Mobilization and redistribution of major and trace elements in two weathering profiles developed on serpentinites in the Lomié ultramafic complex, South-East Cameroon

Ndjigui, Paul‐Désiré; Paul, Bernard; Bitom, Dieudonné; Dia, Anta Tal

doi:10.1016/j.jafrearsci.2007.10.006

Cited by 73 publications

(55 citation statements)

References 40 publications

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“…A tremendous amount of literature exits on the mechanism of chemical weathering under different geomorphic and paleoclimatic conditions, provided by many investigators (Stanley, 1968;Lelong, 1969;Pedro, 1964Pedro, , 1968Millot, 1971;Krinsley & Cavallero, 1970;Berner & Holdren, 1979;Nahon et al, 1979Nahon et al, , 1982Tardy, 1993;Kitagawa et al, 1994;Wilson, 1995;Wouatong et al, 1996;Wouatong et al, 2005;Deepthy & Balakrishnan, 2005;Nguetnkam et al, 2008;Ndjigui et al, 2008;Kamgang et al, 2009). The main chemical factors that usually control the weathering of rocks include: solution pH, parent material composition and crystallinity, microenvironment, oxidation-reduction potentials, temperature and ionic strength.…”

Section: Introductionmentioning

confidence: 99%

The Origin of Etch Pits Recorded on Residual Grain Surfaces from Kaolinized Granitic Rocks West Region Cameroon

Wouatong¹,

Yerima²,

Fouateu³

et al. 2013

ESR

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The weathering of some granitic rocks in the West Region of Cameroon (Central Africa) was examined by X-ray diffraction (XRD) and X-ray fluorescence Spectrometer (XRF) in conjunction with Scanning Electron Microscopy (SEM). Kaolinite and illite were the most predominant weathering products whereas gibbsite, goethite and maghemite were also found in small amounts; only residual quantities of quartz and potassium feldspar were observed. The geochemical study shows the mobility of major elements during the progressive kaolinization of granitic rocks. The main trend is the loss of elements, with high losses of CaO, Na 2 O and MgO, slight losses of SiO 2 while Al 2 O 3 and K 2 O appear to increase with weathering intensity. Chemical index of alteration (CIA) shows a high value (68-95%). The scanning electron microscope analysis reveals the existence of several surface features that reflect the effect of mainly chemical actions on the quartz and K-feldspar grains. Quartz and K-feldspar crystals from kaolinized granitic rocks show low to very high chemical etching attributed to weathering under moderate to severe environmental conditions such as low pH, high temperature and humidity and extreme leaching typical of tropical climatic conditions. Etched pit densities on quartz surfaces increase with weathering, as a result of increasing silica concentrations in pore fluids.

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Section: Introductionmentioning

confidence: 99%

The Origin of Etch Pits Recorded on Residual Grain Surfaces from Kaolinized Granitic Rocks West Region Cameroon

Wouatong¹,

Yerima²,

Fouateu³

et al. 2013

ESR

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“…The mass balance assessment approach, according to Ndjigui et al [2], enables us to understand the mobility of elements in weathered materials. This was done by the estimating of losses and gains of matter expressed either in percent or kg/m 3 of the weathered parent material and are shown in Table 2.…”

Section: Relative Element Mobilitymentioning

confidence: 99%

“…However, concentrations of Ga, Hf, Nb, Ta, Y, Zr, Pb, Sc and Zn increase from the bedrock to coarse saprolite. This might have been caused by their passive accumulation, as other rock constituents that were transported into percolating groundwater were probably enhanced by the high oxygen fugacity of the soil in the lowly saturated zone nearest to the atmosphere [2]. The slight increase of Cr, Cs, Sr, Th, U, V, Zr, Cu and even Pb concentrations in the upper humiferous surface horizon might be due to intense biological activity and recycling process by certain plants [34,35].…”

Section: Behaviour Of Trace Elementsmentioning

confidence: 99%

“…Many works have been done on the behaviour of chemical elements in the weathering materials developed under various parent rocks [1][2][3][4]. In the Central African region, the studies are concentrated mainly in the humid tropical zone, characterised by the formation of large thick weathering mantles.…”

Section: Introductionmentioning

confidence: 99%

“…It also depends on the minerals present and the prevailing mechanisms of weathering. Several authors [2,6] have noticed the presence of cerium anomalies in the saprolite zone. Bayiga et al [7] reported a relative accumulation of Si, Al, Fe and K, an accumulation of Ru, Ba, Zr, Hf, V, Sn and Pb, and a depletion of Sr, Zn, Co, Y and most rare-earth elements (REE) in soil profile developed on amphibolites.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical Features of the Weathered Materials Developed on Gabbro in a Semi-Arid Zone, Northern Cameroon

Tsozué

Ndjigui

2017

Geosciences

Self Cite

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Investigation on the mobilization and the redistribution of major, trace and rare-earth elements (REE) was performed along a soil profile developed on gabbro in the semi-arid zone (Northern Cameroon), using mineralogical and geochemical analyses. The gabbro has high contents in Ba, Cr, V, Sr, Ni, Zn, Zr, Cu, Co and Sc. The total REE content is 49 mg/kg with strong light rare-earth elements (LREE) abundance. The Ce/Ce* and Eu/Eu* ratios are very close to 1 (0.98 and 1.02 respectively) and the (La/Yb) N ratio is very low (1.48). The weathering of the bedrock leads to the differentiation of coarse saprolite, fine saprolite, loamy clayey horizon and humiferous horizon.

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Geochemical assessment, distribution, and dynamics of trace elements in urban agricultural soils under long‐term wastewater irrigation in Kano, northern Nigeria

Abdu

Agbenin

Buerkert

2011

Z. Pflanzenernähr. Bodenk.

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A study was conducted to evaluate the distribution and origin of trace elements (Ti, Fe, Nb, Pb, Rb, Sr, Y, and Zr) in five representative long‐term wastewater‐irrigated urban vegetable gardens of Kano, Nigeria. Surface‐soil concentrations (0–15 cm) of Ti (4600–14 300 mg kg–1), Fe (4000–31 800 mg kg–1), Pb (96–355 mg kg–1), and Y (33–98 mg kg–1) were high compared to mean concentrations in comparable soils elsewhere. However, soil‐pollution assessment yielded no evidence of anthropogenic input of the trace elements studied. Indices such as the enrichment factor, the contamination factor, and the geoaccumulation index (Igeo) revealed little to no contamination with trace elements. The Igeo calculated for these metals varied across locations between 0.00 and 0.12 with Nb having the highest Igeo value. Similarly, the contamination factor was low for all metals with the exception of Fe reaching a contamination factor of 4.2 at one location. Geochemical‐balance evaluations showed depletion of all trace elements except for Fe which was 176% higher than in a natural uncultivated and unirrigated reference soil. Correlation and factor analyses showed that all determined trace elements likely originated from the same natural sources, which probably are the soil parent material and atmospheric depositions.

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Mobilization and redistribution of major and trace elements in two weathering profiles developed on serpentinites in the Lomié ultramafic complex, South-East Cameroon

Cited by 73 publications

References 40 publications

The Origin of Etch Pits Recorded on Residual Grain Surfaces from Kaolinized Granitic Rocks West Region Cameroon

The Origin of Etch Pits Recorded on Residual Grain Surfaces from Kaolinized Granitic Rocks West Region Cameroon

Geochemical Features of the Weathered Materials Developed on Gabbro in a Semi-Arid Zone, Northern Cameroon

Geochemical assessment, distribution, and dynamics of trace elements in urban agricultural soils under long‐term wastewater irrigation in Kano, northern Nigeria

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