Comptes Rendus Geoscience Pub Date : 2019-04-01 DOI:10.1016/j.crte.2018.11.006

Nejib Jemmali , Larbi Rddad , Fouad Souissi , Emmanuel John M. Carranza

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引用次数: 5

Abstract

Jebel Mecella and Sidi Taya F–(BaPbZn) 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.

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突尼斯Zaghouan省Jebel Mecella和Sidi Taya FBa (ZnPb)密西西比河谷型矿床与高山造山作用的关系:来自地质、硫和铅同位素研究的约束

Jebel Mecella和Sidi Taya F - (BaPbZn)矿床位于突尼斯东北部Zaghouan省萤石区内。成矿作用发生在侏罗纪灰岩与上白垩统岩石的不整合面。成矿主要为萤石、重晶石、闪锌矿和方铅矿。Jebel Mecella(14.8 ~ 15.4‰)和Sidi Taya(21.6 ~ 22.2‰)重晶石的δ34S值与三叠纪蒸发岩和墨西尼亚海水的δ34S值非常接近。方铅矿和闪锌矿的δ34S值变化范围(−6.9 ~ +2.4‰)表明热化学硫酸盐还原作用和有机结合硫可能参与了硫的生成。206Pb/204Pb、207Pb/204Pb和208Pb/204Pb比值分别为18.893 ~ 18.903、15.684 ~ 15.699和38.850 ~ 38.880，表明该区存在单一的古生代均质源储层和/或古生代-白垩纪多储层衍生流体在高寒造山时期沿其长迁移路径迁移至沉积地点的均匀化特征。

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来源期刊

Comptes Rendus Geoscience 地学-地球科学综合

CiteScore

2.80

自引率

14.30%

发文量

审稿时长

5.9 weeks

期刊介绍： Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.