We examine the petrographical and mineralogical characteristics of Iron-Titanium-Vanadium oxide mineralizations associated with the doleritic dykes crosscutting the Téra-Ayorou pluton, located in the north of the Niger Liptako, which corresponds to the northeastern margin of the Léo-Man shield in the southern part of the West African Craton. These mineralizations are part of mineral resources discussed in this craton, but for which studies have been fragmentary and not known particularly in the Niger Liptako basement. The main of this study is to determine the metallogenic characteristics of these mineralizations through data collected in the field and processed in laboratory. Field data indicate that Fe-Ti-V oxide mineralizations of the Téra-Ayorou pluton are associated with hematite, in the form of iron oxides, and formed during surface weathering. Thin sections, EDS and SEM maps demonstrated that these mineralizations occur as Fe-Ti-V oxides in titanomagnetite with ilmenite exsolutions, in titanomaghemite, and in metal sulfides and some silicate minerals such as clinopyroxenes, hornblende, chlorite, and the emplacement mechanism suggest formation essentially during magma evolution. Electron microprobe analyses data indicate high concentrations in TiO2 (21.61–50.51 wt%), FeO (3.47–67.16 wt%), and low V2O5 (0.001–0.005 wt%) for the oxidized minerals, and suggest several sources, notably fractional crystallization, deuteric oxidation and hydrothermal alteration. These mineralizations are associated with high Ca and S content in titanomagnetite and sulfides respectively and minor Mn and Cr contents in titanomaghemite and clinopyroxene respectively. Its occur as disseminated in these dykes and originate from lithospheric mantle and formed in magma chamber.
Fe-Ti-V oxides, mineralizations, doleritic, dykes, Téra-Ayorou, Liptako.
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