Hydrothermal Alteration Associated with the Kiaka World-Class Gold Deposit (Burkina Faso, West Africa)  

作　　者：Benjamin Sawadogo Gounwendmanaghré Hubert Zongo Wilédio Marc-Emile Bonzi Kalidou Traore Sâga Sawadogo Ousseni Yameogo Ousmane Bamba Guy Franceschi Benjamin Sawadogo;Gounwendmanaghré Hubert Zongo;Wilédio Marc-Emile Bonzi;Kalidou Traore;Sâga Sawadogo;Ousseni Yameogo;Ousmane Bamba;Guy Franceschi(Laboratoire Gosciences & Environnement (LaGE), Dpartement des Sciences de la Terre, Universit Joseph Ki-Zerbo, Ouagadougou, Burkina Faso;IRD, Ouagadougou, Burkina Faso;Ecole Suprieure dIngnieries, Universit de Fada Ngourma, Fada NGourma, Burkina Faso;Unit de Formation et de Recherche en Sciences Appliques et Technologies (UFR-SAT), Universit Daniel Ouezzin Coulibaly, Ddougou, Burkina Faso;Laboratoire de Godynamique et de Cartographie, des Techniques et des Technologies de Bamako, Universit des Sciences, Bamako, Mali;West African Resources LTD, Ouagadougou, Burkina Faso;GF Consult bvba, Gent, Belgium)

机构地区：[1]Laboratoire Gosciences & Environnement (LaGE), Dpartement des Sciences de la Terre, Universit Joseph Ki-Zerbo, Ouagadougou, Burkina Faso [2]IRD, Ouagadougou, Burkina Faso [3]Ecole Suprieure dIngnieries, Universit de Fada Ngourma, Fada NGourma, Burkina Faso [4]Unit de Formation et de Recherche en Sciences Appliques et Technologies (UFR-SAT), Universit Daniel Ouezzin Coulibaly, Ddougou, Burkina Faso [5]Laboratoire de Godynamique et de Cartographie, des Techniques et des Technologies de Bamako, Universit des Sciences, Bamako, Mali [6]West African Resources LTD, Ouagadougou, Burkina Faso [7]GF Consult bvba, Gent, Belgium

出　　处：《Open Journal of Geology》2024年第12期989-1015,共27页地质学期刊(英文)

摘　　要：This paper aims to show the relationships between hydrothermal alteration, deformation and gold mineralization in the main area of the Kiaka deposit. The Kiaka gold deposit is located in the South-central of Burkina Faso in the Tenkodogo volcano-sedimentary belt. Mineralization is primarily hosted by amphibolite, mylonitized quartz microdiorite and meta-sediment. The combination of petrographic, metallographic and geochemical analysis along with structural deformation of the ore body allowed us to distinguish the three main stages of hydrothermal alteration in the Kiaka gold deposit. (i) The first stage is characterized by ductile deformation which induces potassic- and LILE-rich alteration with crystallization of disseminated pyrrhotite. (ii) The second stage corresponds to chloritization and is associated with a brittle-ductile deformation and retrograde metamorphism. A second generation of disseminated pyrrhotite and a few pyrite and chalcopyrite crystallized during this event. Pyrrhotite also fills veins. (iii) The third alteration stage is characterized by a significant carbonation and concurrent with a brittle deformation. It is accompanied locally by a high-grade gold mineralization (up to 29 g/t).This paper aims to show the relationships between hydrothermal alteration, deformation and gold mineralization in the main area of the Kiaka deposit. The Kiaka gold deposit is located in the South-central of Burkina Faso in the Tenkodogo volcano-sedimentary belt. Mineralization is primarily hosted by amphibolite, mylonitized quartz microdiorite and meta-sediment. The combination of petrographic, metallographic and geochemical analysis along with structural deformation of the ore body allowed us to distinguish the three main stages of hydrothermal alteration in the Kiaka gold deposit. (i) The first stage is characterized by ductile deformation which induces potassic- and LILE-rich alteration with crystallization of disseminated pyrrhotite. (ii) The second stage corresponds to chloritization and is associated with a brittle-ductile deformation and retrograde metamorphism. A second generation of disseminated pyrrhotite and a few pyrite and chalcopyrite crystallized during this event. Pyrrhotite also fills veins. (iii) The third alteration stage is characterized by a significant carbonation and concurrent with a brittle deformation. It is accompanied locally by a high-grade gold mineralization (up to 29 g/t).

关 键 词：Gold Deposit Hydrothermal Alteration DEFORMATION GEOCHEMISTRY Burkina Faso 

分 类 号：P61[天文地球—矿床学]