Baratoux Lenka auteur aut IRD Metelka V. auteur aut IRD Naba S. auteur aut IRD Ouiya P. auteur aut IRD Siebenaller Luc auteur aut IRD Jessell Mark auteur aut IRD Nare A. auteur aut IRD Salvi S. auteur aut IRD Beziat D. auteur aut IRD Franceschi G. auteur aut IRD text journalArticle eng text/pdf born digital access The interpretation of high-resolution airborne geophysical data integrated with field structural and lithological observations were employed in the creation of a litho-structural framework for the Gaoua region, Burkina Faso. The granite-greenstone domain of Paleoproterozoic age was affected by multiple deformation and mineralization events. The early tectonic phase is characterized by the emplacement of voluminous tholeiitic and calc-alkaline lavas, probably in a volcanic arc setting. The copper mineralization in Gongondy, Dienemera and Mt Biri is concentrated in a diorite/andesite breccia, and is interpreted as porphyry-copper style formed at an early stage of the evolution of the area. Evidence for the first deformation event D1(Ga) corresponding to N-S shortening was only found in the E-W trending mafic unit bordering the Gaoua batholith to the south. A second deformation phase D2(Ga) occurred under greenschist facies conditions and lead to a development of more or less penetrative metamorphic foliation and its subsequent folding under overall E-W compression. At later stages, the D2(Ga) switched to a transcurrent regime characterized by intense N-S to NW-trending steeply dipping shear zones. The first significant gold mineralization event is related to this transcurrent tectonic phase. During subsequent D3(Ga), intense network of brittle to brittle ductile NW and NE faults developed. Economic gold concentrations are attributed to the D3(Ga) event and are associated with the remobilization of early disseminated low grade gold concentrations. Significant deposits in the area are Nassara, Gomblora, Batie West and Kampti. The last deformation event D4(Ga) resulted in E-W trending thrust faults and crenulation cleavage planes, under overall N-S compression. No mineralization events related to this stage have been seen. specialized West African Craton Burkina Faso Paleoproterozoic Tectonics Porphyry copper deposit Orogenic gold deposit BURKINA FASO 064 066 Jessell Mark ed. edt IRD Liégeois J.P. ed. edt IRD 112, part B No spécial 419-439 2015 1464-343X https://www.documentation.ird.fr/hor/fdi:010066068 10.1016/j.jafrearsci.2015.10.004 1464-343X [F B010066068] https://www.documentation.ird.fr/hor/fdi:010066068 https://www.documentation.ird.fr/intranet/publi/2016/01/010066068.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-02-02 2017-08-23 fdi:010066068 fre