Lithology, Mineralogy and Quartz Grain Morphoscopy of the SB Well, Birisso (eastern Ivorian basin): a Paleoenvironmental Approach

DJEYA Kouamé Leger^1, , KOFFI Chiaye Larissa Epouse Coulibaly², TOE-BI Kahou Katel Kizito³, KOFFI Djemele Akissi Tatiana⁴, YOUGONE BI Gervais¹ and YAO N’goran Jean Paul¹

¹Laboratory of Geosciences of Sedimentary and Energy Environments, UFR STRM, University Felix Houphouet- Boigny, Abidjan, 01 BP V 34 Abidjan 01, Côte d’Ivoire

²Department of Mines and Reservoirs. UFR Geological and Mining Sciences. University of Man, BP 20 Man; Côte d’Ivoire

³Department Geosciences, University Peleforo Gon Coulibaly, Korhogo, BP 1328 Korhogo, Côte d’Ivoire

⁴Institut National Polytechnique Félix Houphouët-Boigny BP 1093 Yamoussoukro, Côte d'Ivoire

Cite this paper:
DJEYA Kouamé Leger, KOFFI Chiaye Larissa Epouse Coulibaly, TOE-BI Kahou Katel Kizito, KOFFI Djemele Akissi Tatiana, YOUGONE BI Gervais and YAO N’goran Jean Paul. Lithology, Mineralogy and Quartz Grain Morphoscopy of the SB Well, Birisso (eastern Ivorian basin): a Paleoenvironmental Approach. American Journal of Environmental Protection. 2026; 14(2):40-44. doi: 10.12691/env-14-2-3

Abstract

This study focuses on 13 samples from the SB well of Birisso, in the eastern onshore part of the Ivorian sedimentary basin, born from the opening of the South Atlantic during the Cretaceous. It combines lithology, binocular mineralogy and morphoscopy of quartz grains to reconstitute the depositional environments. The shaft shows four units with decreasing grain size upwards: purplish sands and clays at the base, fine sands with ferruginous sandstone, bitumen and marl in the middle, then a lateritic armour at the top. Quartz dominates (76.42%), followed by iron oxides (15.81%), while pyrite, glauconite, bitumen and carbonaceous debris are present in small quantities. The association glauconite-pyrite-organic matter indicates a shallow marine environment, first oxidizing then becoming reductive, sign of a marine transgression. Quartz grains are mostly blunt and shiny (60%), so they are transported by water over a long distance. The roundabouts (30%) reveal a wind input, and the angular grains (10%) a river transport. The sediments are thus of continental origin, resulting from aqueous and wind processes. The shallow marine environment, first oxidizing (glauconite) then becoming reductive and anoxic during a transgression (pyrite, bitumen), received continental sediments transported by water and wind, with variations in transport energy. Sedimentation is therefore complex and polyphasic, with alternations of transgression and regression, and the presence of zircons and phosphates opens up economic prospects.

Keywords:
Ivory Coast morphoscopy Birisso Palaeoenvironments Sedimentology

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