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Journal of Geoscience and Environment Protection 2022年第9期10卷 136-148页

作者： Gbele Ouattara Gnammytchet Barthélémy Koffi allou gnanzou Kouakou Alphonse Yao Laboratory of Civil Engineering Geosciences and Geographic Sciences National Polytechnic Institute Félix Houphou&#235 t-Boigny Ya-moussoukro Ivory Coast Laboratory of Geology Basement and Metallogeny UFR-STRM Félix Houphou&#235 t-Boigny University Abidjan Ivory Coast

Ivory Coast is a country rich in base metals and precious minerals: gold, manganese, diamond, iron, bauxite, cobalt and nickel. These natural resources are exposed to destruction and fragmentation by mining activities. The artisanal and small-scale exploitation of gold are increasingly practiced in our rural areas. These activities escape often in the control and monitoring of the mining administration. In order to better constrain these activities on the environment, the present work used remote sensing imageries to see its spatio-temporal impacts in the rural world in central Ivory Coast. The results show that gold artisanal activities have been practiced since 2013 and are experiencing an increasingly important growth. We note a devastation of forests and savannahs, a pollution of surface water, as well as an increase in poverty in rural areas. These activities are practiced near habited areas (villages). This creates a reduction of cultivatable soil. Remote sensing imageries make it possible to quickly map areas at large-scale gold mining in time and space.

关键词： Gold Panning Artisanal Mining Space and Time Remote Sensing Imageries Ivory Coast West Africa

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

The Geological Formations of Koun Fao (East of Côte d’Ivoire): Petrographic Characterization and Associated Deformations

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Open Journal of Geology 2022年第10期12卷 787-810页

作者： Tokpa Kakeu Lionel-Dimitri Boya Fossou Jean-Luc Hervé Kouadio allou gnanzou Martial Pohn Koffi Adingra Odrouro Ablan Anne Marie Kouame Marc Ephrem Allialy Laboratory of Geology Mineral and Energy Resources/Training and Research Unit in Earth Sciences and Mineral Resources Félix Houphou&euml t-Boigny University Abidjan C&ocirc te d’Ivoire

This study aims to contribute to improve knowledge on geological formations of Comoé basin. The petrographic study of the geological formations of Koun Fao has highlighted two major lithological families: magmatic rocks consisting of monzonites, monzogranites, diorites, biotite granodiorites, syenites, porphyritic micromonzonites and porphyritic dacite and metamorphic rocks from sedimentary origin (quartz schists, meta-greywackes, schists, andalusite chloritoschist and paragneiss). These formations are affected by amphibolite to greenschist facies metamorphism and hydrothermal alteration (pervasive and vein) marked by the presence of quartz, epidotes, chlorites and sericite. Minerals such as andalusite, muscovite and chlorite characterize a local low pressure contact metamorphism in the andalusite chloritoschist. Remote sensing data (Landsat 8 image) coupled with field data allowed the production of a geological map of the area. The study of the structures and microstructures highlighted two deformation mechanisms. These are flattening and simple shear (ductile and brittle). The study area is affected by four deformation phases: D1 marked by a N-S to NNE-SSW elongation, D2 marked by a NW-SE to NNW-SSE compression phase, D3 which is a NE-SW to NNE-SSW transpression phase and D4, responsible for late structures, marked by a NW-SE to NNW-SSE transpression phase.

关键词： Petro-Structural Geological Formations Comoé Basin Koun Fao Côte d’Ivoire

Metallotectic Context of the Mineralization of the Tondabo Gold Prospect(Brobo,Center of Cote d’Ivoire,West Africa)

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International Journal of Geosciences 2020年第5期11卷 325-344页

作者： DaI Bi Seydou Mathurin Ouattara Gbele gnanzou allou Koffi Gnammytchet Barthelemy Coulibaly Inza Laboratoire des Geosciences Cadre de vieEnvironnement et Sciences GeographiquesInstitut National Polytechnique Felix Houphouet-BoignyYamoussoukroCote d’Ivoire Laboratoire de Geologie du Socle et Metallogenie UFR-STRMUniversite Felix Houphouet-BoignyYamoussoukroCote d’Ivoire

The gold mineralization of the Tondabo prospect, located in the northern part of the Oumé-Toumodi-Fettêkro greenstone belt, is mainly hosted in the rhyodacite and to a lesser extent in the mafic volcanics (volcanic lavas and volcanoclastites). These rocks were affected by a hydrothermal alteration marked by quartz veins and veinlets associated with crystals of carbonates, sericite, epidote and sulfides. This hydrothermal alteration induced a pervasive alteration of the surrounding bodies with silicification, chloritization, carbonation and sericitization of the feldspars. The metalliferous paragenesis contains an abundant pyrite, with rare pyrrhotite and chalcopyrite. This mineralization indicates that the Tondabo gold prospect exhibits lithological control. The mineralized deposits are generally affected by a S1 schistosity oriented mainly N000-010° and minority N040-050° with a general dip of 60°-80°to the West;however with rare N-S orientations with a dip of 60°-80° to the East. The drilling intervals show that the highest gold contents are linked to the quartz-carbonates veins and veinlets, which are located in the highly deformed zones, characterizing local shear zones.

关键词： Gold Mineralization Rhyodacite Structures Hydrothermal Alteration Tondabo Cote d’Ivoire

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

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

Distribution and Characterization of Heavy Metal and Pollution Indices in Landfill Soil for Its Rehabilitation by Phytoremediation

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Journal of Geoscience and Environment Protection 2022年第1期10卷 151-172页

作者： Kraidy N’gattah Barthélémy Armel Bolou Bi Bolou Emile allou Kouassi Daniel Université Félix Houphouë t-Boigny Unité de Formation et Recherche des Sciences de la Terre et des Ressources Minières Laboratoire des Sciences du Sol de l’Eau et des Géomatériaux (LSSEG) Abidjan C&#244 te d’Ivoire

Population growth associated with urban development in African cities is a key environmental concern in development programs. Indeed, urban areas are strongly impacted by the production of municipal waste, the management of which remains problematic and is only stored in open dumps. This is the case in the city of Bonoua, a small town located 59 km east of Abidjan in the South Comoé region of Côte d’Ivoire. The management of municipal waste in this town is crucial because all the mineral water sources are concentrated in this town. The objective of this study is to characterize and map the distribution of trace metal elements in the largest urban landfill in the city in order to propose an efficient strategy for rehabilitation into an urban park. Soil samples were collected from the entire site (landfill and surrounding soil) and from a control site. The total content of trace metals (Pb, Cd, Cr, and Zn) in the soil was analyzed by X-ray fluorescence spectrometry (XRF). Soil pollution was evaluated through enrichment factors, geoaccumulation indices and pollution indices. The results show that the calculated geoaccumulation indices and their distribution maps indicate a pollution of the site in these elements. The values of the PI higher than the unit reveal a pollution of the site in several elements. The levels of Pb, Cd, Cr and Zn are higher than the levels in the upper continental crust and in the control soil. The spatial distribution shows a significant accumulation of Pb, Cr and Zn on the landfill while Cd is concentrated in the surrounding soils. The calculated enrichment factors suggest an anthropogenic origin of the heavy metal at the study site. These results indicate polymetallic pollution by metals that can persist in the environment and affect human health.

关键词： Municipal Landfill Soil Heavy Metals Pollution Bonoua Ivory Coast

Production and Characterization of Green Biosorbent Based on Modified Corn Cob Decorated Magnetite Nanoparticles

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Journal of Materials Science and Chemical Engineering 2023年第2期11卷 1-12页

作者： N’guadi Blaise allou N’goran Sévérin Eroi Mougo André Tigori Patrick Atheba Albert Trokourey Laboratoire de Constitution et Réaction de la Matière UFR SSMT Université Félix Houphouët Boigny Abidjan Côte d’Ivoire Laboratoire de Thermodynamique et de Physico-Chimie du Milieu UFR SFA Université Nangui Abrogoua Abidjan Cote d’Ivoire Laboratoire des Sciences et Technologies de l’Environnement UFR Environnement Université Jean Lorougnon Guédé Daloa Côte d’Ivoire Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada

In most developing countries, particularly in the countries of sub-Saharan Africa, corn cobs are considered as waste polluting the environment during the harvest period of this cereal. In order to valorize this agricultural waste, high-performance, inexpensive and low-energy consumption magnetic bioadsorbents were prepared from corn cobs. The chemically activated raw corn cob was magnetized by coating the surface with magnetite nanoparticles. The prepared biosorbents were characterized by FT-IR, XRD, FE-SEM associated with EDX, HR-TEM, TG analysis, BET surface area analysis and XPS. The maximum specific surface area of 35.22 m2/g was reached. An attempt to use of these magnetic biosorbents for the removal of heavy metal like Cr(VI) from aqueous solution was envisaged.

关键词： Green Biosorbent Corn Cob Magnetite Nanoparticles Surface Chemistry NaOH Activation

Physic, Chemical and Mineralogical Characterizations of Clays Used in the Making of Traditional Ceramics in the City of Katiola, C ôte d’Ivoire

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Journal of Minerals and Materials Characterization and Engineering 2023年第4期11卷 81-91页

作者： Isabelle Linda He Grah Patrick Atheba N’guadi Blaise allou Patrick Drogui My Ali El Khakani Gildas Komenan Gbassi Laboratory of Analytical Sciences and Public Health Training and Research Unit of Pharmaceutical Sciences and Biological University Félix Houphou&#235t Boigny Abidjan C &#244te d’Ivoire Laboraratory of Constitution and Reaction of Matter Unit for Training and Research in the Sciences of the Structures of Matter and Technology University Félix Houphou&#235t Boigny Abidjan C &#244te d’Ivoire Center Water Earth Environment National Institute for Scientific Research Quebec Canada Center Energy Materials and Telecommunications National Institute for Scientific Research Varennes Canada

In C ?te d’Ivoire, traditional ceramics are widely used in the form of pottery. The latter is used to store food, water and cereals. Analyzes (X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductive plasma optical emission spectrometry (ICP-OES), scanning electron microscopy (SEM) and analysis thermal gravimetric (ATG)) were carried out to determine the morphology, the chemical, physical and pedological constituents of these raw materials. It appears from this study that the clays used in the Mangoro pottery of Katiola contain silica SiO2, alumina Al2O3 and iron oxide Fe2O3 as well as kaolinite, muscovite, smectite and quartz.

关键词： Ceramics Characterization Clays Kaolinite Muscovite Smectite Quartz

Infantile Hemangiomas: Epidemio-Clinical Profile and Therapeutic Difficulties in Côte d’Ivoire

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Journal of Cosmetics, Dermatological Sciences and Applications 2017年第4期7卷 362-367页

作者： Ahogo Kouadio Celestin allou Ange Sylvain Golli Blaise Kanga Kouamé allou Konan David Department of Dermatology CHU of Treichville Abidjan Cote d’Ivoire

Introduction :Infantile haemangiomas are the most common benign vascular tumours of infants. In Western countries, they have been the subject of several studies. However, in sub-Saharan Africa, few works are devoted to them. We initiated this work to contribute to a better knowledge of infantile haemangiomas in our work context. Material and Methods: This is a cross-sectional descriptive and analytical study carried out in the Dermatology Department of C.H.U. Treichville from November 2014 to December 2016;All children with infantile haemangiomas have been taken into account, in the study. Results: We counted 42 cases of haemangiomas on 4600 paediatric dermatoses, a prevalence of 0.9%. The sex ratio was 0.35. The age of our patients ranged from 2 days to 5 years. 76.2% of patients consulted after the age of 2 months. 26.9% of patients were born premature. 54% of the haemangiomas started with an erythematous macula. 52.4% had a size between 1 and 3 cm. Superficial haemangiomas (52.38%) and mixed haemangiomas (42.85%) were the most common clinical forms. The ulcerated forms represented 9.5%. The lesions were preferentially located in the cervico-facial region (71.4%) and resulted in aesthetic prejudice in 47% of cases. 3 patients (7.14%) were treated with propranolol. 37 patients (88.1%) used self-medication using poultice. Conclusion: Infantile haemangiomas are infrequent in Cote d’Ivoire. They sit mainly in the cervico-facial area. The ulcerated forms are not negligible and they sometimes cause a significant aesthetic prejudice. Their management is sometimes difficult because of the unavailability of propranolol.

关键词： Haemangiomas Children Cote d’Ivoire