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Multi-Scale Approach for Gold Targeting in Côte d’Ivoire Paleoproterozoic Rocks

Open Journal of Geology 2024年第2期14卷 155-176页

作者： Martial Pohn Koffi Adingra Yao Augustin Koffi n’guessan nestor houssou Zié Ouattara Tokpa Kakeu Lionel-Dimitri Boya Marc Ephrem Allialy Training and Research Unit in Earth Sciences and Mineral Resources Laboratory of Geology Mineral and Energy Resources University Felix HOUPHOU&#203T-BOIGNY Abidjan C&#244te d’Ivoire Training and Research Unit in Geological Sciences and Mining Department of Geology and Material Man University Man C&#244te d’Ivoire

The aim of this study is to contribute to better targeting of gold prospecting areas using geospatial information. To this end, 3 mining sites were selected for the study. They are: the Sénoufo belt (Barrick Gold mine), the Yaouré complex (Perseus Mining mine) and the South Fetêkro belt (Bonikro, Hiré and Agbaou mines). For this study, a multi-scale approach was carried out at regional, mine and microscopic levels. At the regional scale, a comparative analysis of 1:200,000 scale geological maps revealed that 3 main lithologies are regularly repeated on and around the various mining sites. These are: undifferentiated volcanics, metagranodiorites and metasiltites dominated by meta-arenites. Most of these lithologies are affected by undifferentiated faults generally oriented nE-SW, n-S, EnE-WSW and WnW-ESE. In addition, gold and manganese occurrences are present on all the sites studied. At the mine scale, radarsat-1 images processing indicate that the main mining sites are generally located near or at the intersection of lineaments-oriented nE-SW or n-S on the one hand and E-W or EnE-WSW or WnW-ESE or again nW-SE on the other. These mines are also located at the interface between zones of high and low lineament density. At the microscopic scale, petrographic studies of undifferentiated volcanic samples from the various sites indicate that they consist of andesites, meta-andesites and tuffs.

关键词： Gold Targeting Undifferentiated Volcanics Mineral Occurrences Lineaments Côte d’Ivoire

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Petrographic and Structural Studies of the Guintéguéla Formations (northwest of Côte d’Ivoire)

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Open Journal of Geology 2024年第1期14卷 29-49页

作者： Mohamed Samuel Moriah Conte n’guessan nestor houssou Oumar Barou Kaba Mohamed Lamine Timite Abdoulaye Kadiatou Diallo Aly Soumah Mohamed Camara Mohamed Fofana Djibril M’Mamy Camara Applied Research Laboratory Fundamental Geology and Prospecting Research Unit Emergent Centre Mines and Society Higher Institute of Mines and Geology of Boké Boké Republic of Guinea Laboratory of Geology and Energy Resources (LGRME) UFR of Earth Sciences and Mineral Resources University Felix Houphouet Boigny Abidjan Republic of Ivory Coast Applicated Research Laboratory Mining and Resource Development Research Unit Emergent Centre for Mines and Society Higher Institute of Mines and Geology of Boké Boké Republic of Guinea

Côte d’Ivoire is currently experiencing strong growth in the mining sector. Identifying the formations present in our subsoil is therefore essential for mining recovery. It is in this context that we conducted studies on the formations present in the locality of Guintéguéla. It is located in the northwest of Côte d’Ivoire in the bafing region. The aim of this work was to determine the petrographic and structural characteristics of the formations of the area. The methodology began with documentation and then followed petrography and structural analysis work on the macroscopic and microscopic levels. We observed six groups of rocks: granitoids, amphibolites, orthogneiss, quartzites (poor and rich in magnetites), volcano-sediments and filonian rocks. Metamorphism is of amphibolite to granulite facies. However, volcano-sediments must be associated with the green schist facies. With regard to the structural, structures and microstructures such as foliation;fractures;sigmoidal figures reveal that the studied area was affected by ductile and also brittle tectonics whose main directions are oriented along the shear corridor, so n-S to nnW-SSE.

关键词： Mining Petrography Structural Metamorphism

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Petrographic and Structural Studies of the Guintéguéla Formations(northwest of Côte d’Ivoire)

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Open Journal of Geology（地质学期刊） 2024年第1期

作者： Mohamed Samuel Moriah Conte n’guessan nestor houssou Oumar Barou Kaba Mohamed Lamine Timite Abdoulaye Kadiatou Diallo Aly Soumah Mohamed Camara Mohamed Fofana Djibril M’Mamy Camara

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Petro-Geochemistry Contraints of Côte d’Ivoire north-East Plutonites: Implications for Eoeburnean Magmatism of Baoulé-Mossi Domain (Southern of West African Craton)

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Journal of Geoscience and Environment Protection 2022年第9期10卷 185-206页

作者： Brice Roland Kouassi Marc Ephrem Allialy n’guessan houssou nestor Kouadio David Koffi UFR-Biological Sciences Geosciences Department Peleforo Gon Coulibaly University Korhogo C&#244 te d’Ivoire Laboratory of Geology Mineral and Energy Resources/Training and Research Unit in Earth Sciences and Mineral Resources Félix Houphou&#235 t-Boigny University Abidjan C&#244 te d’Ivoire

Plutonites are part of the set of crystallines compose the Precambrian basement. Their study is capital because it allows participating in the debates on the geodynamic evolution of the West African craton. This study concerns granitoids and dioritoids of the north-East of Côte d’Ivoire located in the Man-Leo ridge structured by Eoeburnean magmatism. The petrographic and geochemistry constraints make it possible to say that these rock formations have evolved by the process of fractional crystallization. They have a hybrid origin (mantle and crust), metaluminous to peraluminous highlighted by geochemistry. Concerning the geotectonic context, these plutonites of the Baoulé-Mossi domain are emplacement in a context of subduction more precisely in a context of volcanic arc.

关键词： Plutonites Contraints Magmatism Source Geotectonics Côte d’Ivoire West African Craton

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Structural Control of Auriferous Mineralization in the Birimian: Case of the Agbahou Deposit in the Region of Divo, Côte d’Ivoire

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International Journal of Geosciences 2017年第2期8卷 189-204页

作者： n’guessan nestor houssou Marc Ephrem Allialy Fossou Jean-Luc Hervé Kouadio Allou Gnanzou Geology of Basement and Metallogeny Laboratory (GBML) Training and Research Unit of Earth Sciences and Mining Re-sources University of Felix HOUPHOUET-BOIGNY Abidjan-Cocody Cote d’Ivoire

Located in the southwestern of the Oume-Fettekro greenstone belt, the Agbahou gold deposit is controlled by structural factors. Geophysics, teledetection and core data suggest the presence of nE and nW faults. However, the nE-faults define two major shear zones (ATZ: Agbahou Tectonic Zone and WTZ: West Tectonic Zone) that control the Agbahou gold mineralization. These first order structures are subparallel to the regional tectonic grain mostly north-east oriented. They seem to respectively develop on the both arms (eastern and western) of an anticline moderately plunging ~25° towards northeast. Each shear-zone contains several second-order shear-zones or lenses of variable direction and of 50° - 80° dip. nW-faults however correspond to strike-slip faults and their development should be related to transcurrent tectonics. They acted as control channels on the distribution of gold mineralizations. The ductile-brittle character of shear-zones favored the ascent of hydrothermal fluids and the formation of multiple auriferous quartz veins: veins Type IIa and veins Type IIb relating respectively to the shear-veins and extensional veins. However, Agbahou also shows the existence of a disseminated sulphides-bearing mineralization within host-rocks. At Agbahou, the precipitation of gold probably occurred in a post to late ductile-brittle deformation period.

关键词： Gold-Bearing Mineralization Structural Control Birimian Agbahou Ivory Coast

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Petro-Structural Study of Paragneiss in the SASCA Domain(GbowéSector at Grand-Bereby),Southwestern Cote d’Ivoire

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Journal of Geoscience and Environment Protection 2020年第5期8卷 1-16页

作者： Fossou Jean-Luc Hervé Kouadio Mamadou Sangare n’guessan nestor houssou Marc Ephrem Allialy Sagbrou Chérubin Djro Laboratory of Geology Mineral and Energy Resources(LGRME)Faculty of Earth Science and Mineral ResourcesFélix Houphouet Boigny UniversityAbidjanCote d’Ivoire

The petrographic and structural study of Gbowé (Grand-Béréby) formations located in the SASCA domain (South-West of Côte d’Ivoire) revealed migmatitic paragneisses. For an in-depth understanding of the petrographic, structural and metamorphic characteristics, six (6) thin sections were made from these paragneisses. These gneisses are characterized by paleosomes and neosomes (leucosome and melanosome), consisting of quartz, garnet, plagioclase, biotite, cordierite, sillimanite, myrmekite and microcline. The mineralogical assemblage thus described indicates a retrograde metamorphism (transition from granulitic facies to amphibolitic facies). The structural and microstructural study identified two types of deformation (ductile and brittle). The ductile deformation is characterized by phases D1 (nE-SW flattening) and D2 (nW-SE flattening), materialized by foliations (n140˚, n050˚), folds (asymmetrical folds, similar folds, concentric folds, ptymatic folds) and boudins. Fracture schistosity and fold fracture schistosity are characteristic of the brittle deformation (phase D3). The microstructural study coupled with the metamorphic study shows that the deformations had an impact on the texture of the minerals (recrystallization and mineral reactions). It also allowed giving the paragenesis of phases D1 and D2. The D1 phase is characterized by garnet1, biotite1, quartz1, sillimanite1 and cordierite1 and the D2 phase is characterized by garnet1, quartz2, sillimanite2, biotite2, garnet2 and orthose2. These parageneses thus highlighted bear witness to a polydeformation and polymorphism that affects the study area.

关键词： Petrography Structural Migmatitic Paragneiss Retrograde Metamorphism Gbowé SASCA Domain C?te d’Ivoire

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Petrogenetic Characterization of the Geological Formations of the Localities of Goumere-Iguela in the South West of the Bui Belt (north-East of Cote d’Ivoire)

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Open Journal of Geology 2022年第11期12卷 947-972页

作者： Fossou Jean-Luc Hervé Kouadio Tokpa Kakeu Lionel-Dimitri Boya n’guessan nestor houssou Roger nicaise Kanga Alain nicasie Kouamelan Laboratoire de Géologie Ressources Minérales et Energétiques Université Félix Houphou&#235 t-Boigny Abidjan-Cocody C&#244 te d’Ivoire

Located in the north-east of Côte d’Ivoire, the Gouméré-Iguéla sectors were the subject of a geological mapping. These geological formations are located southwest of the Bui trench. In order to improve the petrogenetic knowledge of the study area, a multidisciplinary methodology integrating microscopic observations and geochemical analyses of major and trace elements was carried out on 15 samples considered as representative of the studied outcrops. The macroscopic and microscopic petrographic study allowed to highlight three major lithological units: 1) a volcano-plutonic unit, formed by gabbros and amphibole-pyroxenite, basalt and rhyodacite;2) a volcano-sedimentary unit containing pyroclastites (of basaltic and andesitic composition);3) a sedimentary unit (meta-sedimentary). These rocks are affected by a general metamorphism of green schist facies and a hydrothermal alteration with pervasive and vein alteration marked by the presence of quartz, calcite, epidote, chlorite and sericite. From a geochemical point of view, the results obtained indicate that the plutonites are gabbros while the volcanites and volcanosedimentary rocks have compositions of basalts, basaltic andesites, rhyolites and dacites. They have mainly a tholeitic character related to subduction zones with crustal contamination. The metasediments are arenites emplaced in an active continental margin environment.

关键词： Petrography Geochemistry Petrogenetics Gouméré-Iguéla Côte d’Ivoire

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Fouimba and Goma Mounts Greenstone Belts Litho-Structural Analysis Related to Côte D’Ivoire Birimian Geodynamic Setting and Implying in West-Africa Craton Gold Deposits

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Journal of Geoscience and Environment Protection 2023年第1期11卷 150-168页

作者： Marc Ephrem Allialy Brice Roland Kouassi n’guessan nestor houssou Fossou Jean Luc Kouadio Davy Bedel Siogbo Félix Oufouet Konan UFR-STRM Felix Houphouet-Boigny University Abidjan C&#244 te d’Ivoire UFR-Biological Sciences Géosciences Department Peleforo Gon Coulibaly University of Korhogo Korhogo C&#244 te d’Ivoire Ministry of Mines Petroleum and Energy Abidjan C&#244 te d’Ivoire

Mount Fouimba and Mount Goma (Seguela) greenstone belts petro-structural studies combine remote sensing, geophysics, petrography and structural analysis. In view of establishing mapping details of paleoproterozoic geological formations, geological setting rocks observed are essentially magmatic formations, such as two-mica granite, granodiorites, and porphyritic basalts;and a few metamorphics which are metatonalite, amphibolites and amphibo-lopyroxenites. Remote sensing, such as Landsat 8 OLI satellite imagery and geophysical data, has been combined to show regional nnE-SW shear zone. Tectonic structures and microstructures have enabled to identify two main deformation phases: D1 phase corresponding to compression, and D2 is a transpression phase. Mechanisms responsible for deformations are respectively flattening and transpression. Geological formations derived from mantle origin but contain crustal components, and their tectonic setting occurred during subduction.

关键词： Petro-Structural Mapping Greenstone Belt Birimian Séguéla Côte D’Ivoire

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Hydrothermal Alterations in Irbiben Gold Deposit (Tagragra Akka, Western Anti-Atlas, Morocco): Petrographic and Geochemical Characterization

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Journal of Geoscience and Environment Protection 2017年第11期5卷 46-60页

作者： Tokpa Kakeu Lionel-Dimitri Boya n’guessan nestor houssou Marc Ephrem Allialy Allou Gnanzou Lamia Erraioui Benyounes Maamar Souad M. Rabet Geology of Basement and Metallogeny Laboratory (GBML) Training and Research Unit of Earth Sciences and Mining Resources University of Felix HOUPHOUET-BOIGNY Abidjan-Cocody C&#244te d’Ivoire Georesources and Environment Laboratory Department of Geology Faculty of Sciences University Ibn Tofail Kenitra Morocco Managem Group Tower A Twin Center Casablanca Morocco

Irbiben is a small gold deposit of the Precambrian inlier Tagragra d’Akka located in the Moroccan western Anti-Atlas, approximately 160 km southeast from Tiznit. Petrographic study shows that host rocks of Irbiben deposit are green schist facies metamorphic rocks, like metamorphic sandstone and schist, meta-pelite and quartzite. Gold is located in quartz veins or host rock with frequent injections of quartz. The petrographic characterization of alteration through the description of the alteration profiles and the comparative study of protolith and altered rocks showed a development of dominant quartz and calcite in mineralization wall-rocks. In moving away from it, there is rather sericite and chlorite. These phenomena are materialized respectively by the development of SiO2 and CaO in the wall-rocks but rather that ferromagnesian elements (FeO, MgO) and K2O away from the mineralization. These trends were demonstrated by the geochemical study through Harker diagrams, description of alteration profiles, comparative study of protolith and altered rocks, and use of a new alteration index, MIA, elaborated during this work.

关键词： Irbiben Gold Deposit Hydrothermal Alteration Petrography Geochemistry Morocco

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Petrogenetic Characterization of the Geological Formations of the Localities of Goumere-Iguela in the South West of the Bui Belt (north-East of Cote d’Ivoire)

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Open Journal of Geology（地质学期刊） 2022年第11期

作者： fossou jean-luc hervé kouadio* tokpa kakeu lionel-dimitri boya n’guessan nestor houssou roger nicaise kanga alain nicasie kouamelan

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