Petrographic, morpho-structural and geophysical study of the quartzite deposit in the central part of Pouma, Littoral-Cameroon

• Published in: Results in geophysical sciences 2021-09, Vol.7, p.100019, Article 100019
• Main Authors: Jude, Paho Nteinmusi, Jean Victor, Kenfack, Pierre, Wotchoko, Anoh, Njoh Olivier, Abasoh, Makem Elvise, Malick Rosvelt, Demanou Messe, Tabod, Tabod Charles
• Format: Article
• Language: English
• Subjects: Boreholes; Density; Petrographic; Pouma; Quartzite; Vertical electrical soundings
• ISSN: 2666-8289; 2666-8289
• DOI: 10.1016/j.ringps.2021.100019

•The lineaments study reveals that the study area is crossed by NNE - SSW trending anomalies, the longest confirming the presence of a fracture.•Two types of weathering products have been identified; they reveal an extension of the quartzite deposit: gravely clayey sand on the surface of the quartzite formation, and clayey sand on the surface of other formations.•High resistivity values greater than 4800 Ω.m have been revealed in the center of the study area related to the abundance of quartz, main mineral of quartzite.•The curves typolology obtained at the center of the study area reveals a grouping of "A" type curves linked to the continuity of the petrographic type. The characterization of the Pouma-Cameroon quartzite deposit with the aim of determining its lateral extension along the Douala-Yaoundé axis required, among other things, the examination of the petrographic and morpho-structural domain as well as the determination of the electrical properties of the formations in the study area. 24 vertical electrical sounding points were carried out using a Schlumberger type electrode configuration; also, 7 manual auger boreholes were carried out, these resulted on one hand in the following types of curves: KH, QH, AKH, H, HK, AK, HA, A; and on the other hand to lithological logs with a clayey sandy texture, gravelly clayey sand to lateritic. The calculation of the densities as well as the petro-structural studies made it possible to confirm the geological context of the study area. The various results obtained permitted us to locate the fresh quartzite formation at the center of the study area. It stretches along the Douala-Yaoundé axis over 1871.4 m for the fresh formation and 1991 m for the slightly altered formation.