ABSTRACT
Dumbeir complex is regarded as anorogenic peralkaline syenite complex injected in Precambrian Basement. The mineral occurrence related to this complex are represented by uninteresting carbonatite dykes/viens and fluorite veins, having considerable economic importance. Jebel Dumbeir is anorogenic igneous complex emplaced in Precambrian terrain consisting of gneiss and volcano-sedimentary sequence of schists, quartzites, calcsilicates and marbles. A post-magmatic model is proposed to explain the formation of Dumbeir fluorite veins. In this model, fluorites are considered as meso-telethermal hydrothermal deposits, genetically related to the peralkaline rocks of Dumbeir Complex. Mineralization of fluorites is likely to have started during early magmatic crystallization and proceeded, at different degrees, to a latest hydrothermal phase. Tectonism and mineralization are strong interrelated. Mineral deposition has certainly passed through different stages, which were related to specific hydrothermal phases. Further studies on Dumbeir fluorites, especially fluid inclusions and microprobe analysis together with detailed exploration, are strongly encouraged.
