The formation of rare earth element scavenger minerals in weathering products derived from alkaline rocks of SE-Bahia, Brazil

Marker, A.; Oliveira, Joaquim Julio de

doi:10.1016/0009-2541(90)90271-8

Cited by 19 publications

(5 citation statements)

References 2 publications

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“…Very few studies have documented the behaviour of REE, Th and U in tropical weathering profiles (Muller and Calas, 1989;Marker and de Oliveira, 1990;Boulangé and Colin, 1994;Braun et al, 1998). In South Cameroon particularly, the study of these elements in soils remain limited to investigations of lateritic profiles on syenite in the rainforest environment Braun et al, 1993) and of soil sequence hosted in gneiss at the forest-savanna boundary zone (Braun et al, 1998).…”

Section: Introductionmentioning

confidence: 98%

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

Bitom

et al. 2008

Journal of African Earth Sciences

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Section: Introductionmentioning

confidence: 98%

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

Bitom

et al. 2008

Journal of African Earth Sciences

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“…The Xichang area has a tropical plateau monsoon climate. Similar to soil in Massachusetts and soil under humid and semi‐humid climate conditions, the soil in this area exhibited the phenomenon of REE depletion in the upper part and REE enrichment in the lower part (Marker & De Oliveira, 1990; Wang, 1987; Wang, Yu, & Zhao, 1989). Therefore, the enrichment of REEs in the parent material layer of the profile is considered to be related to leaching and deposition during the process of element migration (Zhao, Bi, & Liu, 2005).…”

Section: Discussionmentioning

confidence: 86%

“…The REE distribution patterns of P2 and P3 were similar (Figure 8b). In terms of layers, REE content followed the order parent material layer (C layer) > deposition layer (B layer) > humus layer (Marker & De Oliveira, 1990;Wang, 1987;Wang, Yu, & Zhao, 1989). Therefore, the enrichment of REEs in the parent material layer of the profile is considered to be related to leaching and deposition during the process of element migration (Zhao, Bi, & Liu, 2005).…”

Section: Ree Differentiation Characteristicsmentioning

confidence: 99%

Chemical weathering intensity and geochemical characteristics of Cretaceous terrigenous clastic rock‐purple soil profiles in the Pushi area, Xichang

Liu

et al. 2022

Geological Journal

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The Pushi area of South‐west China features a large area of purple soil that formed by the weathering of Cretaceous terrigenous clastic rocks. In this study, four vertical profiles of the purple soil (P1, P2, P3, and P4) derived from different pedogenic parent rocks were investigated. Specifically, the chemical weathering intensity and element migration, enrichment, and differentiation characteristics were analysed and the influencing factors of chemical weathering were explored. According to the discrimination map of major and trace elements and content characteristics of rare earth elements, the soil profiles are controlled by complex chemical weathering processes. Various geochemical parameters and indicators exhibited good correlation, and the chemical weathering intensity of the profiles followed the order P1 (mudstone) > P3 (silty mudstone) > P4 (argillaceous siltstone) > P2 (sandstone). The overall chemical weathering intensity of argillaceous rocks was slightly higher than that of sandstone, and the four profiles generally reflected medium to strong chemical weathering. The migration, enrichment, and differentiation characteristics of geochemical elements were found to be mainly affected by different chemical weathering intensities and stages, followed by leaching deposition. The chemical weathering characteristics varied for the four profiles with different pedogenic parent rocks, which could be mainly attributed to internal factors such as the lithology of the pedogenic parent rock and external topographic factors such as altitude.

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“…During the formation of soil, the mobility and structural reorganization of REE involve automatically their fractionation [38][39][40][41] and consequently the features of the parent rock remain along the Bangam KY1 profile favoured by the circulation of meteorite waters or the pH/Eh of environment. The Chondrite and basalt -normalized REE indicates a light rare earth enrichment (LREE) relative to heavy rare earths (HREE) due to higher stability of the ligands (sulphates and carbonates) and higher redistribution along the profiles during lateritic alteration [68][69][70][71][72][73][74] and [39], the mobilization of the REE during weathering processes results from different factors related to the parent rock mineralogy, specifically the distribution of the REE in the primary bearing minerals, the stability of these minerals during weathering, and their abundance in the parent material. In addition, the low values of (La/Yb) N (0.79-8.83), may be attributed to intense REE fractionation [75].…”

Section: Based On the Molar Ratio Sio 2 /Al 2 O 3 Ormentioning

confidence: 99%

Geochemical and Petrographical Evolution of the Weathering Mantle Derived from Basalt in Bangam Locality (West-Cameroon): Implication in the Bauxitisation Process

Sojien

Mamdem

Wouatong

et al. 2019

CJAST

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A petrographical and geochemistry study of weathering mantle derived from the basaltic parent rock (plagioclase, olivine, pyroxene, zircon) has been conducted in the locality of Bangam (West-Cameroon). The weathered profile shows a vertical lithology succession of weathered parent rock, isalteritic clayed domain and superficial duricrust (alloterite). The weathering of basalt started by the formation of “pain d’epices” structure rich in gibbsite, metahalloysite, kaolinite. The geochemistry analysis of major elements indicate that SiO2 (46% -1.33%), K2O (0.84% - 0.01%), Na2O (3.6% -0.01%), MnO (0.3% - 0.04%), P2O5 (1.9% - 0.38%) and CaO (5% -0.02%) decrease from the bottom to the surface, however TiO2 (2.3% - 4.08%) remain constant, Fe2O3 (24.2% - 24,6%) and Al2O3 (14.5% - 45.2%) increase. The different weathering index such as, chemical index of alteration (55% - 99%), index of lateritization (41% - 103.5%) and Ruxton Ratio (0.12 - 3.21) just indicate an evolution of parent rock dominated by an alumina and iron phases under a control of hydrolysis phenomenon as bisialitisation, monosiallitisation and allitisation with the formation of minerals smectites group, kaolinite group gibbsite and iron oxides group. The fractionation patterns of rare earth elements (REE) show a positive and negative anomaly in Cerium and other rare earth elements, one more, the correlation between major, trace and REE prove a link of different pedological horizons developed on the basalt in redox condition.

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The formation of rare earth element scavenger minerals in weathering products derived from alkaline rocks of SE-Bahia, Brazil

Cited by 19 publications

References 2 publications

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

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

Chemical weathering intensity and geochemical characteristics of Cretaceous terrigenous clastic rock‐purple soil profiles in the Pushi area, Xichang

Geochemical and Petrographical Evolution of the Weathering Mantle Derived from Basalt in Bangam Locality (West-Cameroon): Implication in the Bauxitisation Process

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