Ouiya P. auteur aut IRD Siebenaller L. auteur aut IRD Salvi S. auteur aut IRD Béziat D. auteur aut IRD Naba S. auteur aut IRD Baratoux Lenka auteur aut IRD Naré A. auteur aut IRD Franceschi G. auteur aut IRD text journalArticle eng text/pdf born digital access The Nassara-Au prospect is located in the Birimian Boromo Greenstone Belt in southwestern Burkina Faso. It is part of a larger mineralized field that includes the Cu-Au porphyry system of Gaoua, to the north. At Nassara, mineralization occurs within the West Bade Shear Zone that follows the contact between volcanic rocks (basalt and andesite) and volcano-sediments (pyroclastics and black shales) at the southern termination of the Boromo Belt. Gold is associated with pyrite and other Fe-bearing minerals that occur disseminated within the sheared volcanic and volcano-sedimentary rocks. In particular, highest grades are distinguished in alteration halos of small quartz-albite-ankerite veins that form networks along the shear zone. Here, pyrites are marked by As-poor and As-rich growth zones, the latter containing gold inclusions. Gold mineralization formed during D2(NA). Subsequent shear fractures related to D3(NA) related are devoid of gold. Nassara is a classical orogenic gold occurrence where gold is associated to disseminated pyrite along quartz veins. specialized West African Craton Boromo Greenstone Belt Burkina Faso Orogenic gold Shear zone BURKINA FASO 064 78 623-630 2016 0169-1368 https://www.documentation.ird.fr/hor/fdi:010067639 10.1016/j.oregeorev.2015.11.026 0169-1368 [F B010067639] https://www.documentation.ird.fr/hor/fdi:010067639 https://www.documentation.ird.fr/intranet/publi/2016/08/010067639.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-09-05 2017-08-23 fdi:010067639 fre