Pedogeoquímica em perfis de alteração na região de Lavras (MG). II - elementos menores e elementos das terras raras

Lacerda, Marilusa Pinto Coelho; Andrade, Humber Agrelli; Quéméneur, J. J. G.

doi:10.1590/s0100-06832002000100009

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…They are defined, from the bottom to the top of the profile, as the R Horizon (Fresh rock facies), the C Horizon (Alterite facies), the B Horizon (Transition facies) and the A Horizon (Solum facies). The nomenclature cited in parenthesis was adopted according to Lacerda et al, (2002).…”

Section: Petrography and Mineralogical Characterizationmentioning

confidence: 99%

Pedogeochemistry of ultramafic soils from the Córrego dos Boiadeiros Body, Quadrilátero Ferrífero, Minas Gerais, Brazil

2018

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The Córrego dos Boiadeiros Body (CBB) comprises a metaultramafic-metamafic sequence located in the vicinities of Nova Lima town, central area of the Quadrilátero Ferrífero province. The main rock type is a serpentinite that grades upwards to weathering mantles with well-preserved pedogenetic horizons composed, from bottom to top, of four facies: the R Horizon (Fresh rock facies), the C Horizon (Alterite facies), the B Horizon (Transition facies) and the A Horizon (Solum facies). This article presents the results of geochemical and mass balance studies along a representative pedogenetic profile in order to evaluate the chemical transformations concerning major, trace and Rare Earth Elements. From bottom to top of the selected profile, there is enrichment in Fe 2 O 3 , Al 2 O 3 and depletion in MgO and SiO 2. There are also relative gains of metallic elements as Ni, Co, V and loss of Au. Cr is enriched at the uppermost horizon. Pt is enriched at the basis of the profile, but decreases towards the upper layers. The weathering mantle is REE-enriched and shows major fractionating of LREE over HREE. In order to evaluate the economic potential of the lateritic deposits, especially concerning Cr content, additional chemical analyses should be distributed over the entire body and its surroundings.

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Section: Petrography and Mineralogical Characterizationmentioning

confidence: 99%

Pedogeochemistry of ultramafic soils from the Córrego dos Boiadeiros Body, Quadrilátero Ferrífero, Minas Gerais, Brazil

2018

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Synthesis of proximal sensing, terrain analysis, and parent material information for available micronutrient prediction in tropical soils

et al. 2018

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Portable X-ray fluorescence (pXRF) applications in tropical Soil Science

Ribeiro

Silva

et al. 2017

Ciênc. agrotec.

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The X-ray fluorescence (XRF) is an analytical technique for determination of elemental composition of different materials. In soils, the XRF has many pedological, environmental and agronomic applications, mainly after the emergence of portable equipments (pXRF). This technique has been recently adopted and successfully used for soil characterization worldwide, but very rare works have been carried out in soils of developing countries. The soil characterization includes the complete elemental composition determination (nutrients, trace and rare-earth elements) and allows estimating some soil physical and chemical properties. In Brazil, this technique is still incipient, mainly the use of pXRF, however, it can greatly contribute to soil characterization in-field or in-lab conditions and also replacing methods of soil analyses considered non-environmentally friendly. This review summarizes the XRF technique including principles and the main applications of pXRF in soils highlighting its potential for tropical Soil Science.Index terms: Soil analyses; soil morphometrics; soil characterization. RESUMOFluorescência de raios-X (FRX) é uma técnica analítica para determinação da composição elementar de diferentes materiais. Em solos, a FRX apresenta muitas aplicações pedológicas, ambientais e agronômicas, principalmente após a emergência de equipamentos portáteis (pXRF). Essa técnica tem sido utilizada com sucessso no mundo todo para caracterização do solo, entretanto, são raros os trabalhos em solos de países em desenvolvimento. A caracterização do solo inclui a determinação completa da composição elementar (nutrientes, elementos-traço e terras-raras) e permite a estimativa de atributos químicos e físicos do solo. No Brasil, a FRX é ainda incipiente, principalmente o uso do pXRF, entretanto, essa técnica pode contribuir grandemente para a caracterização do solo no campo, em condições laboratoriais e, também, substituindo alguns métodos de análise do solo considerados não prejudicial ao ambiente. Esta revisão sumariza a técnica de FRX incluindo princípios e as principais aplicações do pXRF, destacando seu potencial de uso na Ciência do Solo tropical. Termos para indexação:Análise do solo; morfometria do solo; caracterização do solo.

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Pedogeoquímica em perfis de alteração na região de Lavras (MG). II - elementos menores e elementos das terras raras

Abstract: RESUMO Na região de Lavras, MG, analisou-se o comportamento geoquímico dos elementos menores (EM) e elementos das terras raras (ETR

Cited by 4 publications

References 9 publications

Pedogeochemistry of ultramafic soils from the Córrego dos Boiadeiros Body, Quadrilátero Ferrífero, Minas Gerais, Brazil

Pedogeochemistry of ultramafic soils from the Córrego dos Boiadeiros Body, Quadrilátero Ferrífero, Minas Gerais, Brazil

Synthesis of proximal sensing, terrain analysis, and parent material information for available micronutrient prediction in tropical soils

Portable X-ray fluorescence (pXRF) applications in tropical Soil Science

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