ABSTRACT In Central Tunisia, the Jebel Kohl Sr–(Pb–Zn) salt‐related mineralization is located at the southern edge of the North–South Axis within the Maknassy‐Mezzouna Triassic corridor. The mineralization, comprising celestine, galena and late‐stage schalenblende, is mainly hosted in N–S to N40°E–trending fractures and faults in the sandy marl and limestone of the Abiod Formation (Campanian‐Maastrichtian) and in carbonate breccias of the Zebbag Formation (Albian‐Turonian). These structures reflect Atlasic‐driven stress and halokinetic activity that guided metal‐bearing fluids. The paragenesis—celestine (Clt1 → Clt2) → galena → schalenblende—records a multi‐stage hydrothermal evolution with episodic fluid influx and redox fluctuations. Colloform textures and replacement features indicate rapid precipitation linked to fluid mixing between basinal brines and cooler fluids, as well as wall‐rock interaction. NW‐SE lineaments localized mineralization by facilitating Triassic evaporite rise and channeling metal‐bearing brines. Reactivated Mesozoic faults during compressional phases promoted fracture networks around diapirs, enhancing fluid circulation. Although halokinesis has been long‐lived in the region, the structural style, mineral assemblage, and deformation pattern are most consistent with ore emplacement during Eocene–Miocene Alpine compressional phases, when major NW–SE faults were reactivated and diapiric uplift intensified. Despite its peridiapiric setting, the stratabound geometry, low‐temperature assemblage, and strong structural control align with Mississippi Valley‐Type (MVT) characteristics. Jebel Kohl deposit illustrates how salt tectonics and orogenic deformation interact to focus Sr–(Pb–Zn) mineralization in diapiric terrains, highlighting a broader metallogenic potential of Central Tunisia.
Sebai et al. (Thu,) studied this question.
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