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The Titanomagnetite to Titanomaghemite Conversion in a Weathered Basalt Profile From Southern Paraná Basin, Brazil

Published online by Cambridge University Press:  01 January 2024

Marisa T. Garcia de Oliveira ,
Milton L. L. Formoso ,
Moacir Indio da Costa Jr  and
Alain Meunier
Marisa T. Garcia de Oliveira*
Affiliation:
Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, 91509-900 Porto Alegre, Brazil
Milton L. L. Formoso
Affiliation:
Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, 91509-900 Porto Alegre, Brazil
Moacir Indio da Costa Jr
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonççalves, 9500, 91501-970, Porto Alegre, Brazil
Alain Meunier
Affiliation:
Hydrasa UMR 6532 CNRS – University of Poitiers, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
*
*E-mail address of corresponding author: marisa.oliveira@ufrgs.br
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Abstract

This study of magnetic minerals in a weathering profile developed on plateau basalts of the subtropical southern Paraná Basin explores the evolution of titanomagnetite to titanomaghemite. Six samples studied by optical microscopy, X-ray diffraction (XRD), electron microprobe, Mössbauer spectroscopy (MS) and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) support the interpretations.

The profile studied has two major parts: an upper, porous red-clay Latosol, ∼2–8 m deep, separated by a stone line from an underlying alterite which has two different facies — its argillaceous alterite consists of a clayey matrix with a well-developed fissure system whereas the underlying boulder alterite consists of rock cores surrounded by highly-porous cortexes of Al-goethite.

Optical microscopy showed the titanomagnetite-titanomaghem ite changes in color and shape through the profile. The decrease in the lattice parameter a of the magnetic separates from the rock cores to the alterite facies was detected by XRD. Mössbauer spectroscopy identified non-stoichiometric magnetite in the rock cores and Ti-substituted maghemite in the argillaceous alterite. Chemical analysis of the titanomagnetite-titanomaghe mite grains showed that the relative proportions of TiO2 and Fe2O3 vary in the different weathering facies. By SEM and EDS we also detected the presence of minor components as Si, Al, Ca, K, Mg and Mn.

These results led to the interpretation that the titanomagnetites from the fresh Parana basalts, located in the subtropical zone of Brazil, are unstable and gradually change to titanomaghemites. The evolution of these magnetic minerals is registered in the weathering facies related to climatic changes throughout geological time.

Keywords

Magnetic MineralsTitanomaghemiteTitanomagnetiteSoilsWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 4 , August 2002 , pp. 478 - 493
Copyright
Copyright © 2002, The Clay Minerals Society

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