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     Eglab geostructural context in African Western Craton (COA)


the Western African craton is composed of two shields of age Archean and Paleoproterozoïc, the Réguibat dorsal in North and the dorsal of Léo in the South, separated by the sediments proterozoïc with paleozoic from the basin of Taoudeni and bordered by the chains panafricaines and hercyniennes. These two shields are composed of formations of age Archéen in the West and Protérozoïque (Birrimien) in the East. The archaean crust was built, deformed and metamorphosed during the pre-Leonian cycles (3500 My) (Potrel and Al, 1996; Thiéblemont and Al, 2001), Leonian (2900-3000 My) and Bast (2700-2800 My) (Bessoles, 1977; Beckinsale and Al, 1980; MacFarlane and Al, 1981; Kouamelan, 1996; Thiéblemont and Al, 2001). The birrimians' formations are mainly represented by sedimentary rocks, volcanic sets (Bessoles, 1977) and granites syn-kinematics affected towards 2,1 Ga by a major event thermo-tectonics (orogenese eburnean, Milési and Al, 1989) associated an episode of formation of ontinental crust youthful (Abouchami and Al, 1990; Boher and Al, 1992; Kouamelan and Al, 1997; Doumbia and Al, 1998; Equal and Al, 2002).

 

 
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