Trace element geochemistry in Brazilian Cerrado soils

Marques, João José; Schulze, Darrell G.; Curi, Nilton; Mertzman, Stanley A.

doi:10.1016/j.geoderma.2003.10.003

Cited by 151 publications

(95 citation statements)

References 15 publications

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“…The presence of allochthonous material is plausible not only on the sites sampled in this study but also on most soils and similarly dissected landscapes. However, from the large differences among the soils investigated, it can be inferred that the possible presence of allochthonous material does not necessarily invalidate the representativeness of this study and the conclusion that mainly lithology controls the metal(loid) content (Kronberg et al, 1979;Marques et al, 2004b;Licht et al, 2006;Souza et al, 2015).…”

Section: Discussionmentioning

confidence: 72%

“…The high correlations between metal(loid) contents and soil properties for soils with different parent materials is attributed to the pedogenic process (Chen et al, 1999;Hamon et al, 2004;Marques et al, 2004b;Oliveira et al, 2014;Souza et al, 2015). The correlation coefficients between Fe, Al, and tri-pentavalent element contents were the strongest among all soil properties.…”

Section: Discussionmentioning

confidence: 93%

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Geochemical Signature of Amazon Tropical Rainforest Soils

Souza

Fontes

Gilkes

et al. 2018

Rev. Bras. Ciênc. Solo

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Evaluating soil geochemical diversity in the Amazon Basin has been a challenge largely because most study sites have been at the edge of the basin and it is difficult to get samples in such a region. Here we show that even among the most weathered soils, physicochemical soil properties express lithology. Our results are based on topsoil samples collected from different locations in minimally disturbed areas in the state of Amazonas, Brazil. Soil properties were measured using methods which are suitable for highly developed soils. The Chemical Index Alteration and Weathering Index of Parker was calculated based on the content of metal(loid)s in soils determined by X-ray fluorescence. Descriptive statistics, Pearson correlation, and Principal Component Analysis (PCA) were performed on data. In general, Amazon rainforest soils are more deeply weathered than soils in other Brazilian biomes and tropical rainforests in Asia and Africa. The high coefficient of variation of metal(loid) contents express pedogenesis and parent material diversity. Correlation analysis indicated that the tri-pentavalent elements are strongly associated with Al and Fe contents in the topsoil. In contrast, mono-divalent elements are correlated with sand and silt fractions. According to PCA, five soil groups with defined geochemical compositions and degrees of weathering could be identified: i) acidic sandy podzolized soils; ii) acidic loamy ferralitic soils with the highest content of tri-pentavalent ions; iii) acidic clayey kaolinitic soils with low metal(loid) contents; iv) acidic loamy kaolinitic soils with low metal(loid) contents; and v) silty neutral 2:1 clay soils. This study is the first effort to analyze the geochemical diversity in Amazon rainforest soils. These data are extremely valuable in determining the geochemical background for these soil types and this region. Geochemical variability can be predicted to some extent by lithology and pedogenesis, which can be applied to define the sampling required in future studies.

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Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 93%

Geochemical Signature of Amazon Tropical Rainforest Soils

Souza

Fontes

Gilkes

et al. 2018

Rev. Bras. Ciênc. Solo

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“…These include Ca, Mg, Ba, Cr, Rb, Co, Cu, Ni, Al, Cs, Sr, U and V. Among these elements, monovalent and divalent cations cannot be incorporated into the structures of kaolinite, gibbsite or goethite without producing an imbalance [44], and montmorillonite cannot incorporate them since Na is already enriched in all parts of the profile and might be incorporated into the interlayer space of this mineral. Al is pH-dependent.…”

Section: Mass Balance Evaluationmentioning

confidence: 99%

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

Tsozué

Ndjigui

2017

Geosciences

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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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“…Tal afirmação está de acordo com Marques et al (2004), os quais verificaram que, com a exceção do Mn, não havia diferença entre os teores de elementostraço na superfície e em horizontes subsuperficiais de solos preservados da ação antrópica no Cerrado brasileiro. De fato, a localização do perfil 2 na paisagem mostra que não deve sofrer influência recente de outra área, mas pode influenciar as demais áreas pelo arraste de materiais sólidos e águas na época das chuvas.…”

Section: Fator De Acumulaçãounclassified