Provenance and depositional history of Mesozoic sediments from the Mamfe basin and Douala sub-basin (SW Cameroon) unraveled by geochemical analysis

Ngueutchoua, Gabriel; Eyong, John Takem; Bessa, Armel Zacharie Ekoa; Agheenwi, Zita Bih Azanji; Maschouer, Alain Emane; Kemteu, Christel Sobdjou; Dzoti, Yannick Lontchi; Hamadou, Touda; Baboule, Bibiche-Mabel Ongbassouek; Nguemo, Gatien Romuald Kenfack

doi:10.1016/j.jafrearsci.2019.103550

Cited by 25 publications

(14 citation statements)

References 84 publications

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“…However, the K 2 O/Al 2 O 3 ratio shows values < 1 in all samples from the Yoyo, Mouanko, and Mbiako suggesting that the textural maturity is low. These findings are consistent with those of Ngueutchoua et al ( 2019a , b ) in the Mamfe basin and Douala sub-basin sediments. They do not agree with Abu and Sunkari ( 2020 ), who found that beach sediments along Ghana’s Western coast have high textural maturities.…”

Section: Discussionsupporting

confidence: 93%

“…14 ). Hayashi et al ( 1997 ) created a binary diagram of Zr vs TiO 2 that is often utilized in sedimentary provenance research (e.g., Armstrong-Altrin et al 2012 ; Ngueutchoua et al 2019a , b ; Ekoa Bessa et al 2021 ; Kontchipe et al 2021 ; Chougong et al 2021 ). This diagram aids in the identification of mafic rocks (TiO 2 /Zr ˃ 200), intermediate rocks (TiO 2 /Zr ranging between 200 and 55), and felsic igneous rocks (TiO 2 /Zr ˂ 55).…”

Section: Discussionmentioning

confidence: 99%

“…Generally, the petrography and geochemistry of siliciclastic and also detrital sediments have been used to reconstruct the tectonic setting of depositional basins, fluvial environments, and lakes (e.g., Armstrong-Altrin 2015 ; Ekoa Bessa et al 2018 ; Hernández-Hinojosa et al 2018 ; Ngueutchoua et al 2019a , b ; Haque and Roy 2020 ; Kwewouo Janpou et al 2022 ) and to interpret the source rock characteristics (Khan and Khan 2015 ; Ngueutchoua et al 2019a , b ; Ramamoorthy and Nazir 2020 ; Abu and Sunkari 2020 ) as well as to infer the paleoweathering of the source areas (Ma et al 2017 ; Ngueutchoua et al 2019a , b ; Ekoa Bessa et al 2021 ). The geochemical composition of sediments depends on various factors, which include source rock nature, weathering intensity, and sediment maturity (McLennan et al 1993 ).…”

Section: Introductionmentioning

confidence: 99%

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Petrography and geochemistry of beach sediments along the central coast of Cameroon: constraints on paleoweathering, provenance, and tectonic setting

et al. 2022

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The paleoweathering, provenance, and tectonic setting of the source region were determined with compositional and geochemical analyses of sediments obtained from the beach locations of Yoyo, Mouanko, and Mbiako along the central coast of Cameroon. The beach sediments are medium to coarse-grained and are brown to light brown. Their mineralogy is dominated by quartz and clay minerals with a medium amount of feldspars, rutile, goethite, hematite, and calcite. Moreover, their petrography is made up of quartz and feldspars, with low proportions of augite, apatite, biotite, and zircon. The sediments are classified as sublitharenite, and they are mostly made up of felsic rocks derived from the adjacent Neoproterozoic magmatic and gneissic basement rocks. Weathering indices such as the chemical index of alteration (CIA) and plagioclase index of alteration (PIA) indicated that in this study, the source area’s weathering intensity was moderate. The index of chemical variability (ICV) indicates a low maturity. The geochemistry data revealed passive and rift settings for the beach areas, which are congruent with the local geology.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrography and geochemistry of beach sediments along the central coast of Cameroon: constraints on paleoweathering, provenance, and tectonic setting

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“…Geologically, the Mgoua watershed is located in the large Douala sedimentary basin lying on a Precambrian basement composed of magmatic (ancient syntectonic intrusive granites) and metamorphic (crystalline schists, biotite, and amphibole gneiss) formations. These basement formations are found on the Northern part of the remobilized and restructured Eburnian Congo Craton (Ngueutchoua et al 2019 ). Overlying this basement, are sedimentary series that present a low-slope relief characterized by formations of secondary, tertiary, and quaternary ages and representing a multi-layered aquifer system with a sandy, silty, and/or sandy-clay fractions (Ngueutchoua et al 2019 ).…”

Section: Study Areamentioning

confidence: 99%

Rare earth elements in surface waters and sediments of the Mgoua watershed, south western Cameroon

et al. 2022

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The concentrations and distribution spectra of 14 stable rare earth elements (REE) were studied for surface waters ( n = 30) and sediments ( n = 30) of the tropical zone Mgoua watershed in southwest of Cameroon. Samples were analyzed using the inductively coupled plasma mass spectrometer (ICP-MS) method. The ∑REE concentrations of the surface waters vary from 0.11 to 6.60 µg/L with an average value of 1.18 µg/L. This average is 150 times lower than the average values of the Post-Archean Australian Average Shale (PAAS). In the sediments, the concentrations range from 282.12 to 727.67 ppm with an average value of 550.05 ppm, making it 2.5 times higher than the PAAS. Rare earth spectra normalized to PAAS are spread out and show heavy rare earth enrichment; positive Eu anomalies; negative, low, or no Ce anomalies; and a gradual decrease in heavy earths in river and well waters and sediments, but are sawtooth with strong negative Ce anomalies in effluent waters and sediments. A low rare earth fractionation is noted in river and well waters [(La/Yb) N ~ 0.35–1.19], while it is high in effluent waters [(La/Yb) N ~ 0.42–56.99]; a slight depletion of rare earths in all environments [(La/Sm) N ~ 0.69–2.35], as well as a depletion of heavy rare earths [(Gd/Yb) N ~ 0.58–1.94]. In the sediments, the same characteristics are found with elemental ratio values differing slightly [(La/Yb) N ~ 1.15–1.99]; [(La/Sm)N ~ 0.75–1.36]; and [(Gd/Yb) N ~ 1.15–2.01]. This study shows that the Mgoua watershed does not have a high concentration of REE, although in the sediments they are well above the average PASS value while they are insignificant in the waters.

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“…The Mamfe Basin was essentially filled with continental clastic sediments (conglomerates, sandstones, arkoses, marlstones, siltstones, mudstones, and shales) with local limestones and evaporitic deposits [36,37,[106][107][108][109][110][111][112][113][114][115]. Part of these rocks (mainly shales) enclose organic matter with some petroleum potential [114,116].…”

Section: Local Geological Settingmentioning

confidence: 99%

New Insights into Pre-to-Post Ediacaran Zircon Fingerprinting of the Mamfe PanAfrican Basement, SW Cameroon: A Possible Link with Rocks in SE Nigeria and the Borborema Province of NE Brazil

et al. 2021

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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.

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Provenance and depositional history of Mesozoic sediments from the Mamfe basin and Douala sub-basin (SW Cameroon) unraveled by geochemical analysis

Cited by 25 publications

References 84 publications

Petrography and geochemistry of beach sediments along the central coast of Cameroon: constraints on paleoweathering, provenance, and tectonic setting

Petrography and geochemistry of beach sediments along the central coast of Cameroon: constraints on paleoweathering, provenance, and tectonic setting

Rare earth elements in surface waters and sediments of the Mgoua watershed, south western Cameroon

New Insights into Pre-to-Post Ediacaran Zircon Fingerprinting of the Mamfe PanAfrican Basement, SW Cameroon: A Possible Link with Rocks in SE Nigeria and the Borborema Province of NE Brazil

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