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Magnetic Facies and Polymetallic Sulphides Deposit in the Mafic and Ultramafic Intrusions of Samapleu (Western Côte d’Ivoire)

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Open Journal of Geology 2022年第10期12卷 811-827页

作者： Simon Pierre Djroh Gnamba Emmanuel Franck Gouedji Ehui Beh Jean Constantin Aka Boko Célestin Sombo christian picard Marc-Antoine Audet Bouaké Bakayoko Applied Geophysics Research Team Laboratory of Geology Mineral and Energy Resources (LGRME) Faculty of Earth Science and Mineral Resources Félix Houphouet Boigny University Abidjan C&ocirc te d’Ivoire Geology and Mining Sciences University of Man Man C&ocirc te d’Ivoire University of Franche-Comté (UMR 6249) 16 Route de Gray Besan&ccedil on France Sama Nickel-CI Sarl 2 Plateaux Vallons Abidjan C&ocirc te d’Ivoire

Mafic and ultramafic intrusions observed in the Archean formations of the Sipilou region exhibit occurrences of polymetallic sulphide. Mapping, petrographic and geochemical studies have defined magnetic facies associated with the various geological units. The results of this work reveal that cupronickel sulphides, olivines and pyroxenes as well as spinels are related to ultrabasic formations where strong magnetic facies prevail. Iron sulphides and magnetite are linked to quartzo-feldspathic and jotunite-enderbite formations, which are characterised by moderate magnetic facies. The latter are thought to be derived from anatexite remobilisation within Archean granulites, which have weak magnetic facies.

关键词： Magnetic Facies Mapping Petrography Geochemistry Sulphides Côte d’Ivoire

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Archean Tonalite-Trondhjemite-Granodiorite Suites Bearing Orthopyroxene Mineral of the Bounta Region and Their Sulfide and Oxide Iron Mineralization (Western Ivory Coast)

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Journal of Minerals and Materials Characterization and Engineering 2022年第6期10卷 489-504页

作者： Gnamba Emmanuel Franck Gouedji Zié Ouattara Clément Odon N’cho Abou Junior Diaby christian picard Marc-Antoine Audet Bouaké Bakayoko Bamory Kamagate UFR Sciences Géologiques et Minières Université de Man Man C&#244 te d’Ivoire University of Franche-Comté France ISTerre University of Grenoble-Alpes Grenoble France Sama Nickel-CI Sarl Abidjan C&#244 te d’Ivoire Laboratoire de Géosciences et Environnement UFR SGE Université de NANGUI ABROGOUA (UNA) Abidjan C&#244 te d’Ivoire

The mining company Sama Nickel-CI during its exploration activities in the Bounta area (Biankouma department, western Côte d’Ivoire) identified rocks with magmatic and metamorphic characteristics of felsic to mafic compositions mineralized in sulfide but unknown in the region. Thus, the petrographic characterization of these rocks of Bounta as well as the sulfides they contain, was carried out from macroscopic to microscopic observations. Petrographic analysis of these rocks has shown that these rocks are trondhjemite, tonalite and granodiorite (TTG) suites, composed of the main minerals (quartz, plagioclase, orthopyroxene, amphibole, feldspar) and accessory minerals (biotite, garnet) with magmatic textures supplanted by metamorphic textures. They were set up by fractional crystallization and would be products of Archean crustal anatexis formed from the partial melting of basaltic protocrust during the Liberian orogeny. The Bounta’s series of trondhjemite, tonalite and granodiorite (TTG) contain speckles of sulfide (pyrite and pyrrhotite) which are disseminated in places and are relatively abundant, as well as iron oxides (magnetite) which are of low proportion.

关键词： Petrography Trondhjemite Tonalite and Granodiorite of Bounta Western Ivory Coast

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