首页|Geochemistry,mineral paragenesis and geothermal conditions of oreforming fluids from the Ain El Bey Cu-Fe deposit:potential occurrence of native gold and precious metal traces(North African orogenic belt,Northern Tunisia)

Geochemistry,mineral paragenesis and geothermal conditions of oreforming fluids from the Ain El Bey Cu-Fe deposit:potential occurrence of native gold and precious metal traces(North African orogenic belt,Northern Tunisia)

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The Ain El Bey abandoned mine,in North-West Tunisia,fits into the geodynamic context of the European and African plate boundary.Ore deposit corresponds to veins and breccia of multiphase Cu-Fe-rich mineralization related to various hydrothermal fluid circulations.Petro-mineralogical studies indicate a rich mineral paragenesis with a minimum of seven mineralization phases and,at least,six pyrite generations.As is also the case for galena and native silver,native gold is observed for the first time as inclusion in quartz which opens up,thus,new perspec-tives for prospecting and evaluating the potential for noble metals associated with the mineralization.Scanning Elec-tron Microscope—Energy Dispersive Spectroscopy and Transmission electron microscopy analyses show,in addition,a large incorporation of trace elements,including Ag and Au,in mineral structures such as fahlores(tetra-hedrite-tennantite)and chalcopyrite ones.The mineral/mineral associations,used as geothermometers,gave esti-mated temperatures for the mineralizing fluids varying from 254 to 330 ℃ for phase Ⅲ,from 254 to 350 ℃ for phase Ⅳ,and from 200 to 300 ℃ for phases Ⅴ and Ⅵ.The seventh and last identified mineralization phase,marked by a deposit of native gold,reflects a drop in the mineralizing fluid's temperature(＜200 ℃)compatible with boiling conditions.Such results open up perspectives for the development of precious metal research and the revaluation of the Cu-Fe ore deposit at the Ain El Bey abandoned mine,as well as at the surrounding areas fitting in the geodynamic framework of the Africa-Europe plate boundary.

Ore-forming fluidsMineral geochemistryMineral geothermometersNative silver-goldAin El Bey Ore depositNorth Tunisia

Rania Ben Aissa、Wiem Ben Aissa、Said Tlig、Lassaâd Ben Aissa、Abdessalem Ben Haj Amara

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Faculty of Science of Bizerte,University of Carthage,7021 Zarzouna,Bizerte,Tunisia

Laboratoire de Recherche Ressources,Matériaux et Ecosystèmes,University of Carthage,7021 Zarzouna,Bizerte,Tunisia

Department of Geology,University Claude Bernard Lyon 1,69622 Villeurbanne,France

Faculty of Science of Tunis,University of Tunis-El Manar,Rommana,1068 Tunis,Tunisia

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2024

10.1007/s11631-023-00657-z

地球化学学报(英文版)
中国科学院地球化学研究所

地球化学学报(英文版)

EI
影响因子：0.33
ISSN：2096-0956
年,卷(期)：2024.43(2)