The Sangmelima granite-greenstone belts (South Cameroon): Integration of remote sensing and aeromagnetic data for structural interpretation

Akame, Joseph Martial; Pactrick, Assembe Stéphane; Philemon, Zo'o Zame; Sébatien, Owona; Théophile, Ndougsa Mbarga; Abuara, Azia Giles; Joseph, Mvondo Ondoa

doi:10.1016/j.ejrs.2018.11.005

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…However, the high-K granitoids from Ebolowa yielded Pb\ \Pb zircon evaporation minimum ages ranging from 2687 ± 3 Ma to 2666 ± 2 Ma, which has been interpreted as a late Neoarchean tectono-thermal event (Tchameni et al, 2000). Available structural data indicate that the Ntem Complex was affected by two Archean deformation phases (D1, D2) and late D3 Paleoproterozoic event ca 2.1-2.0 Ga (Akame et al, 2018(Akame et al, , 2020Feybesse et al, 1998;Owona et al, 2011;Tchameni et al, 2000). D1 is marked by a N080°E to N120°E and NNW-trend subvertical foliation formed during the high-grade metamorphic condition.…”

Section: Geological Settingmentioning

confidence: 99%

LA–ICP–MS zircon U Pb dating, Lu Hf, Sm Nd geochronology and tectonic setting of the Mesoarchean mafic and felsic magmatic rocks in the Sangmelima granite-greenstone terrane, Ntem Complex (South Cameroon)

Akame

Oliveira

Poujol

et al. 2020

Lithos

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The Ntem Complex represents the northwestern margin of Congo Craton in southern Cameroon. It consists mainly of charnockites, TTG suites, potassic grantitoids, minor supracrustal and mafic rocks. The latter include gabbronorite enclave or sill, gabbro and dolerite dykes. The metagabbro are basaltic to andesitic in composition and show geochemical features of low-La Archean tholeiitic basalts, and LREE-depleted (La N /Sm N < 1) akin to modern N-MORB. The doleritic dykes show high TiO 2 /P 2 O 5 (7.50-11.47) and (La/Yb) N ratios, and low Nb\ \Ta values similar to modern intraplate continental basalts and intermediate-La Archean tholeiitic basalt, least affected by contamination from granitic continental crust. The partial melting of low-to high-K mafic rocks of oceanic and continental arc affinity generated the charnockites and low−/medium-pressure TTGs. The potassic granites were formed by partial melting of charnockite or TTG, and inherited many geochemical features of their sources. New LA-ICP-MS U\ \Pb zircon dates suggest that the charnockites and TTG suites formed at 3155-2850 Ma. The gabbro intrusion was dated at 2866 ± 6 Ma. Migmatisation of TTG-gneiss was coeval whit the regional high-grade metamorphism event at 2843 ± 7 Ma. The potassic granites were probably crystallized at~2758 Ma. The garnet-whole rock Sm\ \Nd age of 2744 ± 31 Ma may represent the age of the second anatexis event coeval with D2 deformation. Literature data indicate the disruption or open isotopic systems in the Ntem Complex around 2500-2600 Ma.

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Section: Geological Settingmentioning

confidence: 99%

LA–ICP–MS zircon U Pb dating, Lu Hf, Sm Nd geochronology and tectonic setting of the Mesoarchean mafic and felsic magmatic rocks in the Sangmelima granite-greenstone terrane, Ntem Complex (South Cameroon)

Akame

Oliveira

Poujol

et al. 2020

Lithos

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“…From the NE to ENE striking shear patterns with sinistral sense (horizontal component) well developed than NW-SE dextral strike slip; antagonist kinematic criteria, horizontal movement being dextral or sinistral along the NNE-SSW brittle strike slip define the reactivation of earliest C 2 shear zones. Geometrical and kinematic criteria indicate that the C 3 shear pattern is compatible whit north-south shortening in the sinistral Riedel fault system (Akame et al, 2018).…”

Section: Significance Structural Imprints Recorded In Crystalline Rocksmentioning

confidence: 92%

“…NE to ENE-trending and WNW to NW-trending fractures are ubiquitous throughout the study area (Fig. 11; Akame et al, 2018Akame et al, , 2014.…”

Section: D3 Structuresmentioning

confidence: 93%

“…1d) occasioned the reactivation of the Archean structures and the development at regional scale N05-to N045°-trend sinistral shear zones C 3 (Fig. 12; Maurizot et al, 1986;Feybesse et al, 1998;Tchameni et al, 2000;Shang et al, 2004a;Owona et al, 2011;Akame et al, 2018). A magmatism event associated Fig.…”

Section: Updated Tectonic Evolution Model For the Nw Congo Craton Marginmentioning

confidence: 95%

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Archean tectonics in the sangmelima granite-greenstone terrains, Ntem Complex (NW Congo craton), southern Cameroon.

Akame

Owona

Hublet

et al. 2020

Journal of African Earth Sciences

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Sangmelima granite-greenstone terrains (SGB) provide a new overview of the evolution of the Ntem Complex (South Cameroon), the northwestern part of the Congo Craton. The regional deformation is marked by a strong steep dips foliation and steeply plunging mineral-stretching. D 1 -related structures are folding and shearing by a D 2 deformation that is synchronous with extraction granitic dykes. D 1 -D 2 structures were developed during regional E-W sub-horizontal shortening under ductile conditions associated with steeply dipping principal stretching in a transpressive regime, progressive strain localization along strike-slip shear zones. Syn-D 1 mineral assemblages and high strain microstructures suggest that ductile deformation D 1 occurred under high-grade metamorphic conditions, whereas D 2 microstructures suggest a brittle deformation. The strain patterns in the SGB recorded a long-lasting Archean tectonic history within the Archean Ntem Complex (ca. 2.83-2.72Ga). Finally, some Archean structures were reactivated during a brittle deformation (D 3 ), likely during the Eburnean event.The Archean block in the north-western margin of the Congo Craton (Fig. 1a), corresponds to the Ntem-Chaillu Block (here after called

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“…In a coastal zone, high amounts of salt in groundwater have negative repercussions for residents, agricultural, and industrial activity (Hounsinou, 2020). To better understand the geological features of southern Cameroon, numerous geophysical and geological research have been conducted (Aretouyap et al, 2020;Joseph Martial et al, 2019;Nguiya et al, 2019). These studies have permitted the detection of aquifers and the discovery of geoelectric sections (José et al, 2021;Tepoule, Kenfack et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Groundwater Zones and Salinity Assessment in Aquifers of the Campo District, South Cameroon Using the GIS, AHP and PCA Approach.

Raoul

Francoise

Hermann

et al. 2022

Preprint

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In the Campo region, groundwater is critical for human consumption and social activity. Groundwater potential is influenced by a region's geological, geophysical, and hydrogeological factors. The major goals of this research are to determine which regions are ideal for productive groundwater drilling and to assess the source of salinity in the study area's coastal aquifers. The groundwater potential map was created using Geographic Information Systems (GIS) and the Hierarchical Analysis Process (AHP). The process of groundwater mineralization was studied using principal component analysis (PCA). Six variables were taken into account, and weights were assigned to them based on their impact on groundwater recharge. In a GIS environment, spatial integration and a combination of theme layers were conducted. Campo's groundwater potential map was divided into four zones: low 14.4% (389.6 km²), moderate 53.3% (1484.5 km²), high 28.3% (783.3 km²), and extremely high 4.1% (110.9 km²). The results of the PCA reveal a mechanism of water-rock interaction, as a result of geological alteration and a salinization process caused by the intrusion of seawater and human activity The source of salinity in groundwater is manmade (agricultural and residential activities) rather than seawater intrusion. Seawater infiltration is not greatly aided by the low lineament density found near the beaches.

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The Sangmelima granite-greenstone belts (South Cameroon): Integration of remote sensing and aeromagnetic data for structural interpretation

Cited by 10 publications

References 25 publications

LA–ICP–MS zircon U Pb dating, Lu Hf, Sm Nd geochronology and tectonic setting of the Mesoarchean mafic and felsic magmatic rocks in the Sangmelima granite-greenstone terrane, Ntem Complex (South Cameroon)

LA–ICP–MS zircon U Pb dating, Lu Hf, Sm Nd geochronology and tectonic setting of the Mesoarchean mafic and felsic magmatic rocks in the Sangmelima granite-greenstone terrane, Ntem Complex (South Cameroon)

Archean tectonics in the sangmelima granite-greenstone terrains, Ntem Complex (NW Congo craton), southern Cameroon.

Characterization of Groundwater Zones and Salinity Assessment in Aquifers of the Campo District, South Cameroon Using the GIS, AHP and PCA Approach.

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