The southern part of the Toumodi-Fètêkro greenstone belt is located in central-southeastern Côte d'Ivoire. The lithologies encountered in the felsic rocks can be subdivided in to three units corresponding to volcanic lavas (dacites, rhyodacites and rhyolites), pyroclastics rocks (ignimbrites) and granitoids (granodiorites and granites). All of these lithologies have been generally foliated and metamorphosed in to greenschist facies. Geochemical data show that these felsic rocks are metaluminous to peraluminous, calc-alkaline and have characteristics of magmatic arc rocks (TiO2 < 2 %). The dacites are sodic and the granitoids are “I” Type. Geochemical trends show a possibility of mixing due to the existence of a small Archean legacy component.
This study was carried out with the aim of clarifying the lithostratigraphy of the Dougbafla –Bandama area located in the southern part of the Birimian belt of Fettékro, in the center-West of Côte d’Ivoire. The vertical succession of these formations can be summarized at the base by volcanic rocks (basaltic and andesitic) mainly basalts, with in intermediate positions several successive volcaniclastic flows of autobrechic type and at the top by Various sedimentary lithologies usually composed of black schists or a more modest volume of sericite or chlorite schists capped with quartzites. These various shales sometimes play an important role of transition between lithologies. This complex is intersected by intrusions (granites, granophyres, granodiorites, tonalites, epidiorites, microgranodiorites, microdiorites, lamprophyres) and several generations of veins and quartz veinlets.