by Ndengwe Alexander Tangwa, Njoh Oliver Anoh and Nowel Yinkfu Njamnsi
Original Research
The geotechnical and compositional characteristics of mudrock deposits in the Douala Sub basin were investigated using a combination of analytical methods, including particle size distribution, Atterberg limits, mineralogical (X-ray diffraction) analyses, and whole rock geochemistry. The goal is to characterize the nature and physicochemical properties of mudrock in order to determine its applicability in industries. Grain size analysis reveals that clay-sized particles dominate the samples, with a plasticity index ranging from 6.8% to 20.67%. The mudrock materials are primarily composed of kaolinite (16.8-49.4%), quartz (15.8-68.9%), and illite (00-15.3%), which are typical of the Douala Sub- basin sedimentary environment and morphoclimatic conditions. SiO2 (42.77-73.5%) and Al2O3 (13.13-29.98%) are the most abundant oxides in the samples. Iron oxide content is moderate (1.73- 17.18%). Methylene blue values range from 1.12 to 6.95, confirming the clay content of (39.43-45.43%) and also attesting that the sediments in the study area are rich in 1:1 clay. They are suitable for ceramic applications such as (refractory bricks and tiles) and pottery due to the physicochemical parameters associated with mineralogical and geochemical data
Journal of Geosciences and Geomatics. 2022, 10(3), 162-171. DOI: 10.12691/jgg-10-3-5
Pub. Date: December 12, 2022
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by Zié Ouattara, Gnamba Franck Emmanuel Gouédji, Gbélé Ouattara, Koffi Olivier Kanga, Olivier Moro Boffoué and Yacouba Coulibaly
Original Research
The Birimian furrow of Toulépleu-Ity located in the Archaen domain of Côte d'Ivoire is at the heart of various mining projects. Thus, this study is initiated in three localities namely Toulepleu, Zogouiné and Guéya in order to elucidate the petrography and deformations. The data analysis and interpretations undertaken at the University of Man allow to learn deeply this Birimian furrow. Petrographically, two main groups of rocks are identified: (i) magmatic comprising granodiorite, microgranodiorite, tonalite and dolerite, (ii) metamorphic composed of gneissisified granodiorite, metatonalite, metaargilite, metadolerite and various schists (chloritoschists). Argillite is the main sedimentary rock. The metamorphism evolves from greenschist to amphibolite facies overprinted by the chlorite - green hornblende association. Eburnean magmatic event has been ended with the settlement of dolerite which appears metamorphosed and fractured suggesting the reactivation of the Eburnean event. Pervasive hydrothermal alteration is marked by mylonitized quartz veins. Structurally, three main orientations are expressed : N-S, NE-SW and NW-SE. Ductile deformations are observed in schists, metatotalites and metasediments. The schistosity planes have a dip of 44°S. Brittle deformations have a preferential NE-SW orientation and are associated with quartz plus tourmaline veins showing by that their auriferous potentiality. These structures are part of a shearzone of N080° that can serve as a target for gold exploration in the area.
Journal of Geosciences and Geomatics. 2022, 10(3), 153-161. DOI: 10.12691/jgg-10-3-4
Pub. Date: November 22, 2022
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by T. K. Lionel-Dimitri Boya, Martial P. K. Adingra, Allou Gnanzou, Gbele Ouattara, Apo Ryana L. Diane and Yacouba Coulibaly
Original Research
The Toumodi-Fètêkro belt in Côte d'Ivoire is a one of its greenstone belts which has given rise to several mines in operation, with research or development work still in progress. This study based on a compilation of existing data acquired in different sectors, aims to contribute to the improvement of knowledge on the granitoids of this area. The geochemical data have therefore been reprocessed with a view to a global interpretation of the entire belt. Terranes are formed by granodiorites, granites, granophyres and tonalites with granodiorite and granophyres like host rocks. The peraluminous and metaluminous nature of magma shows that the granitoids come from mantle and crustal sources, with type I and S granites. The main anomalies noted indicate for these granitoids a character typical of volcanic arc magmas, an enrichment in K, or even a continental source. The deposits known in the Toumodi-Fètêkro belt are linked to several hydrothermal alterations. The control of the mineralization is litho-stuctural, with hydrothermalism being of major importance.
Journal of Geosciences and Geomatics. 2022, 10(3), 139-152. DOI: 10.12691/jgg-10-3-3
Pub. Date: October 10, 2022
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by Kankao Oumar Oumla, Ngon Ngon Gilbert François, Tehna Nathanael, Bayiga Elie Constantin, Mbog Michel Bertrand, Mbaï Joel Simon and Etame Jacques
Original Research
This study is focused on the physicochemical and mineralogical characterization of five different clay materials of Eastern part of Douala sub-basin. It aims to know the nature and geotechnological properties of the clay raw materials in order to raise the idea of their potentialities in industrial applications. The samples were subjected to several analyses such as geotechnical tests notably the particle size distribution, the Atterberg limits, the swelling index, the chemical (cation exchange capacity, pH-H2O and pH-KCl, X-ray fluorescence) and mineralogical (X-ray diffraction) analyses. These clay materials showed high fine fractions (up to 99%) and high plasticity index (15 to 63%). The swelling index is medium (16 to 20) and the CEC moderate (30 - 40), indicating the presence of a small proportion of swelling 2:1 type clays. The clay materials are predominantly constituted by kaolinite (32 – 72%), quartz (20.2 - 50.7%) and illite (4.6 – 10%), which are characteristic of the sedimentary environment and morphoclimatic conditions of the Douala coastal sedimentary sub-basin. The predominant oxides in clay materials are SiO2 (34.05 - 51.18%) and Al2O3 (16.05 - 23.98%). Iron oxide Fe2O3 is moderate (1.55 - 11.22%) and alkali and alkaline earth oxides are weak less than 2%. The physicochemical parameters associated with mineralogical and geochemical data make them suitable for ceramic applications and also serve as backfilling materials in building constructions when improved by adding sand.
Journal of Geosciences and Geomatics. 2022, 10(3), 126-138. DOI: 10.12691/jgg-10-3-2
Pub. Date: July 17, 2022
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by Cedric Roth Happi Djofna, Merlain Houketchang Bouyo, Daouda Dawai, Rigobert Tchameni, Landry Kouedjou, Martial Periclex Tchunte Fosso and Hervé Brice Fotso Kengne
Original Research
This article presents original geological and geochemical data on more or less deformed granitoids rocks of the Pitoa region in Domain North Cameroon. The Pitoa granitoids consist of leucocratic, gray and pink colored, fine to medium grained granites as well as quartz monzonite, containing numerous enclaves of mafic rocks, intruded in gneiss and amphibolite and cut by dykes of pegmatite, aplite and dolerite. They present porphyritic, inequigranular, granophyric and microgranophyric textures consisting essentially of quartz, K-feldspar, plagioclase, biotite and the accessory minerals are zircon, apatite, titanite and opaque minerals. The Plutonic rocks of Pitoa show the characteristics of the shoshonitic and calc-alkaline series with high-K content. They are magnesian to ferrous, luminous to slightly hyper-luminous metallic and exhibit the characteristics of type 1 granitoids. REE data and normalized chondritic plots show variable enrichment of all rocks in LREE compared to HREE with a negative europium anomaly (Eu/Eu*= 0.19 – 0.8), except for the pink granite sample DS15 which shows a positive Eu anomaly (14.6). They are distinctively depleted in Th, Nb, Ba, Sr, Ti and Ta. The data indicate that this assemblage of granitic rock did not result from the simple differentiation of a common parental magma, but show that the plutonic rocks of Pitoa arose from different crustal protoliths. Trace element and major composition are consistent with the magmatism which may have involved reworking of a composite protolith of metagrey-wackes in the upper crust and amphibolitised high -K calc-alkaline basaltic andesites in the northern domain of the Orogenic belt from Central Africa. These granitoids were set up in a tectonic context of continental subduction collision. They are emplaced in the active continental margin and fractional crystallization (FC) is a major process that controls magmatic differentiation.
Journal of Geosciences and Geomatics. 2022, 10(3), 112-125. DOI: 10.12691/jgg-10-3-1
Pub. Date: June 26, 2022
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