Nouvelles données lithostructurales, pétrographiques, minéralogiques et géochimiques sur le gisement de cuivre d'Akjoujt et son environment géologique (République Islamique de Mauritanie)

Progress within mining exploitation and recent drilling provides additional data on the stratigraphic and structural setting of the Akjoujt's copper mine. We confirm the synclinal pattern of the mineralized carbonate layer. The mineralization is linked to the sediments of a volcano-sedimentary basin, reactivated during metamorphism which occurred during the late Proterozoic or the early Paleozoic time. Then, two folding phases, hercynian to late hercynian, generated a trap-shape structure owing to their local dispositions. The supergene processes enhance the Cu-enrichment of the oxidized zone. The mineralogical and geochemical features of metavolcanic rocks together with the geological environment may be related to an active plate margin.