Iron oxides in soils of different lithological origins in Ferriferous Quadrilateral (Minas Gerais, Brazil)

Filho, Amaury de Carvalho; Inda, Alberto Vasconcellos; Fink, Jessé Rodrigo; Curi, Nilton

doi:10.1016/j.clay.2015.08.037

Cited by 57 publications

(38 citation statements)

References 32 publications

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“…Quartz and magnetite/maghemite are the main constituents in silt and sand fractions while gibbsite, hematite, anatase and magnetite/maghemite in the clay fraction, corroborating other Brazilian authors (Curi and Franzmeier, 1987;Fontes et al, 2000;Costa et al, 2014;Cervi et al, 2014;Carvalho Filho et al, 2015) (Figures 2A,B and C;3A,B and C;and 4A,B and C). XRD patterns did not allow to differ clearly magnetite and maghemite in the soil fractions .…”

Section: Mineralogical Compositionsupporting

confidence: 78%

“…The Fe s content showed significant correlation (R 2 > 0.58, p < 0.01, n = 14) with χ LF values (Figures 6A, B and C), highlighting participation of parent material in the expression of soil magnetic properties (Lu, 2000;Lu, 2003;Hanesch et al, 2007;Silva et al, 2010;Camargo et al, 2014;Cervi et al, 2014;Carvalho Filho et al, 2015). However, soils with low Fe s content present low magnetic susceptibility, regardless of the color (Silva et al, 2010).…”

Section: ------------------------------------------10 -8 M 3 Kg -1 --mentioning

confidence: 99%

“…Therefore, even in highly weathered soils such as Oxisols, the parent material still plays an important geochemical role to influence the behavior of these soils in terms of TE contents. Carvalho Filho et al (2015) also showed the effect of the parent material in highly weathered soils and suggested re-evaluation of paradigms concerning the importance of the parent material only for poorly developed soils.…”

Section: Geochemistrymentioning

confidence: 99%

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Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Camêlo

Ker

Fontes

et al. 2018

Sci. agric. (Piracicaba, Braz.)

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Fe-rich Oxisols on mafic rocks in Brazil generally have high magnetic susceptibility with high contents of some trace elements. These are taxonomically similar soils; however, differences in magnetic and geochemical properties may affect agricultural or environmental usability and subsequent management. This study investigated the pedogenesis of Fe-rich Oxisols from various parent materials and evaluated the lithogenetic influence on magnetic susceptibility and trace elements contents. Soil samples were collected from Bw horizons in 13 Rhodic Oxisols and a Typic Oxisol developed from several parent materials in Minas Gerais State, Brazil. Soils were analyzed by X-ray diffractometry (XRD) and magnetometry. Soil chemical analyses consisted of sulfuric and total (tri-acid) digestions and selective Fe oxides dissolutions and statistical correlations were determined. Fe-rich Oxisols presented a typical mineralogical composition of highly weathered soils with structural stability. The results confirm the difficulty to identify accurately magnetic minerals in different grain sizes using XRD. However, coarse fractions still exert dominant influence on the magnetic properties of the Fe-rich Rhodic Oxisols. In addition, coarse fractions probably contribute to the enrichment of superparamagnetic particles for the clay fraction. Although highly weathered, Fe-rich Oxisols may have their geochemical attributes still controlled by the parent material, where trace elements seem to be correlated with the magnetic minerals in the coarse fractions. Thus, the natural replacement of some trace elements from soil-solution equilibrium reactions during plant development could be more effective in soils with higher magnetic particles concentrations in the coarse fractions.

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Section: Mineralogical Compositionsupporting

confidence: 78%

Section: ------------------------------------------10 -8 M 3 Kg -1 --mentioning

confidence: 99%

Section: Geochemistrymentioning

confidence: 99%

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Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Camêlo

Ker

Fontes

et al. 2018

Sci. agric. (Piracicaba, Braz.)

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“…Maghemite (Mh), ferromagnetic Fe oxide, is common in several soil classes in tropical and subtropical environments (Schwertmann and Taylor, 1989). Although it generally occurs in small amounts in some soil classes, Mh provides high magnetization to soils originating from basic igneous rocks (Fabris et al, 1997a;Costa et al, 1999) and other Fe-rich materials (Costa et al, 2014;Carvalho Filho et al, 2015). In Rhodic Oxisols developed from basic rocks, the Mh content increases considerably and may account for up to 40 % of the mass of the Fe oxide content in the clay fraction (Costa et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Pedogenic Iron Oxides in Iron-Rich Oxisols Developed from Mafic Rocks

Camêlo

Ker

Fontes

et al. 2017

Rev. Bras. Ciênc. Solo

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Despite the considerable amount of information on the mineralogical characteristics of pedogenic Fe oxides in Brazilian soils, there are few studies on Fe-rich soils developed from mafic rocks with taxonomic identities at lower categorical levels. This study evaluated the mineralogical characteristics of pedogenic Fe oxides in B horizons (Bw) of Fe-rich Oxisols developed from several mafic rocks in the state of Minas Gerais, Brazil. The Bw horizons were sampled at a 0.8-1.0 m depth in 13 Ferric and Perferric Rhodic Oxisols along with a Mesoferric Typic Oxisol originating from basalt, gabbro, tuffite, amphibolite and itabirite in Minas Gerais. The selected soils have taxonomic identities up to the fourth categorical level of the Brazilian System of Soil Classification. In the laboratory, the following analyses were made: a) powder X ray diffraction (XRD) of the clay fraction before and after selective concentration of Fe oxides by silicate alkaline dissolution (5 mol L-1 NaOH); b) selective chemical dissolution of the clay fraction by citrate-bicarbonate-dithionite (CBD), acid ammonium oxalate (AAO), and sulfuric acid (H 2 SO 4 1.8 mol L-1); c) quantitative estimation of minerals in the clay fraction through allocation of phases from the XRD patterns, magnetic susceptibility of the clay fraction, and quantification of elements after sulfuric acid digestion (H 2 SO 4 1:1) of the air-dried fine earth and treatment of the clay fraction with CBD; and d) estimation of the mean crystal size (MCS), specific surface area (SSA), and isomorphic Al-substitution (IS) of hematite, goethite, and maghemite from the XRD patterns obtained from concentrates of Fe oxides. The results showed that estimation of Fe content of maghemite by selective dissolution with 1.8 mol L-1 H 2 SO 4 may not be accurate enough to realistically reflect the maghemite contents in the soil sample. The Al content extracted may also be influenced by other minerals that are sources of this element. Hematite crystals were predominantly placoid in shape in all Rhodic Oxisols and had smaller SSA compared to goethite, which showed both isodimensional and asymmetric habit. Higher crystallinity of maghemite and the IS values generally lower than those of hematite and goethite suggest that in well-drained soils derived from mafic rocks, the IS phenomenon in maghemites seems to result from pedogenetic advancement after its formation from magnetite oxidation.

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“…Thus, the soil can behave as either a source or a drain of P, acquiring most of the P added to the soil by linkage to colloids and making it unavailable to plants. As the degree of weathering of these soils is increased, they become more electropositive, adsorbing anions such as phosphates (Novais and Smyth, 1999;Carvalho Filho et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus adsorption and its relationship to the physical and chemical characteristics with different soil classes

Neto¹,

Büll²,

Silva³

et al. 2018

Afr. J. Agric. Res.

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Iron oxides in soils of different lithological origins in Ferriferous Quadrilateral (Minas Gerais, Brazil)

Cited by 57 publications

References 32 publications

Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Pedogenic Iron Oxides in Iron-Rich Oxisols Developed from Mafic Rocks

Phosphorus adsorption and its relationship to the physical and chemical characteristics with different soil classes

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