Publications des scientifiques de l'IRD

Perrouty S., Jessell Mark, Bourassa Y., Miller J., Apau D., Siebenaller Luc, Velasquez G., Baratoux Lenka, Ailleres L., Beziat D., Salvi S. (2015). The Wassa deposit : a poly-deformed orogenic gold system in southwest Ghana. Implications for regional exploration. In : Jessell Mark (ed.), Liégeois J.P. (ed.). Tectonics, mineralisation and regolith evolution of the West African Craton. Journal of African Earth Sciences, 112, part B (No spécial), p. 536-547. ISSN 1464-343X.

Titre du document
The Wassa deposit : a poly-deformed orogenic gold system in southwest Ghana. Implications for regional exploration
Année de publication
2015
Type de document
Article référencé dans le Web of Science WOS:000367410800010
Auteurs
Perrouty S., Jessell Mark, Bourassa Y., Miller J., Apau D., Siebenaller Luc, Velasquez G., Baratoux Lenka, Ailleres L., Beziat D., Salvi S.
In
Jessell Mark (ed.), Liégeois J.P. (ed.), Tectonics, mineralisation and regolith evolution of the West African Craton
Source
Journal of African Earth Sciences, 2015, 112, part B (No spécial), p. 536-547 ISSN 1464-343X
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.
Plan de classement
Géologie et formations superficielles [064]
Description Géographique
GHANA
Localisation
Fonds IRD [F B010066072]
Identifiant IRD
fdi:010066072
Contact