Abstract
The Ivory Coast is situated at the southern limits of the West African Craton and constitute a part of the ‘Dorsale de Man’. The precambrian rocks occupy 97% of the superficial area of the country and include rocks of two orogenic episodes: the Liberian (3000-2580 Ma) and the Eburnian of lower Proterozoic (2400-1550 Ma). Liberian Orogeny, which is the most ancient, consists of gneisses, amphibo-pyroxinites, fine-grained itabirites and coarse-grained ferruginous quartzites. The aluminous gneisses, amphibo-pyroxinites and ferruginous quartzites are supracrustals that have been transformed by a high grade Catasonal metamorphism resulting in highly folded rocks. The Liberian plutons are infracrustals consisting of complex basic and ultrabasic rocks, migmatites, charnockites and granites associated with magmatites. This Liberian complex is intruded by some dolerites (2200 Ma), and kimberlites with diamond (2210–2500 Ma) which have been eroded to produce Birrimian placer deposits of Tortiya and Birrim in Ghana. The eburnian geosyncline consists of alternating subparallel intrageosynclines and intrageanticlines. The volcano-sedimentary complexes were intruded by eburnian plutons of 2100-1550 Ma. About 20 different types of mineralisations are common within the Pre-Cambrian rocks of the Ivory Coast and they are of Archaen to lower Proterozoic age. Examples of these mineral concentrations are cited in this paper.
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