Petrogenesis of peraluminous magmas from the Akum-Bamenda Massif, Pan-African Fold Belt, Cameroon

Nzenti, Jean Paul; Abaga, Barbara; Suh, Cheo Emmanuel; Nzolang, Charles

doi:10.1080/00206810903442402

Cited by 31 publications

(15 citation statements)

References 53 publications

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“…In the millications R1 versus R2 discrimination diagram ( Figure 13) of [39] used to distinguish the tectonic setting, Bamenda granites plot in the syn-collision field whereas Bamenda leucogranites plot in the post-tectonic field. From the two geotectonic settings proposed by [40] to constrain the generation of high-K and cal-alkaline magma, the syn-to post-collisional settings could be reasonably ascribed to Bamenda granitoids which is consistent regarding their comparison with other works carried out in the eastern part of the central domain of the Pan African Fold Belt in Cameroon [4,5,12,14]. According to [41], the crustal source rocks of high-K magmas in this context may occur as a consequence of decompression following the lithospheric root delamination.…”

Section: Tectonic Setting and Pan-african Fold Belt Evolution In Camesupporting

confidence: 82%

“…The central domain of the PANEFB consists of an assembly of fragments of Paleoproterozoic continental crust recrystallised under high-grade granulite facies (850-900°C, 10-12Kb) at ca 2100Ma [11] intruded by widespread Neoproterozoic plutonic rocks of high-K, calc-alkaline affinities [12,13,14,15,16]. [5] in Akum area located south of the study area have distinguished a rock sequence consisting of peraluminous S-type leucogranites and orthogneissified I-type biotite granite ( Figure 1b); all displaying characteristics of medium to high-K calc-alkaline series.…”

Section: Geological Settingmentioning

confidence: 99%

“…Mount Bamenda to which belongs the study area is the fourth largest massif in volume in the continental sector of the plutonic-volcanic Cameroon line [2]. It consists of volcanic rocks (alkali basalt, trachyte, rhyolite, and ignimbrite) with age ranging from 22 Ma to present [3] and granito-gneissic basement of Pan-African ages [4,5]. Bamenda area is almost covered by volcanic products which have been studied in detail (eg., [2,3,6]) while the basement rocks remain poorly surveyed, probably because of the scarcity of outcrops.…”

Section: Introductionmentioning

confidence: 99%

“…However, in a few places the granitic basement outcrops as windows in the volcanic cover enabling their observation and study. The available data on the Bamenda basement is restricted to the petrogenesis of peraluminous magma from Akum massifs, located about 12 miles to the south of Bamenda town [5]. Therefore, this piece of scientific research is a contribution to the geology of Bamenda basement, as it provides the first petrochemical characterization of two Contrasting Ba-Sr granitoids from Bamenda town.…”

Section: Introductionmentioning

confidence: 99%

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Contrasting Ba-Sr Granitoids from Bamenda Area, NW Cameroon: Sources Characteristics and Implications for the Evolution of the Pan African Fold Belt

Nono¹,

Wotchoko²,

Magha³

et al. 2018

JGG

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The basement rocks of Bamenda town are mainly covered by volcanic rocks and are made up of two distinct types of granitoids: granites and leucogranites. These basement rocks belong geochemically to the same granite field. The studied granitoids are silica rich, with concentrations ranging from 70 to 73% in granite and 73 to 76% in leucogranite. Both belong to high-K calc-alcaline series with granite being magnesian and more potassic (Na 2 O/K 2 O < 1) whereas the leucogranite is ferriferous and similar to Na-granitoids (Na 2 O/K 2 O >1). Leucogranites are low Ba-Sr granitoids, strongly peraluminous (A/CNK > 1.1) and plot in the field of S-type granites, while granites are high Ba-Sr granitoids, slightly peraluminous and plot in the field of I-type granitoids. The chondritenormalized REE patterns show more LREE enrichment in granites (>100*chondrite) than in leucogranites (>10*chondrite). Major and trace element compositions of the leucogranites and granites indicate crustal derivation from the partial melting of metapelite and metagreywacke respectively. The REE patterns display pronounced negative Eu anomalies (Eu/Eu* = 0.23-0.36) in leucogranites due to low degree of partial melting of a plagioclase depleted crustal source, and weakly negative to null Eu anomalies (Eu/Eu* = 0.81-1.08) in granites due to high degree of partial melting. The estimated temperatures of Bamenda granitoids magma range between 800°C and 950°C. Bamenda I-type granites are syn-tectonic and are similar to the other granitoids of the central domain of the Pan-African North-Equatorial Fold belt in Cameroon. Bamenda S-type peraluminous leucogranites are post-tectonic and chemically similar to the Himalayan peraluminous leucogranites. Furthermore, decompression model may be related to Bamenda leucogranite formation. Tectonically, the studied granitoids are related to crustal delamination characterizing the post-collisional event within the Pan African Fold Belt.

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Section: Tectonic Setting and Pan-african Fold Belt Evolution In Camesupporting

confidence: 82%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Contrasting Ba-Sr Granitoids from Bamenda Area, NW Cameroon: Sources Characteristics and Implications for the Evolution of the Pan African Fold Belt

Nono¹,

Wotchoko²,

Magha³

et al. 2018

JGG

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“…The scholar indicated that Bamenda belongs to the West Cameroon Highlands, the most important geomorphologic system in the region. The study area constitutes part of the Bamenda Mountains which is made up of a basement rock comprised mainly of leucogranite of Precambrian age, with the basement rock overlain by volcanic materials composed of mafic and felsic lavas [11]. The mafic lavas comprise of basalts which outcrop as lava flows and pyroclastic deposits, while the felsic lavas include trachytes, phonolites, and rhyolites [12].…”

Section: Geology and Hydrogeology Of The Study Areamentioning

confidence: 99%

Assessment of groundwater quality in Bamenda–Cameroon for suitable applications

et al. 2019

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Groundwater quality of the Bamenda metropolis (Northwest Region-Cameroon) was assessed for its suitability for possible uses. A total of 22 groundwater samples were collected from dug wells and boreholes within the Bamenda town during the wet and dry seasons. Hydrodynamics and physicochemical parameters were measured. Other parameters including, major ions, sodium percentage (Na %), sodium adsorption ratio (SAR), and water quality index (WQI) were deduced from chemical analysis, and their distributions were demonstrated using spatial distribution contour maps. Durov's plot, Gibbs diagram, and chloro-alkaline indices were used to deduce the source and detect the groundwater samples for different applications. The findings indicate that groundwater flows in the study area from shallow to deep aquifers. Piper's plot shows Ca-Mg-CO 3-HCO 3 and Ca-Mg-Cl-SO 4 as the main water types. WQI and World Health Organization (WHO) guidelines show that all the groundwater samples have excellent water quality for drinking purpose. Electrical conductivity (EC), Na %, and SAR values indicate that all wet season water samples are of low-salinity class, whereas dry season samples are of low to medium salinity; hence, all the samples are suitable for irrigation. Though there is extensive use of agricultural fertilizers and intense urbanization in the metropolis, anthropogenic activities, for now, seem to have minimal impact on the quality of groundwater.

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Zircon trace element geochemistry and Ti‐in‐zircon thermometry of the Linté Pan‐African granitoids, Central Cameroon: Constraints on the genesis of host magma and tectonic implications

et al. 2021

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The Linté area belongs to the central part of the Adamawa‐Yadé Domain (AYD) within the Pan‐African Central African Fold Belt (CAFB) in Cameroon. This area is dominated by Neoproterozoic high‐K calc‐alkaline syenite and monzonite intruding Archean to Palaeoproterozoic gneisses. In this contribution, trace element compositions of zircon obtained using laser ablation inductively coupled plasma mass spectrometry are used to constrain the petrogenesis and tectonic setting of Linté area. The analysed zircon grains display restricted ranges of Hf contents with an average of 8,197 ppm in syenite, 8,220 ppm in alkali‐feldspar syenite, and 9,026 ppm in monzonite. They display high Th/U ratios (>0.5) typical of magmatic zircons. The monzonite zircons have a higher ∑REE content (483.42 ppm) than the syenite zircons (237.70 ppm). The chondrite‐normalized rare‐earth element (REE) diagram of Linté samples shows very similar patterns, characterized by a steeply rising slope due to important heavy rare‐earth element enrichment relative to light rare‐earth element, with distinctive positive Ce and negative Eu anomalies. The application of the Ti‐in‐zircon thermometer reveals a wide range of crystallization temperatures (574–1,137°C for syenites and 713–1,008°C for monzonite), implying a deep level of melting, likely within the lower continental crust of the CAFB. The integration of geochemical behaviours of some trace elements (U, Hf, Zr, Ce, Th, and Nb), together with discrimination diagrams, suggests the crystallization of a continental crust‐derived magma under variable oxidation states and emplacement in a magmatic‐arc setting. This finding represents and adds on to the N‐S geodynamic convergence model between the AYD and the northern border of the Congo Craton.

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Petrogenesis of peraluminous magmas from the Akum-Bamenda Massif, Pan-African Fold Belt, Cameroon

Cited by 31 publications

References 53 publications

Contrasting Ba-Sr Granitoids from Bamenda Area, NW Cameroon: Sources Characteristics and Implications for the Evolution of the Pan African Fold Belt

Contrasting Ba-Sr Granitoids from Bamenda Area, NW Cameroon: Sources Characteristics and Implications for the Evolution of the Pan African Fold Belt

Assessment of groundwater quality in Bamenda–Cameroon for suitable applications

Zircon trace element geochemistry and Ti‐in‐zircon thermometry of the Linté Pan‐African granitoids, Central Cameroon: Constraints on the genesis of host magma and tectonic implications

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