Maghemite quantification and magnetic signature of Brazilian soils with contrasting parent materials

Pôggere, Giovana Clarice; Inda, Alberto Vasconcellos; Barrón, Vidal; Kämpf, N.; Brito, Angela Dayana Barrera de; Barbosa, Julierme Zimmer; Curi, Nilton

doi:10.1016/j.clay.2018.05.014

Cited by 37 publications

(29 citation statements)

References 42 publications

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“…The mineralogical composition of soils was consistent with reports of other authors regarding Fe-rich Rhodic Oxisols (Latossolos Vermelhos) derived from mafic rocks (Costa et al, 2014;Carvalho Filho et al, 2015;Camêlo et al, 2018;Poggere et al, 2018). Regardless of the particle size, the XRD analysis was not efficient in differentiating the ferrimagnetic Fe oxides, Mt, and Mh, because they present very similar XRD peaks, limiting an accurate identification (Fontes et al, 2000;Camêlo et al, 2018).…”

Section: Mineralogical Studysupporting

confidence: 85%

“…The refinement consisted of a polynomial function to the baseline, the peaks were set through the pseudo-Voigt model and the angle parameters of Bragg U, V, and W to calculate the width at half height (WHH), where WHH = (Utan 2 θ + Vtanθ + W) 1/2 (Caglioti et al, 1958). The refinement quality was evaluated by the R exp index (Young, 1995), where values up to 20 are considered acceptable (Poggere et al, 2018).…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Iron contents extracted from clay fraction with H 2 SO 4 1.8 mol L -1 (Fe sulf ) (Schwertmann and Fechter, 1984) were related to the time when clay fraction residues reached χ lf <10 % of the value before extraction. This is an adaptation of the method proposed by Schwertmann and Fechter (1984), as performed by Poggere et al (2018). The elements obtained by extractors were quantified by atomic absorption spectrometry.…”

Section: Geochemical Analysesmentioning

confidence: 99%

“…In Brazil, these soils occur mainly in the central-western, southeastern, and southern regions and are generally derived from mafic rocks, such as basalt, gabbro, diabase, tuffite, and itabirite. Rhodic Oxisols exhibit strong magnetic attraction due to high contents of ferrimagnetic Fe oxides (maghemite and magnetite) (Costa et al, 1999(Costa et al, , 2014Camêlo et al, 2018;Poggere et al, 2018). These minerals have often been used in studies on pedogenesis (Silva et al, 2017;Camêlo et al, 2018) for stratification of environments (Ramos et al, 2017) and soil fertility (Costa et al, 2018) in Brazil and elsewhere in the world.…”

Section: Introductionmentioning

confidence: 99%

“…In soils originating from mafic rocks, maghemite usually originates from aerial oxidation of magnetite inherited from the parent material (Fontes and Weed, 1991;Camêlo et al, 2018). Therefore, several authors have reported on magnetite predominance in the coarse fractions (sand and silt) and maghemite in the clay fraction (Costa et al, 1999;Carvalho Filho et al, 2015;Camêlo et al, 2018;Poggere et al, 2018) of Fe-rich Rhodic Oxisols in Brazil. However, it is known that both minerals can display distinct soil size fractions or occur in all of them (Causevic et al, 2004;Maxbauer et al, 2016;Silva et al, 2017;Costa et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Mineralogical Evolution of Magnetic Rhodic Oxisols under Different Lithological Influences in Brazil

FILHO

Ker

Fontes

et al. 2019

Rev. Bras. Ciênc. Solo

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Ferrimagnetic Fe-oxides are important soil components, which are present in most of the agricultural soils of Brazil. Distinction, origin, and assessment of the influence of these minerals on magnetism and geochemistry is a challenge for mineralogists. This study aimed to characterize mineralogically Fe-rich Rhodic Oxisols (Latossolos Vermelhos) originating from several mafic rocks in Brazil, and assess the implications on their magnetic and geochemical properties. We present results on magnetic measurements, chemical dissolutions, X-ray diffractometry, Rietveld refinement, Raman, and Mössbauer spectroscopies of Fe-rich Rhodic Oxisols originating from several mafic rocks. They show that magnetite is inherited from the parent material, and its oxidation leads to the formation of maghemite. In the coarse fractions (sand and silt), magnetite and maghemite coexist and are interstratified with hematite, confirmed by Raman spectroscopy. This limited the distinction between magnetite and maghemite by Mössbauer spectroscopy. Maghemite represents the only ferrimagnetic Fe oxide in the clay fraction. The influence of both ferrimagnetic minerals, magnetite and maghemite, on magnetic susceptibility and total content of trace elements is determined by the pedogenic development, even among highly weathered soils. In general, the coarse fractions contribute with most of the total trace element contents, while the clay fraction contributes to trace elements availability and magnetic susceptibility of soils.

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Section: Mineralogical Studysupporting

confidence: 85%

Section: X-ray Diffractionmentioning

confidence: 99%

Section: Geochemical Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mineralogical Evolution of Magnetic Rhodic Oxisols under Different Lithological Influences in Brazil

FILHO

Ker

Fontes

et al. 2019

Rev. Bras. Ciênc. Solo

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Magnetic susceptibility in the prediction of soil attributes in southern Brazil

Ramos

Inda

Barrón

et al. 2021

Soil Science Soc of Amer J

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Global demand for soil information has led to investigations that have adopted ways to estimate soil attributes quickly and effectively. In this context, magnetic susceptibility (χ) has gained prominence because it is a technique capable of estimating other attributes that are more difficult to acquire. This study aimed to (a) evaluate the performance of χ for the prediction of sand, silt, clay, hue, hematite/(hematite + goethite) ratio, Fe content of pedogenic iron oxides, and remaining phosphorus and (b) develop maps of χ, soil attributes and attributes predicted by χ in the state of Rio Grande do Sul (RS), Brazil. Here, 198 soil samples under forest and native pasture were used for testing the potential of χ as a predictive technique, separating the data into calibration (nc = 149) and validation sets (nv = 49). Linear regression was used to obtain the pedotransfer equations according to soil classes and lithology. To visualize the distribution of the values of χ and other soil attributes in RS, maps were made with the real values of χ and the real and estimated values of soil attributes. The great range of the χ values and related attributes was associated with the lithological and pedological influence, allowing the construction of predictive models that encompass a large gradient of χ. In the predictions made in groups, the attributes of Oxisols and Ultisols were best estimated by χ; however, among the lithology groups, the extrusive igneous rocks stood out.

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Assessing soil contamination in automobile scrap yards by portable X-ray fluorescence spectrometry and magnetic susceptibility

Barbosa

Pôggere

Teixeira

et al. 2019

Environ Monit Assess

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Maghemite quantification and magnetic signature of Brazilian soils with contrasting parent materials

Cited by 37 publications

References 42 publications

Mineralogical Evolution of Magnetic Rhodic Oxisols under Different Lithological Influences in Brazil

Mineralogical Evolution of Magnetic Rhodic Oxisols under Different Lithological Influences in Brazil

Magnetic susceptibility in the prediction of soil attributes in southern Brazil

Assessing soil contamination in automobile scrap yards by portable X-ray fluorescence spectrometry and magnetic susceptibility

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