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Petrographic, Geochemical and Metallogenical Context of the Geological Formations of the Goumere Region (North-East of Cote D’Ivoire): Implication to the Knowledge of Gold Mineralization

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International Journal of Geosciences 2024年第2期15卷 180-203页

作者： Fossou Jean-Luc Hervé Kouadio alain nicaise kouamelan Topka Kakeu Lionel Boya Roger nicaise Kanga Laboratory of Geology Mineral and Energy Resources (LGRME) Faculty of Earth Science and Mineral Resources Félix Houphou&#235t Boigny University Abidjan C&#244te d’Ivoire

The Gouméré region is located in the North-East of Côte d’Ivoire and is located in the South-West of the Bui furrow. In order to highlight the geology of the area studied, 14 samples were taken for studies using petrographic, geochemical and metallogenic methods. The study of macroscopic and microscopic petrography made it possible to highlight two major lithological units: 1) a volcano-plutonic unit, formed of gabbros, basalt, volcaniclastics and rhyodacite;2) a sedimentary unit (microconglomerate). From a geochemical point of view, the results obtained indicate that the plutonites are gabbro and gabbro diorite while the volcanics have compositions of basaltic andesites, rhyolite and dacites. The sediments have a litharenitic to sublitharenitic character. The metallogenic study made it possible to highlight hydrothermal alterations and metalliferous paragenesis on the formations studied. Hydrothermal alteration is characterized by the presence of carbonation, silicification, sericitization, sulfidation and to a lesser degree chloritization. Metalliferous paragenesis consists of pyrite, chalcopyrite, hematite and magnetite.

关键词： Petrography Geochemistry Metallogeny Gouméré Côte d’Ivoire

Magma Mixing Genesis of the Mafic Enclaves and Related Granitoids in the Kan Granite-Gneiss Complex of Central Côte d’Ivoire: Evidence from Geology, Petrology and Geochemistry

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Open Journal of Geology 2024年第8期14卷 760-786页

作者： Koffi Raoul Teha Koffi Kossonou Jean-Marie Pria Koffi Joseph Brou alain nicaise kouamelan Marc Ephrem Allialy Souad M’Rabet Mineral and Energy Resources Laboratory (LGRME) Flix Houphout-Boigny University Abidjan Ivory Coast Environmental Sciences and Technology Laboratory Department of Earth Sciences Jean Lorougnon-Guede Daloa University Daloa Ivory Coast Laboratory of Geosciences and Environment Department of Geology Ibn Tofal University of Knitra Knitra Morocco

The mafic enclaves from Paleoproterozoic domain are considered to be the results of large-scale crust-mantle interaction and magma mixing. In this paper, petrography, mineralogy and geochemistry were jointly used to determine the origin of the mafic enclaves and their relationship with the host granitoids of the Kan granite-gneiss complex. This study also provides new information on crust-mantle interactions. The mafic enclaves of the Kan vary in shape and size and have intermediate chemical compositions. The diagrams used show a number of similarities in the major elements (and often in the trace elements) between the mafic enclaves and the host granitoids. Geochemical show that the Kan rock are metaluminous, enriched in silica, medium to high-K calc-alkaline I-type granite. The similarities reflect a mixing of basic and acid magma. Mafic enclaves have a typical magmatic structure, which is characterized by magma mixing. The genesis of these rocks is associated with the context of subduction. They result from the mixing of a mafic magma originating from the mantle and linked to subduction, and a granitic magma (type I granite) that arises from the partial melting of the crust.

关键词： Magma Mixing Mafic Microgranular Enclaves Host Granitoids Kan Granite-Gneiss Complex West Africa

Crustal Evolution of Southern Part of the Ferkessédougou Batholith (Côte d’Ivoire, West African Craton): Implications for Baoulé-Mossi Domain Geodynamic

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Open Journal of Geology 2022年第9期12卷 648-662页

作者： Brice Roland Kouassi alain nicaise kouamelan Marc Ephrem Allialy Yawa Christine Boffouo Wilfried Digbeu UFR-Biological Sciences Géosciences Department Peleforo Gon Coulibaly University of Korhogo Korhogo C&#244 te d’Ivoire UFR-STRM Felix Houphouet-Boigny University Abidjan-Cocody Abidjan C&#244 te d’Ivoire

The southern Ferkessédougou batholith in the center-west of Côte d’Ivoire is the study area. The geology of this area includes granitoids (granodiorite, two-mica granite, biotite granite and muscovite granite) and metasediment panels. Petrographic studies were coupled with geochemical analyzes on the whole rock in order to provide new elements in the structural evolution of this portion of the West African craton. Petrographic data show that the basement of the Bonon area is partly identical to that of the northern part of the batholith. The structural data reveal three major phases of deformation that structured the study area. As for the geochemical data carried essentially on samples of granitoids, they indicated a high-k affinity the I type granite characteristics. The spectra of the REE normalized to chondrites, have moderate slopes with a fractionation highlighted by the ratios (La/Sm)N = 1.93 - 4.56 and (La/Yb)N = 7.69 - 32.28. The multi-element diagrams revealed negative anomalies in Ta-Nb implying the partial melting of a crust of TTG composition. Studies for the geotectonic environment have shown that the granitoids of the Bouaflé and Bonon region were emplaced in an arc environment associated with a subduction zone.

关键词： Ferkessedougou Batholith Granitoids Geodynamic Context Côte d’Ivoire

Geochemistry of Mafic Rocks from the Birimian Basement of Doropo (Northeast of Côte d’Ivoire): Petrogenetic and Geodynamic Implications

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Open Journal of Geology 2022年第6期12卷 504-520页

作者： Wilfried Digbeu alain nicaise kouamelan Asinne Tshibubudze Ziandjêdé Hervé Siagne Fossou Jean-Luc Hervé Kouadio Laboratoire de Géologie Ressources Minérales et Energétiques Université Félix Houphou&#235 t-Boigny Abidjan-Cocody C&#244 te d’Ivoire Council for Geosciences Pretoria South Africa

The northeastern region of Côte d’Ivoire is characterised by a granitic basement mainly composed of biotite granite rocks. According to mapping work in the Gbabédjou and Doropo areas, these Birimian granitoids are cut by gabbro dykes and amphibolite enclaves, which are the subject of this study. In order to better understand the role and the implication of mafic rocks in the Doropo basement emplacement, a multidisciplinary methodology integrating microscopic observations and geochemical analyses of major and trace elements was carried out on 4 samples considered representative of the outcrops studied. Green hornblende, clinopyroxene, and accessory sphene minerals are found in mafic mineral phases, according to petrographic research. Whole-rock analyses reveal that mafic samples with TiO2 contents 1.1 ratios giving them an orogenic granite nature (I-type). Their REE patterns are moderately fractionated (La/Sm)N = 2.66 - 6.13 and (La/Yb)N = 11.17 - 43.70) with a very negative Eu anomaly (Eu/Eu* = 0.75 - 0.97). The multi-element diagrams are characterized by negative Nb-Ta anomalies and geotectonic studies have identified them as volcanic arc formations. All these characteristics allowed us to distinguish the Doropo mafic rocks as formations originating from the juvenile continental crust, emplaced under the Archean tectonics model with significant crustal contamination in the source. Magma driven by mantle diapir has been injected at the base of the continental crust and the heat induces the partial melting of the overlying crust giving rise to mixed liquids. This magma now enriched in LILE was immediately drained to the upper crust to form the mafic rocks from the studied area.

关键词： Doropo Mafic Intrusive Birimian Crustal Contamination

Comparative Petro-Geochemistry of the Intrusive Granitoids of the ComoéBasin and the Granitoids of the Ferkessédougou Batholith (Côte D’Ivoire, Man-Leo Shield): Geodynamic Implications for the West African Craton (WAC)

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Journal of Geoscience and Environment Protection 2022年第7期10卷 98-118页

作者： Tokpa Kakeu Lionel-Dimitri Boya Allou Gnanzou Aristide Ghislain Beugré Dago Nahoua Silue Koffi Raoul Teha alain nicaise kouamelan Laboratory of Geology Mineral and Energy Resources/Training and Research Unit in Earth Sciences and Mineral Resources Félix HOUPHOU&#203 T-BOIGNY University Abidjan C&#244 te d’Ivoire Ministry of Mines Petroleum and Energy Duékoué Regional Directorate Duékoué C&#244 te d’Ivoire

The study of Birimian granitoids is of great importance because it allows us to understand the architecture of the West African crust and the processes that shaped it. In order to contribute to the improvement of knowledge on the geodynamic context of the emplacement of certain granitoids of the West African craton, this article addresses some essential problems of the Birimian, namely distinguishing the real nature of the magmas and the mechanisms that generated this Birimian crust. On the West African craton, there are intrusive granites in volcano-sedimentary furrows, in meta-sedimentary basins and granites that form batholiths separating these structures. To provide an answer to this scientific concern, we conducted a comparative study of the granitoids of the Comoé basin (Tiassalé region) and those of the large batholith of Ferkessédougou (Daloa region). From this study, it appears that these Birimian granitoids have been identified as granites, granodiorites and tonalites in the Tiassalé region while in Daloa, they are assimilated to anatexites and granites. They present very diverse aspects and contexts of emplacement: the granitoids of the Comoé basin have characteristics of type I granite, indicating direct crystallization of mantle magmas in a syntectonic emplacement, while in the Daloa region, some granitoids are magmatic, others migmatitic or metasomatic, reflecting a certain complexity relating to their genesis.

关键词： Petro-Geochemistry Birimian Granitoid Comoé Basin Ferkessédougou Batholith Côte d’Ivoire

Geochemical Exploration of Sediments in the Toumodi Region: Origin of Metasediments, Geological Dynamics, and Perspectives for Regional Geological History

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Open Journal of Geology 2023年第12期13卷 1255-1270页

作者： N’dri Eudes Sati Tegan alain nicaise kouamelan Alphonse Kouakou Yao Ouattara Gbele Ziandjêdé Hervé Siagne Koffi Aléxis N’Dri Department of Civil Engineering Geosciences and Geographic Sciences INP-HB Yamoussoukro C&#244te d’Ivoire Laboratory of Geology Mineral and Energy Resources/Training and Research Unit in Earth Sciences and Mineral Resources Félix Houphou&#235t-Boigny University Abidjan Ivory Coast

The region of Toumodi, located in the heart of the West African Craton, is renowned for its geological complexity. This geochemical study delves into the origin of siliciclastic sediments and the geodynamic context of their formation. The study reveals that Toumodi’s sediments exhibit an intriguing mineralogical composition, with indications of a dual source of parent rocks, one rich in quartz and the other poor in quartz. Furthermore, geochemical analysis highlights a variation in sediment maturity from west to east, indicating the coexistence of distinct geotectonic environments in the region. In the eastern part of the Toumodi region, a passive margin is defined characterized by sediments with an abundance of quartz, while to the west, an active margin is observed with sediments having a lower quartz content. This arrangement suggests the presence of a potential suture zone in the region. This geological complexity underscores the importance of further research to better understand the origin of sediments and the processes that have shaped them. Moreover, this study sheds new light on the fascinating geology of Toumodi, but many questions remain to be explored.

关键词： Toumodi Birimian Siliciclastic Sediments Sediment Maturity

Geochemical Signatures of Séguéla Peridotites in the West African Craton

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Journal of Geoscience and Environment Protection 2022年第12期10卷 100-116页

作者： Allialy Marc Ephrem Dicko Kagou Houssou N’guessan Nestor kouamelan alain nicaise Coulibaly Yacouba Laboratory of Geology Mineral and Energy Resources (LGRME) Faculty of Earth Science and Mineral Resources Félix Houphoue&#235 t Boigny University Abidjan C&#244 te d’Ivoire

The present study deals with peridotites found in the paleo-proterozoic domain of the Leo Man Shield, Séguéla region, west-central of Côte d’Ivoire. Results show that Séguéla peridotites are composed of lherzolites, dunites and harzburgites. However, iherzolites are the most abundant. The phenocrysts in these rocks are olivine most often serpentinised, and pyroxenes, represented by diopside and enstatite. Amphiboles are divided into two groups: magmatic amphiboles and those from the destabilization of clinopyroxene. Spinels have CrO3 content which varies between 28% and 37%, Al2O3 between 33% - 41% and MgO is equal to 18%;they are poor in TiO2 and do not contain zinc oxide. Séguéla peridotites are characterised by a negative anomaly in Nb-Ta, associated with an enrichment of lithophilic elements and light rare earth elements with a fractionation rate (La/Yb) which varies between 46.22 and 150.72 and heavy rare earth elements, and HFSE depletion, which may suggest that were formed in an art context, that is, a mantle enriched by fluids from a subduction zone. However, another hypothesis could be considered, that of the interaction between the mantle and magmas in a subduction zone context.

关键词： Geochemestry Peridotites Lherzolite West African Craton Séguéla Côte d’Ivoire

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

Valorization of Cucurbita pepo Seed Oil in Soap Production

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Green and Sustainable Chemistry 2022年第4期12卷 104-117页

作者： Guy Crépin Enoua Aristide H. W. Nakavoua Victor N’goka Tony Wheellyam Pouambeka Prince Maho Diafouana Mahoungou Narcisse nicaise Obaya alain Brice Mbozo Vouidibio Hubert Makomo Robin Pascal Ongoka Analytical Chemistry and Bioactive Substances Team Faculty of Science and Technology Marien Ngouabi University Brazzaville Republic of Congo Department of Natural Sciences Normal High School Marien Ngouabi University Brazzaville Republic of Congo Laboratory of Natural Substances Chemistry (IRSEN) Brazzaville Republic of Congo Cellular and Molecular Biology Laboratory (BCM) Marien Ngouabi University Brazzaville Republic of Congo

The present study was conducted with the aim of extracting and characterising Cucurbita pepo seed oil and then producing soap with important dermatological properties. The physico-chemical results of the Cucurbita pepo seed oil after extraction were satisfactory and indicate that the oil obtained contains long-carbonaceous fatty acids. The production of the soap was based on the realisation of a saponification reaction by reflux heating between the extracted oil and a solution of soduim hydroxyde 7M for one hour. The soap obtained is characterised by the following physico-chemical parameters: salt content, alkali content, pH, and humidity;which meet ISO 684-1974 standards. The antibacterial parameters of the soaps S1, S2, S3, S4, S5 and S6 were determined by the Agar Diffusion test using the well method and these soaps showed an interesting antibacterial activity against the germs pseudomonas aeruginosa and staphylococcus aureus. Soaps based on Raffia sese oil (kolo oil) and Elaesis guineensis oil (palm oil) have also been synthesized for comparison with soap obtained from Cucurbita pepo seed oil.

关键词： Valorization Cucurbita pepo Seeds Cucurbita pepo Oil Soap Antibacterial Activity