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Quantification and Characterization of Maghemite in Soils Derived from Volcanic Rocks in Southern Brazil

Published online by Cambridge University Press:  28 February 2024

Antonio Carlos S. da Costa
Affiliation:
Departamento de Agronomia, Universidade Estadual de Maringá, Maringá-PR, CEP 87020-900, Brazil
Jerry M. Bigham
Affiliation:
School of Natural Resources, The Ohio State University, Columbus, Ohio 43210, USA
Fred E. Rhoton
Affiliation:
National Sedimentation Laboratory, USDA-ARS, Oxford, Mississippi 38655, USA
Samuel J. Traina
Affiliation:
School of Natural Resources, The Ohio State University, Columbus, Ohio 43210, USA

Abstract

Many soils developed from volcanic rocks in southern Brazil exhibit spontaneous magnetization caused by the presence of fine-grained maghemite (γ-Fe2O3), but few attempts were made to quantify or characterize this important soil component. To that end, clays were separated from freely drained soils derived from acid (≥63% SiO2), intermediate (54–62% SiO2), and basic (≤53% SiO2) igneous rocks produced by the Paraná flood volcanism. The sample set included soils with a wide range of pedogenic development on different landscape positions. The Fe oxide mineralogy of these samples was examined by using a combination of selective dissolution, magnetic susceptibility, and X-ray diffraction (XRD) techniques. Hematite and maghemite were the primary Fe oxides in mature soils (Oxisols, Ultisols, and Alfisols) developed from basic rocks; whereas goethite was dominant in all other soils, especially those formed from acid-intermediate rocks. The association of maghemite with basic rock materials suggests that it was primarily formed by oxidation of lithogenic magnetite. A strong, positive correlation (R2 = 0.89) was obtained between mass specific magnetic susceptibility (χ) of the clay fractions and maghemite contents estimated by XRD. Either method could be used for quantitative analyses, but χ was more sensitive than XRD at low maghemite concentrations (<2 wt. %). The clay-sized maghem-ites were superparamagnetic with an estimated value for the mass specific magnetic susceptibility (χlf) value of 91,000 × 10−8 m3 kg−1 and frequency dependent variations of 10–15%. The maghemites also had low unit cell constants, which, if attributed entirely to replacement of Fe by Al, would correlate with Al substitutions in the range of 5–16 mole %. Selective dissolution of the soil maghemites was achieved by treatment of Fe oxide concentrates with 1.8 M H2SO4 at 75°C for 2 h.

Type
Research Article
Copyright
Copyright © 1999, The Clay Minerals Society

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