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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 49-53; DOI: 10.1180/minmag.2008.072.1.49
© 2008 Mineralogical Society of Great Britain and Ireland
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Session I: Mineral weathering

Can chromite weathering be a source of Cr in soils?

J. Garnier1,2, C. Quantin1,3, E. Guimarães2 and T. Becquer4

1 UMR 8148 IDES, UPS11-CNRS, Bât. 504, 91405 Orsay Cedex, France
2 UNB, IG/GMP-ICC Centro, Campus Universitario Darcy Ribeiro, 70919-970, Brasilia-DF, Brazil
3 IRD UMR LISAH, Sup Agro, Bât.12, 34060 Montpellier Cedex 2, France
4 IRD, UMR 137 BioSol, Univ. Paris VI and XII, Embrapa Cerrados, CP 7091, 71619-970, Brasilia-DF, Brazil

* E-mail: jeremie.garnier{at}u-psud.fr

ABSTRACT

At Niquelândia, Cr extracted from the soil (5,000–9,300 mg.kg–1) is likely the result of the Cr-bearing Fe-oxides compared to the Cr-spinels, showing that low Cr-containing minerals present in the dunite (enstatite, olivine and clay minerals) have been completely dissolved. The chromites, accumulated inside soil profiles, have undergone chemical weathering, leading to a Cr enrichment during soil genesis. Traces of dissolution inside the soil chromites suggest that they can be slowly weathered. In this case chromites could represent a diffuse source of available Cr(III) within the soil profiles.






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