International Journal of Multidisciplinary Research and Development

Authors
Ekomane Emile, Bomolomo Michelle Vanessa, Zo’o Zame Philemon, Bisse Salomon Bertrant, Angtouzou Waya

Abstract
Mineralogical and geochemical studies have been carried out on two alluvial profiles localised at the banks of an affluent of the Mayo Sina, South West of Chad. They were carried out in order to determine the composition of the source rock and the tectonic setting during the emplacement of the studied materials. The mineralogical and geochemical characteristics show that whole rocks, on which alluvial profiles are developed are limestone. Elemental ratios and binary diagrams suggest that the overlying materials are derive from mainly felsic rocks, with only minor contributions from a sedimentary and/or basic source. Consequently, these data suggest that, the overlying materials are not derive from the alteration of limestone, but they are transported clastic sediments and consistently suggest a continental island arc and/or active margin setting as the more probable geodynamic scenario for the deposition of the sedimentary precursors of the studied materials.