TITLE:
Petrogenetic Characterization of the Geological Formations of the Localities of Goumere-Iguela in the South West of the Bui Belt (North-East of Cote d’Ivoire)
AUTHORS:
Fossou Jean-Luc Hervé Kouadio, Tokpa Kakeu Lionel-Dimitri Boya, N’Guessan Nestor Houssou, Roger Nicaise Kanga, Alain Nicasie Kouamelan
KEYWORDS:
Petrography, Geochemistry, Petrogenetics, Gouméré-Iguéla, Côte d’Ivoire
JOURNAL NAME:
Open Journal of Geology,
Vol.12 No.11,
November
16,
2022
ABSTRACT: Located in the north-east of Côte d’Ivoire, the Gouméré-Iguéla sectors were the subject of a geological mapping. These geological formations are located southwest of the Bui trench. In order to improve the petrogenetic knowledge of the study area, a multidisciplinary methodology integrating microscopic observations and geochemical analyses of major and trace elements was carried out on 15 samples considered as representative of the studied outcrops. The macroscopic and microscopic petrographic study allowed to highlight three major lithological units: 1) a volcano-plutonic unit, formed by gabbros and amphibole-pyroxenite, basalt and rhyodacite; 2) a volcano-sedimentary unit containing pyroclastites (of basaltic and andesitic composition); 3) a sedimentary unit (meta-sedimentary). These rocks are affected by a general metamorphism of green schist facies and a hydrothermal alteration with pervasive and vein alteration marked by the presence of quartz, calcite, epidote, chlorite and sericite. From a geochemical point of view, the results obtained indicate that the plutonites are gabbros while the volcanites and volcanosedimentary rocks have compositions of basalts, basaltic andesites, rhyolites and dacites. They have mainly a tholeitic character related to subduction zones with crustal contamination. The metasediments are arenites emplaced in an active continental margin environment.