Compositional and structural variabilities of Mg-rich iron oxide spinels from tuffite

Mussel, Wagner da Nova; Fabris, José Domingos; Coey, J. M. D.; Sans, L. M. A.; Lelis, M.F.F.

doi:10.1590/s0100-06831999000400005

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“…Grãos magnéticos desse tufito e de frações grosseiras do solo derivado tendem a preservar porções variáveis de magnetita (Fabris et al, 1995;Ferreira et al, 1997;Fabris et al, 1997a, b;Mussel et al, 1999).…”

Section: Introductionunclassified

Magnesioferrita e caminho pedogenético de transformação de óxidos de ferro magnéticos em dois perfis de solo derivados de tufito da região do Alto Paranaíba (MG)

Silva

Couceiro

Fabris³

et al. 2005

Rev. Bras. Ciênc. Solo

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Section: Introductionunclassified

Magnesioferrita e caminho pedogenético de transformação de óxidos de ferro magnéticos em dois perfis de solo derivados de tufito da região do Alto Paranaíba (MG)

Silva

Couceiro

Fabris³

et al. 2005

Rev. Bras. Ciênc. Solo

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Magnetita e sua transformação para hematita em um solo derivado de esteatito

Santana

Fabris

Goulart

et al. 2001

Rev. Bras. Ciênc. Solo

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SUMMARYThe main objective of this work was to characterize the magnetic minerals and to identify their pedogenic transformation on a steatite-forming soil of Minas Gerais, Brazil. The iron-rich spinel phase was characterized by chemical analysis, powder X-ray diffraction, Mössbauer spectroscopy, with and without an externally applied magnetic field of 6 tesla, and saturation magnetization measurements. Nearly stoichiometric and well-crystallized magnetite was the only magnetic mineral actually detected. The cubic unit cell parameter of the fresh rock magnetite was found to be a o = 0.8407(5) nm. Hematite (hexagonal cell; a = 0.5036(3) nm, c = 1.375(4) nm) was detected in the altered rock and in the sand-soil and silt-soil fractions. Magnetite is assumed to transform into hematite during pedogenesis through progressive oxidation of structural Fe 2+ to Fe 3+ . In partially oxidized magnetites, a relatively small proportion of Fe 3+ was interpreted as being uncoupled from the Fe 2+ -Fe 3+ charge transfer system, in octahedral sites of the spinel structure. Compositional formulae of magnetite with different degrees of non-stoichiometry are proposed. Ilmenite was found in minor proportions in the magnetically extracted portions from both rock and soil samples.Index terms: Iron-rich spinel, iron oxide, soapstone, magnetic soil, Mössbauer spectroscopy.(1) This work is part of the thesis of the first author, presented to the Departmento

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Compositional and structural variabilities of Mg-rich iron oxide spinels from tuffite

Abstract: SUMMARYIndex terms: magnetization, Mössbauer, magnetic soil. RESUMO: VARIABILIDADES COMPOSICIONAL E ESTRUTURAL DE ÓXIDOS DE FERRO RICOS EM Mg DE TUFITO

Cited by 2 publications

References 6 publications

Magnesioferrita e caminho pedogenético de transformação de óxidos de ferro magnéticos em dois perfis de solo derivados de tufito da região do Alto Paranaíba (MG)

Magnesioferrita e caminho pedogenético de transformação de óxidos de ferro magnéticos em dois perfis de solo derivados de tufito da região do Alto Paranaíba (MG)

Magnetita e sua transformação para hematita em um solo derivado de esteatito

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