Journal
CHEMICAL GEOLOGY
Volume 281, Issue 1-2, Pages 125-132Publisher
ELSEVIER
DOI: 10.1016/j.chemgeo.2010.12.003
Keywords
Iodine; Pt-Pd nuggets; Corrego Bom Sucesso; Minas Gerais; Brazil
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Funding
- Deutsche Forschungsgemeinschaft [LE 578/29-1]
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Synchrotron radiation-induced X-ray fluorescence (SR-XRF) spectrometry was applied to determine iodine concentrations in alluvial Pt-Pd aggregates with delicate morphological features from Corrego Bom Sucesso, Minas Gerais, Brazil. The millimetre-sized botryoidal and rod-shaped grains of alluvial Pt-Pd-Hg intermetallic compounds have surprisingly high concentrations of iodine, in the range from 10 to similar to 120 mu g/g. Because iodine is a strongly biophile element, known to be enriched in peatlands and plant remains in soils by microbial activity, its concentration in the Pt-Pd nuggets suggests biogenic precious-metal fixation in the aqueous alluvial milieu. Biogenic and inorganic processes, such as bioreduction and electrochemical metal accretion, could mutually have contributed to the growth of nanoparticles, formed on organic templates, to millimetric Pt-Pd nuggets. (C) 2010 Elsevier B.V. All rights reserved.
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