ST
Professeur
Scientific activity
Researcher profile
Faculty researcher at the University of Yaoundé I. Grade: Professeur.
Scientific publications
Franck Wilfried Nguimatsia Dongmo, Percy Samwagah, Nga Essomba Tsoungui Philomèn Estelle, Aurélie Ngamy Kamwa, Marc Kamgaa, Roger Firmin Donald Ntouala and 1 more
SSRN Electronic Journal
Christopher Fuanya, Boniface Kankeu, Anthony Temidayo Bolarinwa, Rose Fouateu Yongué
Advances in Applied Sciences
The Ako’ozam–Njabilobe area, which is part of the Nyong group, is characterized mainly by highly deformed gneisses that host amphibolites, and metadolerites as enclaves. The gneisses within the Ako’ozam-Njabilobe area were investigated to constrain their geotectonic environment as well as understand their geodynamic evolution within the Nyong group. Three litho-types of gneisses outcrop within the Ako’ozam-Njabilobe area, consisting of horblende-biotite, quartzofeldspathic, and garnet gneisses. They are strongly peraluminous, with low Yb<SUB>N</SUB>, Rb/Sr, K<sub>2</sub>O/Na<sub>2</sub>O, and enriched in large ion lithophile elements (LILE). The gneisses within the Ako’ozam-Njabilobe area have a trachy-andesite parentage. The negative anomalies in high field strength elements (HFSE) and enrichments in LILE and light rare earth elements (LREE) suggest a subduction setting for this magmatism. The geochemical signatures including, low K<sub>2</sub>O/Na<sub>2</sub>O ratio, silica content (67.18 to 73.65 wt%), Yb and Y contents less than 1 and 10 ppm respectively, and low heavy REE values of the studied gneisses are akin to chemical signatures of archean crustal rocks. The Nb/Th < 1 and Th/Yb >1 of the studied gneisses indicate that the magma that sourced their protolith is mantle-derived with some degree of crustal contamination. The similarity in whole rock data of the three lithotypes of gneisses within the Ako’ozam-Njabilobe area suggests a possible mechanical mixing during emplacement. The chemistry of the gneisses indicates a possible Archean inheritance during the emplacement of their protoliths, as such could provide insights into the petrogenetic processes controlling crustal growth and aid in understanding the Archean-Proterozoic transition within the Nyong group.
Agoubli Issiné, Désiré Tsozué, Aubin Nzeugang Nzeukou, Rose Fouateu Yongué, Bertin Pagna Kagonbé
Applied and Environmental Soil Science
In recent decades, many regions in the Chad Republic in Central Africa have experienced a continuous decline in agricultural yields. In order to determine the main factors leading to this decline in yields and mainly Sorghum yields, this study was conducted in South-Western Chad, in the Sudano-Sahelian environment. Three soil profiles of variable depths, namely, M1, M2, and M3, were dug along a toposequence, respectively, in the footslope, mid-slope, and the upslope. Soil samples collected from each horizon in the three soil profiles were labelled and sent to laboratories for mineralogical, geochemical, and physicochemical analyses. For land evaluation, climatic characteristics are divided into rating groups with respect to the crop and its climatic requirements. Parametric values were attributed to each soil characteristic for soil evaluation and the land index calculated. The main minerals identified in the studied soils are quartz, K-feldspars, plagioclase, kaolinite, smectite, illite, associated to traces of anatase, sepiolite, calcite, and interstratified minerals. In all the analyzed samples, silicon content is very high. It is closely followed by aluminum, iron, and potassium. The presence of kaolinite and smectite suggests that monosiallitisation is a crystallochemical processes acting at the bottom of profile towards bisiallitisation. All samples collected from the three soil profile horizons are mainly sandy and globally poor in nutrients. The pedoclimatic assessment of Sorghum cultivation reveals that the studied soils are marginally to moderately suitable for the production of Sorghum due to soil texture, wetness, and soil fertility. The decline in yields is related to low base saturation, in line with low exchange base content in the studied soils. These limitations could be solved by restoration of the cation balance through fertilization and liming, combining organic inputs with mineral fertilizer, and the realization of channels for the drainage of water at the base of the soil sequence.
Durane Tchatchouang Chougong, Gabriel Ngueutchoua, Emmanuel Henock Dicka, Armel Zacharie Ekoa Bessa, Gisèle Flodore Youbouni Ghepdeu, Ulrich Joël Filicien Bilounga and 3 more
Earth Systems and Environment
Durane Tchatchouang Chougong, Armel Zacharie Ekoa Bessa, Gabriel Ngueutchoua, Rose Fouateu Yongué, Sylvie Carole Ondo Ntyam, John S. Armstrong‐Altrin
Journal of African Earth Sciences
Franck Wilfried Nguimatsia Dongmo, Rose Fouateu Yongué, Anthony Temidayo Bolarinwa, Ralain Bryan Ngatcha, Christopher Fuanya, Marc Anselme Kamga
Advances in Science, Technology & Innovation/Advances in science, technology & innovation
Christopher Fuanya, Anthony Temidayo Bolarinwa, Boniface Kankeu, Rose Fouateu Yongué, Emmanuel Tangko Tangko, Franklin Yetedje Nkepguep
SN Applied Sciences
Amadou Pountouenchi, D. Njoya, André Njoya, D. Rabibisao, Jacques Richard Mache, Rose Fouateu Yongué and 4 more
Clay Minerals
ABSTRACT Three clayey materials named MY3, KK and KG originating from the Foumban region (west Cameroon) were analysed to determine their granulometry, plasticity, major-element chemistry and mineralogy. Dilatometric and ceramic behaviour were also investigated. Clays were shaped by uniaxial pressing in a steel mould. Shaped samples were heated at 1300, 1400 and 1500°C. The end products were characterized in terms of their density, porosity and compressive strength. Raw materials differ in terms of their mineralogical composition, grain-size distribution, Al 2 O 3 content and the nature and abundance of impurities inducing specific thermal behaviour during dilatometric analysis and sintering tests. The final material properties may be related to the main features of the raw materials used.
Franck Wilfried Dongmo Nguimatsia, Anthony Temidayo Bolarinwa, Rose Fouateu Yongué, Jean de Dieu Ndikumana, Jerry O. Olajide-Kayode, Olugbenga G. Olisa and 3 more
Open Journal of Geology
Gold occurs in a wide range of deposit types and settings. In the last decade, significant progress has been made in the definition, classification, characterization, thereby aiding understanding of the main gold deposit types. The present work aims to provide an update on the current state of knowledge on the different types of gold deposits models, geodynamics, their mode of formation and the condition suitable for their formation Several subsets of gold deposits are distinguished from one another on the bases of and their main geological models and their mode of formation described. Gold deposits of magmatic-hydrothermal origin are classified into Porphyry, Epithermal, Skarn, Iron Oxide-Copper-Gold and Intrusion related deposits; those of hydrothermal origin are Orogenic, Volcanogenic Massive Sulphide deposits, and Carlin-type; while those of Sedimentary Origin are placers. In terms of the major Period of gold deposit formation, the Mesoarchean was the largest gold period. Other gold peaks followed, particularly in the Neoarchean, Paleoproterozoic and Paleozoic while numerous and diverse gold deposit types were formed during the Cenozoic era.Wide varieties of geodynamic contexts in which each of the gold deposits are formed being explained while the conditions favourable for its formation are also being summarized. With the recent rise in the price of gold, mining companies and research centers continue to provide lighting of the key geology features of then ore-forming environments and the key geologic manifestations of the different deposit types.
Kemeng Paul Mbih, Sébastien Meffre, Rose Fouateu Yongué, Nguo Sylvestre Kanouo, Thomson Jay
Journal of African Earth Sciences
Arlin Bruno Tchamba, J.C. Sofack, Rose Fouateu Yongué, U.C. Melo
Journal of Asian Ceramic Societies
Three types of bauxites containing aluminum hydroxide of 58.1% gibbsite and 19.3% boehmite for BX3, 95.5% of gibbsite for BX55 and 84.5% of gibbsite for BX8 were used with lime at 95% of CaO through solid state sintering in one stage to prepare a refractory clinker at 1550 °C. The powder obtained after grinding the clinker showed in the XRD curves the presence of CaO·2Al2O3 and CaO·TiO2 phases in the cement samples. The density of cement powder varied between 2.95 and 3.17 g/cm3 and the specific area of powder obtained after grinding was between 0.72 and 0.85 m2/g. The properties of hydrated cement, W/C = 0.33, after stabilization of cement components for 48 h at 105 °C were showed by XRD, DTA, DTG and SEM (C3AH6, AH3, CA2 and CaO·TiO2). The Young's modulus of the cement made varied between 35.5 and 39.4 GPa, and these Young's moduli were compared to conventional CA14M cement.
Arlin Bruno Tchamba, U.C. Melo, Gisèle Laure Lecomte‐Nana, E. Kamseu, C. Gault, Rose Fouateu Yongué and 1 more
Ceramics International
Nguo Sylvestre Kanouo, Khin Zaw, Rose Fouateu Yongué, F L Sutherland, Sébastien Meffre, Emmanuel Njonfang and 1 more
Journal of African Earth Sciences
Nguo Sylvestre Kanouo, Rose Fouateu Yongué, Shouyu Chen, Emmanuel Njonfang, Changqian Ma, Tanwi Richard Ghogomu and 2 more
Journal of Geography and Geology
Greyish-black rutile megaclasts from the Nsanaragati gem placer in south western Cameroon display a wide range of lithophile and siderophile elements in LA-ICP-MS analyses. TiO2 abundances exceed 94 wt.%, with FeO (up to 4.2 wt.%), SiO2 (up to 1.5 wt.%) and Al2O3 (up to 1.8 wt.%) forming noticeable contents. Minor and trace elements with significant to moderate values (ppm) include Nb (965-4814), V (729-1846), Cr (495-756), Ta (44-180), and Zr (43-210). Nb/Ta ratios range between 10.0-44.9 and place the Nsanaragati rutile grains within the Niobium rutile. The measured contents for other elements including total REE are < 150 ppm, mostly falling below detection limits. Al2O3-MgO plots (wt.%) indicate that most rutile grains fall within a crust-derived rutile field, with rare plots in the mantle-derived field. Cr-Nb plots suggest the grains are related to rutile from metapelitic rocks, rather than metamafic rocks. Temperatures calculated from Zr in rutile thermometry range from 470 to 675°C, compatible with a likely crustal metapelitic source.
Arlin Bruno Tchamba, Rose Fouateu Yongué, U.C. Melo, Elie Kamseu, D. Njoya, D. Njopwouo
Silicates industriels
Des etudes ont ete effectuees sur le plateau bauxitique de Haleo-Danielle secteur Tchabal- Haleo dans Minim-Martap. Cette region etudiee est comprise entre 12°58,027' 12°58,827' longitude Est et 6°53,358' - 6°54,358' du latitude Nord de l'Equateur. Ce travail a fait l'objet des etudes d'affleurement, localisation et description precise des echantillons recueillis. Ces echantillons de bauxite ont fait l'objet d'analyse chimique des constituants majeurs (Al 2 O 3 , Fe 2 O 3 , SiO 2 , TiO 2 , CaO, Na 2 O, K 2 O et H 2 O). Combine a l'analyse qualitative (mineralogie rayons X, analyses thermiques gravimetrique et differentielle), nous avons effectue des calculs mineralogiques par la methode normative afin de dresser la composition mineralogique de chaque echantillon de bauxite. Parmi ces materiaux, on recense des echantillons a hautes teneurs en gibbsite (superieures a 85%), tres pauvres en fer et en alcalis respectivement (inferieures a 6% et 0,08%, la teneur en titane variant entre 1 et 5%. Ces types de bauxite non metallurgiques, a haute teneur en alumine, recenses dans trois sites, peuvent etre exploites dans la production de materiaux refractaires a haute teneur en alumine.
Nguo Sylvestre Kanouo, Arnaud Patrice Kouske, David R. Lentz, Rose Fouateu Yongué
Journal of Earth Science
Nguo Sylvestre Kanouo, David R. Lentz, Khin Zaw, Charles Makoundi, Emmanuel Afanga Archelaus Basua, Rose Fouateu Yongué and 1 more
Minerals
The pre- to post-Late Neoproterozoic geological histories in the south to southwestern part of Mamfe Basin (SW Cameroon) were reported following analysis of the zircon crystals from their host rocks. A genetic model was developed for the zircon host rocks’ formation conditions, and the registered post-emplacement events were presented. The obtained ages were correlated with the data available for rocks in the Cameroon Mobile Belt, SE Nigeria, and the Borborema Province of NE Brazil. Separated zircons from Araru black to whitish gneiss, Araru whitish-grey gneiss, and Mboifong migmatite were analyzed for their morphology and texture U-Th-Pb composition, and U-Pb ages. Published U-Pb zircon ages for Otu granitic pegmatite, Babi mica schist, and Nkogho I-type anatectic granite were updated. Zircon ages in Araru black to whitish gneiss; Araru whitish-grey, Mboifong migmatite, Babi mica schist, Nkogho I-type anatectic granite, and Otu granitic pegmatite date the Eburnean tectono-magmatic/metamorphic event in Cameroon and SE Nigeria. The Late Paleoproterozoic to Early Mesoproterozoic ages record extensional (continental rift) settings and anorogenic magmatism in the Borborema Province in the NE of Brazil. These ages date collisional phases between the São Francisco–Congo and West African cratons and the Saharan metacraton with metamorphism and magmatism in Cameroon. They also date the Kibarian tectono-magmatic/metamorphism and PanAfrican tectono-magmatic/metamorphism in SE Nigeria. The Late Paleoproterozoic to Early Mesoproterozoic ages date the Cariris Velhos orogeny in the Borborema Province in NE Brazil, with Early Tonian crustal rifting, magmatism, and metamorphism and the collisional phase of the Brasiliano orogeny with syn-collisional plutons and extensive shear zoning and post-collisional granite intrusions.
Christopher Fuanya, Anthony Temidayo Bolarinwa, Boniface Kankeu, Rose Fouateu Yongué, Ralain Bryan Ngatcha, Tangko Emmanuel Tangko
Journal of African Earth Sciences
Franck Wilfried Nguimatsia Dongmo, R. J. Chapman, Anthony Temidayo Bolarinwa, Rose Fouateu Yongué, David Banks, Jerry O. Olajide-Kayode
Journal of African Earth Sciences
Abiba Mefire Nkalih, Pascal Pilate, Rose Fouateu Yongué, André Njoya, Nathalie Fagel
Journal of Minerals and Materials Characterization and Engineering
Particle size analysis, Atterberg limits, X-ray diffraction, X-ray fluorescence and firing tests were used to determine physico-chemical, mineralogical and technological characteristics of residual lateritic (K1M, Ma2) and alluvial (KB3, KG3) clays from Foumban (West-Cameroon). For technological properties, the samples were pressed and fired over a temperature range of 900°C - 1200°C to determine the open porosity, linear shrinkage, bulk density and compressive strength. Kaolinite (31% - 65%) and quartz (35% - 50%) are dominant in Foumban clays with accessory K-feldspar, plagioclase, illite, smectite, rutile, and goethite. But their proportion changes from one sample to another, having a significant effect on the behaviour of the clay materials: highest proportion of quartz (50%) in sample K1M; relative high feldspars (20%) and illite contents (10%) in KB3 and MA2; high smectite content in KG3 (up to 20%). Chemical analyses indicate high SiO2 (49% - 77%) and low Al2O3 (14% - 23%) contents in the four samples, with comparatively low contents of iron oxides (4% - 7% in samples KB3 and KG3, 2.5% in MA2 and ~1.5% in sample K1M). The particle size distribution of the alluvial clays (KG3 and KB3) differs considerably: 7% to 37% of clay fraction, 20% to 78% of silt, and 15% to 58% of sand, while residual clays (K1M and MA2) present on average 12% of clay, 51% of silt and 37% of sand. Two raw clays (KB3 and MA2) can be used for bricks/tiles production without beneficiation or addition. K1M requires some flux addition to decrease the sintering temperature while KG3 presents poor properties due to the combined occurrence of smectite and a high clayey fraction (37%). Such mineralogical composition is responsible for very high plasticity (PI: 50), high shrinkage (LS: 5% - 16%), low porosity (OP: up to 21%) and high flexural strength (FS: 16 - 23 N/mm2) above 1050°C. This last clay is therefore less appropriate for bricks and roofing tiles production since degreasers must be added to the raw material.
Nguo Sylvestre Kanouo, Gabriel Ngueutchoua, Arnaud Patrice Kouske, Rose Fouateu Yongué, A. S. Venkatesh
Minerals
Trace element concentrations and U–Pb ages were obtained using Laser Ablation Split Stream Method from the core of 115 zircon grains from the western Meiganga gold placer deposit. The data was used to characterize zircon, to understand the history of crystallization and to locate source rocks within the local and regional geological settings. Zircon trace element geochemistry was used to distinguish between magmatic and metamorphic affinity. The magmatic zircons have characteristics compatible with their probable origin from granitoid, syenite, tonalite, charnockite and mafic to ultramafic rocks. The metamorphic zircons composition is compatible with growth from anatectic melts and by sub-solidus crystallization in equilibrium with garnet. The zircon ages reveal Archean, Paleoproterozoic, Mesoproterozic, and Neoproterozoic events with the principal source could mainly belong to Paleoproterozoic magmatic lineage. Some of the Paleoproterozoic magmatic zircons were probably sourced from two mica granite found within the local geology, whereas the remaining zircons have features indicating source rocks within the Congo Craton. We suggest that the geologic history of these zircons is related to crustal-scale magmatic and/or tectono-metamorphic events, possibly linked to Eburnean and Pan-African orogeny.
Amadou Pountouenchi, D. Njoya, André Njoya, D. Rabibisao, Jacques Richard Mache, Rose Fouateu Yongué and 4 more
ORBi UMONS
Nguo Sylvestre Kanouo, Rose Fouateu Yongué, Tanwi Richard Ghogomu, Emmanuel Njonfang, Syprien Bovari Yomeun, Emmanuel Archelaus Afanga Basua
Journal of Geology & Geophysics
Geologic prospecting, petrographic and geochemical analyses of mafic volcanic exposures in the west and southern part of the Mamfe Basin (SW Cameroon) distinguishes: basanites, picro-basalts, alkali basalts and tholeiitic basalts. They are relatively LREE-enriched, undersaturated, saturated or oversaturated due to presence or absence of normative nepheline, hypersthene or quartz. Basanites mainly form pillow-like lavas, and are aphyric or porphyritic. They have significant concentration of Ni (up to 387 ppm) and Ba (up to 436 ppm). These alkaline rocks cooled from less evolved mantle source magma. Picro-basaltic fragments exclusively found in the western part of the basin are Ni (up to 259 ppm) Ba (up to 2090 ppm) -enriched porphyritic, alkaline or subalkaline rocks. They also cooled from less evolved mantle source magma. Basalts form volcanoclasts, flow and dykes. They are aphyric or porphyritic, alkaline, transitional or subalkaline. Some of these rocks are Al-enriched. They crystallized from variably evolved mantle source magma within the Oceanic Island Basalt and Continental Rift Basalt tectonic settings.
Nguo Sylvestre Kanouo, Emile Ekomane, Rose Fouateu Yongué, Emmanuel Njonfang, Khin Zaw, Changqian Ma and 3 more
Journal of African Earth Sciences
Nguo Sylvestre Kanouo, Rose Fouateu Yongué, Emile Ekomane, Emmanuel Njonfang, Changqian Ma, David R. Lentz and 3 more
Resource Geology
Abstract The M amfe B asin is located in the SW of C ameroon and is an extension of the much bigger B enue T rough in the SE of N igeria. Along the A senem R iver and its tributaries in the western part of the M amfe B asin (close to the border with N igeria) gem placers yielding big zircon grains were found in recent river sediments close to N sanaragati. In order to determine the source area and to establish a possible correlation between the zircons found in the N sanaragati placers and rocks surrounding the M amfe B asin 56 detrital zircon grains were analysed regarding their U – P b ages and selected trace element contents by LA‐ICP – MS techniques. Possible source areas are rocks from the B enue T rough in the W est and from the C ameroon V olcanic L ine ( CVL ) in the SE of the study area. Based on microscopic analyses it was possible to distinguish two groups of zircons: reddish and non‐reddish ones, where the latter group comprises color variations from brown to orange, yellow to even colorless. In general, the detrital zircons show high hafnium values (4576 to 12565 ppm) and very variable thorium (7.8 to 1565 ppm) and uranium values (13.4 to 687 ppm). The T h/ U ratios vary from 0.4 to 2.3, allowing correlations for some zircon grains to kimberlitic, granitic or syenitic affinities. It was also possible to distinguish zircon grains crystallised in mafic mantle‐derived melts from those crystallised in felsic melts, e.g. from continental rift‐related magmatic systems. In general, the U – Pb zircon ages obtained range from 11.7 to 1949 Ma. All zircons of the reddish group yielded almost similar ages resulting in a C oncordia age of 12.4 Ma (Serravallian), an age unknown from the M amfe B asin so far. The group of non‐reddish zircons showed various ages ranging from Serravallian to Orosirian. It was possible to correlate the youngest ages with rocks known from intrusions along the CVL , dated with K / A r or A r/ A r methods. The most probable sources were M ount B amenda and M ount B ambouto in the east of the M amfe B asin. Cretaceous ages are interpreted as re‐recycled clastic sediments whose original source had been rocks in the south and the north of the B enue T rough and who had been eroded and deposited within the catchment area of the A senem river system in the M amfe B asin in post‐ C retaceous times. The oldest ages are assumed to represent the pan‐ A frican and pre‐pan‐ A frican basement of the M amfe basin.
Nguo Sylvestre Kanouo, Khin Zaw, Rose Fouateu Yongué, F L Sutherland, Sébastien Meffre, Emmanuel Njonfang and 2 more
Resource Geology
Abstract Zircons and other heavy minerals (corundum, rutile, ilmenite, magnetite, sillimanite) are identified in the Nsanaragati gem corundum placer deposit, in the western part of the Mamfe sedimentary basin, SW Cameroon. These alluvial minerals have different morphological characteristics and zircons, in particular, vary mostly in colour and shape. They are reddish, brownish, yellowish, pink or colourless. These minerals form rounded and sub‐rounded alluvial grains, prismatic, pyramidal or dipyramidal crystals. Reddish zircons retain their original crystallographic shape. Trace element and U–Pb isotopic geochemical analyses of these reddish zircons, using the LA‐ICP‐MS method give significant Hf (4576–6334 ppm), Th (46–1565 ppm) and U (66–687 ppm) contents, with Th/U ratio ranging from 0.6 to 3.0. The 206 Pb/ 238 U corrected mean age gave 12.39 ± 0.55 Ma, which characterizes an Upper Cenozoic (Serravallian) magmatic event. The zircons are probably sourced from a magmatic field in the South eastern boundary of the Cross River Formation. The Cameroon Volcanic Line of basaltic and alkaline lavas and intrusions which lie east of the Mamfe Basin mostly range in age from 37 Ma to <1 Ma. The zircons may also relate to the Mount Bambouto plateau lavas which lie northeast of the Mamfe sedimentary basin and have an eruptive age range of 21–14 Ma. The oldest Nsanaragati reddish zircon ages overlap within error with the end stages of the Bambouto eruptions. This eruptive or a related episode provides a potential source for megacrystic reddish zircons within the Nsanagarati placer deposit.
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