The present study focuses on the analysis of lineaments affecting Paleocene-Miocene formations in the Ader Doutchi sub-basin (Tahoua region, Iullemmeden basin, central Niger). The main objective of this study is to carry out a geostatistical analysis of the different lineamentary structures affecting the Bouza and Keita regions. The methodological approach adopted is based on the use of remote sensing techniques and GIS tools to analyze LandSat 8 images and to compare them with field data. This methodological approach facilitated the identification of five primary fracture families, characterized by orientations ranging from N0° to N40°, N40° to N80°, N90° to N130°, N130° to N150°, and N160° to N170°.
This study concerns the south-central part of the Iullemmeden intracratonic basin. The main objectives of the study were sedimentological analysis of the various facies and preliminary description of the nodules bearing phosphate mineralization in the Agougaran sector (Kao area, northern Ader Doutchi). The phosphate-bearing rocks are phospharudites. These occur as nodules of variable size and morphology. The phosphate nodules are hidden in the marl limestones or in attapulgite schists of the Barmou Member. Attapulgite schists contain the highest concentrations of nodules bearing phosphate mineralization. In the mineralized levels, nodules are either scattered or organized in layers or beds. The faunal association of the Barmou Member, which encases in the mineralized nodules, is made up of nautiluses, bivalves, sea urchins, gastropods, foraminifera and ostracods. This faunal association testifies to the emplacement of phosphate mineralization-bearing deposits in a confined marine environment.
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