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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

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

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

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

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

Structural Pattern Related to Gold Mineralization in the Essakane Area (Northern Burkina Faso, West African Craton)

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Open Journal of Geology 2024年第9期14卷 855-879页

作者： Marc Desire Valea Benjamin Sawadogo Kalidou Traoré Urbain Wenmenga Naba Seta Benjamin allou Laboratoire Gosciences et Environnement (LaGE) Dpartement des Sciences de la Terre Universit Joseph Ki-Zerbo Ouagadougou Burkina Faso Essakane Sarl IAMGOLD Corporation Ouagadougou Burkina Faso Laboratoire de Godynamique et de Cartographie Universit des Sciences des Techniques et des Technologies de Bamako Bamako Mali

The finite deformation structures recorded in the Essakane area, located in the northeast corner of Burkina Faso, highlight three major compressive deformation phases, successively named D1, D2, and D3. The D1 event phase, trending NE-SW, is characterised by P1 folds and S1 axial plane schistosity. The D2 phase trending NW-SE is characterised by folds P2, schistosity (S2) and shear (C) planes. And the D3 phase trending NNE-SSW to N-S is characterised by P3 folds, crenulation microfolds and S3 spaced schistosity. It has also been noted that gold mineralizations are mainly hosted in quartz, carbonate, pyrite, and arsenopyrite veins. Structural interpretation indicates that these veins are organized into lenticular bodies that were formed during the first two deformation phases (D1 and D2). This suggests a strong structural control typical of orogenic gold concentrations.

关键词： Burkina Faso Essakane Shear Zone Deformation Phases Orogenic Gold

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

象牙海岸Issia地区铌钽砂矿的研究(英文)

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大地构造与成矿学 2008年第2期32卷 195-211页

作者： Benjamin A allou Huanzhang LU Jayanta GUHA Jacques CARIGNAN Centre d＇études sur les Ressources Minérales Université du Quebec à Chicoutimi 555 Bd de l＇ Université Chicoutimi Québec Canada G7H2B1 Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 Guangdong China

在西非的象牙海岸Issia地区分布着许多铌钽矿床,包括原生矿和砂矿。原生矿产在分带很好的伟晶岩中。这个地区发育着许多花岗岩和花岗伟晶岩。伟晶岩可分为:(1)分异不好的伟晶岩,无矿化;(2)含Be伟晶岩,分带较好,见绿柱石;(3)含Be-Nb-Ta... 详细信息

在西非的象牙海岸Issia地区分布着许多铌钽矿床,包括原生矿和砂矿。原生矿产在分带很好的伟晶岩中。这个地区发育着许多花岗岩和花岗伟晶岩。伟晶岩可分为:(1)分异不好的伟晶岩,无矿化;(2)含Be伟晶岩,分带较好,见绿柱石;(3)含Be-Nb-Ta的伟晶岩,分带很好,是矿体;(4)Be-Nb-Ta-Li伟晶岩,分带很好,是矿体。除了10多个原生矿外,还有许多砂矿。砂矿有两种类型:一种近原生矿的坡积砂矿,另一种是经河流冲刷搬运后的冲积砂矿。我们选择了Etienne-Meguhe砂矿作为近原生矿的坡积砂矿的代表,Bemadi矿作为河流冲积型的砂矿的代表,对这两种类型的砂矿的风化、搬运、沉积机理进行了比较研究。研究发现不同的搬运距离和搬运模式对铌钽砂矿的主要矿物——铌钽铁矿的化学性质没有什么影响,而其物理形态则发生了变化。坡积型砂矿的铌钽铁矿常与石英、长石等矿物连生,其颗粒大小与原生的Nb-Ta伟晶岩中的铌钽铁矿一致;经河流冲积而形成的砂矿中,铌钽铁矿颗粒变小、轮廓变得圆滑,几乎无连生矿物,但矿体集中,常在河流的冲积扇中分布,易开采。

关键词：铌钽砂矿坡积砂矿冲积砂矿象牙海岸

Adsorption Kinetics and Thermodynamics Study of Butylparaben on Activated Carbon Coconut Based

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Journal of Encapsulation and Adsorption Sciences 2018年第2期8卷 39-57页

作者： Patrick Atheba N’Guadi Blaise allou Patrick Drogui Albert Trokourey Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada Laboratoire de Chimie Physique Université Félix Houphou&#235 t Boigny de Cocody-Abidjan Abidjan C&#244 te d’Ivoire Advanced Materials Group Materials Science and Technology Division CSIR-NEIST Jorhat India

In this work, low cost coconut biochar based activated carbon (CBAC) was used for adsorption of Butylparaben (BPB) from aqueous medium. The prepared CBAC was characterized using BET, Boehm analysis and the adsorption equilibrium, kinetics and thermodynamics studies of BPB adsorption were carried out. During batch adsorption runs, the effects of factors, such as contact time (0 - 300 min), CBAC dose (200 - 800 mg), pH (3 - 11) and solution temperatures (303 - 348 K) were investigated on BPB removal. Experimental results reveal that the BPB removal efficiency on CBAC is higher than 97% under acidic and neutral conditions. Equilibrium data were fitted by Langmuir, Freundlich and Temkin isotherm models with correlation coefficient more than 0.9. The pseudo-second order kinetic model was observed to fit well the adsorption data. Thermodynamic analysis shows positive values of standard Gibb’s free energy, suggesting the non-spontaneity of the process. The changes in enthalpy (0.2 ***-1) and entropy (19 ***-1) were found to be endothermic with an increase of randomness. The high adsorption efficiency of the synthesized coconut biochar materials with low cost indicates that it may be a promising adsorbent for removing organic compounds.

关键词： Coconut Shell Activated Carbon Adsorption Butylparaben Kinetics Isotherm