Perrouty S. auteur aut IRD Jessell Mark auteur aut IRD Bourassa Y. auteur aut IRD Miller J. auteur aut IRD Apau D. auteur aut IRD Siebenaller Luc auteur aut IRD Velasquez G. auteur aut IRD Baratoux Lenka auteur aut IRD Ailleres L. auteur aut IRD Beziat D. auteur aut IRD Salvi S. auteur aut IRD text journalArticle eng text/pdf born digital access The Ashanti greenstone belt in southwest Ghana hosts many gold deposits distinguished by different timing and structural contexts. This study investigates the evolution of the Wassa system by integrating field and geophysical observations. This 4 million ounces (past production and current resources) gold deposit is interpreted to represent the oldest gold mineralization event in West Africa with gold-bearing pyrites aligned and stretched within the Si ductile fabric. Mineralized quartz-carbonate veins were strongly deformed during the D1 deformation event. Three additional folding events are characterized by hectometer-scale tight to isoclinal folds, by a kilometer-scale synform fold centered on the mine and by a late recumbent metric-scale folds. Because of its early timing, the Wassa system represents a new poly-deformed deposit type in West Africa and highlights a potential for new discoveries in the underexplored meta-volcanic and meta-sedimentary Sefwi Group. Timing of the gold mineralization at the Wassa mine makes this deposit type a possible candidate for the source of the gold contained in the Tarkwa paleoplacer. specialized Wassa Birimian Tarkwaian Eburnean Eoeburnean Ashanti Belt GHANA 064 Jessell Mark ed. edt IRD Liégeois J.P. ed. edt IRD 112, part B No spécial 536-547 2015 1464-343X https://www.documentation.ird.fr/hor/fdi:010066072 10.1016/j.jafrearsci.2015.03.003 1464-343X [F B010066072] https://www.documentation.ird.fr/hor/fdi:010066072 https://www.documentation.ird.fr/intranet/publi/2016/01/010066072.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-02-02 2017-08-23 fdi:010066072 fre