Rare-earth-element geochemistry in soils developed in different geological settings of Cuba

Alfaro, Mirelys Rodríguez; Nascimento, Clístenes Williams Araújo do; Biondi, Caroline Miranda; Silva, Ygor Jacques Agra Bezerra da; Silva, Yuri Jacques Agra Bezerra da; Accioly, Adriana María de Aguiar; Montero, A.; Ugarte, Olegário Muñiz; Estévez, J.

doi:10.1016/j.catena.2017.10.031

Cited by 61 publications

(21 citation statements)

References 47 publications

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“…The REE concentrations in S‐type granites were normalized to the Upper Continental Crust (UCC) ( Taylor and McLennan , ; La: 30.0 mg kg −1 ; Ce: 64.0 mg kg −1 ; Pr: 7.10 mg kg −1 ; Nd: 26.0 mg kg −1 ; Sm: 4.50 mg kg −1 ; Eu:0.88 mg kg −1 ; Gd: 3.80 mg kg −1 ; Yb: 2.20 mg kg −1 ; Lu: 0.320 mg kg −1 ; Dy: 3.50 mg kg −1 ; Er: 2.30 mg kg −1 ; Ho: 0.80 mg kg −1 ; Tb: 0.640 mg kg −1 ; and Tm: 0.330 mg kg −1 ). The UCC has been frequently applied for this purpose ( e.g ., Taylor and McLennan , ; Laveuf and Cornu , ; Pédrot et al., ; Vermeire et al., ; da Silva et al., ; Alfaro et al., ; Cunha et al., ).…”

Section: Methodsmentioning

confidence: 99%

“…It is common knowledge that the lower mobility of LREE compared to HREE causes LREE enrichment, whereas HREE depletion with increasing weathering intensity (Nesbitt, 1979;Duddy, 1980;Cao et al, 2016;da Silva et al, 2017 Dy: 3.50 mg kg -1 ; Er: 2.30 mg kg -1 ; Ho: 0.80 mg kg -1 ; Tb: 0.640 mg kg -1 ; and Tm: 0.330 mg kg -1 ). The UCC has been frequently applied for this purpose (e.g., Taylor and McLennan, 1985;Laveuf and Cornu, 2009;Pé drot et al, 2015;Vermeire et al, 2016;da Silva et al, 2017;Alfaro et al, 2018;Cunha et al, 2018).…”

Section: Rare Earth Elements Analysesmentioning

confidence: 99%

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Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Silva

Nascimento

Biondi

et al. 2018

J. Plant Nutr. Soil Sci.

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S‐type granites are igneous rock types that are widespread in all continental crust. These granites play a key role in global weathering patterns and can be important economic ores of rare earth elements (REEs). This study provides insights into the geochemical and mineralogical signatures of REEs in S‐type granites and their derived soil profiles along a climosequence from dry to humid climates of Brazil. Mineralogical, petrographic, geochemical and soil analyses (physical and chemical) were used to evaluate the geochemistry of REEs in rock and soil samples. The granites were characterized as strongly peraluminous, being classified as typical S‐types. Both the granites and their derived soils contained high contents of REEs, with monazite and apatite being the major source of REEs. The high enrichment of light REEs (LRREs) in monazite and apatite explained the REE fractionation evidenced in the S‐type granites. The normalized REE distribution patterns for soil profiles along the climosequence revealed the fractionation between light and heavy REEs (HREEs). The ratio of La/YbN > 1 also confirmed the LREEs/HREEs fractionation. The mineralogical composition of the parent material and the clay minerals (kaolintes) seemed to govern the fractionation between LREEs and HREEs in these soils. Chemical index of alteration (CIA) values, REE fractionation and kaolinite proportions in soil profiles increased from dry to humid climates. These results suggest that the degree of weathering plays an important role in the type and volume of secondary minerals, as well as the REE fractionation. Among the phyllosilicates, kaolinite seems to be the most important adsorbent of light REE. The higher positive Eu anomalies with advanced weathering are explained by the breakdown of plagioclase. The weathering of monazite and apatite was the main reason for the slight negative Ce anomalies in the soil profiles. This study can be used to comprehend the geochemistry of REEs in other parts of the tropics underlain by S‐type granites.

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Section: Methodsmentioning

confidence: 99%

Section: Rare Earth Elements Analysesmentioning

confidence: 99%

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Silva

Nascimento

Biondi

et al. 2018

J. Plant Nutr. Soil Sci.

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“…These findings demonstrate that, regardless of climatic conditions, the parent material factor highly influences REE geochemistry in soils. Several authors have observed that large variations in REE contents in soils are highly dependent on the types of parent material they are derived from (Hu et al, 2006b;Silva et al, 2017;Alfaro et al, 2018). Soils developed from different parent materials that formed under the same climatic condition (sub-humid zone) exhibited different geochemical signatures of LREE and HREE in soils (Figures 3a and 3b).…”

Section: Natural Content and Reference Values Of Rees In Rn Soilsmentioning

confidence: 99%

“…Some authors have observed a high correlation between REEs and Fe in tropical soils (Silva et al, 2016;Alfaro et al, 2018). This is logical because the process of weathering and crystallization of Fe oxides can release REEs.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast

Silva

Barbosa

Nascimento

et al. 2018

Rev. Bras. Ciênc. Solo

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Growth in the agricultural and industrial sectors has increased the demand for rare earth elements (REEs) in the production of technological devices and fertilizers. Thus, the accumulation of these elements in the soil has become an environmental concern. Here, we aim to determine the natural contents of REEs in soils derived from different parent materials and under climatic conditions ranging from humid to semi-arid. We then evaluate the influence of major elements and soil properties on the geochemistry of REEs. The contents of REEs were determined using inductively coupled plasma optical emission spectroscopy. Major elements were determined by X-ray fluorescence spectrometry. The mean content of REEs in soils from Rio Grande do Norte (RN), Brazil, were in the followed order (mg kg -1 ): Ce (40.4) > La (18.9) > Nd (15.8) > Pr (7.3) > Sm (3.0) > Gd (2.6) > Dy (1.0) > Er (0.7) > Yb (0.6) > Eu (0.5) = Tb (0.5) > Ho (0.3) > Lu (0.2). The parent material was the main factor that governed the geochemistry of the REEs in soils of RN. Higher levels of REEs were observed in soils derived from igneous and metamorphic rocks. In contrast, sedimentary rocks -except for the region formed from limestone -generated soils with lower contents of REEs in the state. In addition, soils developed from the same parent material and under different climatic conditions showed the same geochemical signatures for REEs in soils. These results confirm the small effect of climate on REE geochemistry in soils of RN and lead to the conclusion that the geochemical signature of REEs in these soils reflects the composition of the underlying parent material. The lack of significant correlation between (La/Yb) N ratio and the Chemical Alteration Index also confirms the low influence of climate on soil REE geochemistry. Among the major elements, Fe and Si had a greater influence on soil REE geochemistry. Higher REEs were seen in areas with more Fe and less Si. These REE levels were clearly controlled by the type of parent material. The Nd, Sm, Tb, Dy, Ho, Yb, and Er levels showed strong spatial dependence; this dependence was moderate for the Pr, La, Ce, Eu, Gd, and Lu levels. Spatial variability maps of REEs are particularly important to identify areas under environmental impact. Our results represent the most detailed study of the surface geochemistry of REEs in Brazilian soils and contribute to the scarce data available on these elements in Brazil.

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“…Rare earth elements (REEs) are commonly divided into light REEs (LREE: La to Eu) and heavy REEs (HREEs: Gd to Lu) based on their atomic weights and radii [27,28]. Under natural conditions, concentrations of REEs show two distinctive characteristics: (1) They generally tend to decrease from La to Lu; (2) REEs with even atomic numbers have higher concentrations than neighboring elements.…”

Section: Data Treatmentmentioning

confidence: 99%

Geochemical Distribution Characteristics of Rare Earth Elements in Different Soil Profiles in Mun River Basin, Northeast Thailand

et al. 2020

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Exploring the distributions of rare earth elements (REEs) in soil profiles is essential to understanding how natural and anthropogenic factors influence the geochemical behaviors of REEs. This study aimed to learn about the distribution characteristics of REEs in soils, including their fractionation and enrichment, and to explore the influence of soil pH and soil organic carbon (SOC) on REEs. One hundred and three samples were collected from six soil profiles under different land uses (paddy field: T1, T3; forest land: T2, T6; wasteland: T4; building site: T5) in the Mun River Basin, Northeast Thailand. The average total REE contents (∑REE) are much lower (<80 mg kg−1) than that of Earth’s crust (153.80 mg kg−1) in soil profiles T2, T3, T4, and T6. The contents of REEs tend to increase slightly with depth in all soil profiles. The ratios of (La/Yb)N range from 0.35 to 0.96 in most samples, indicating that the enrichment of heavy REEs (HREEs) relative to light REEs (LREEs) is the main fractionation pattern. Samples from profile T2 show relatively obvious negative Ce anomalies (0.55–0.78) and positive Eu anomalies (1.41–1.56), but there are almost no anomalies of Ce and Eu in other soil profiles. Enrichment factors of LREEs (EFLREEs) range from 0.23 to 1.54 and EFHREEs range from 0.34 to 2.27, which demonstrates that all soil samples show no LREE enrichment and only parts of samples show minor HREE enrichment. Soil organic carbon (SOC) contents positively correlate with the enrichment factors of REEs (EFREE) in soil profiles T1 (R = 0.56, p < 0.01) and T6 (R = 0.71), while soil pH values correlate well with EFREE in soil profiles T2 (R = 0.75) and T4 (R = −0.66, p < 0.01), indicating the important influence of soil pH and SOC on the mobility of REEs in some soil profiles.

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Rare-earth-element geochemistry in soils developed in different geological settings of Cuba

Cited by 61 publications

References 47 publications

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast

Geochemical Distribution Characteristics of Rare Earth Elements in Different Soil Profiles in Mun River Basin, Northeast Thailand

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