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Platinum-group element contents of chromites from mafic–ultramafic layered flows, Abitibi greenstone belt, Ontario: implications for geochemical fractionation and mineral exploration

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Summary

¶The PGE contents of chromite separated from peridotite layers of Archaean mafic–ultramafic flows, Abitibi belt (Canada), indicate enrichment in Os–Ir–Ru (600 ppb) relative to Pd–Au (<5 ppb). Evidently, chromite was a sink for Ir–Os–Ru during melt-chromite fractionation in each of the flows. However, an additional phase, probably olivine, is required to explain the bulk Ir content of the sulphide-poor peridotites. In contrast, the chromite Pt contents range from <10 ppb to 400 ppb, with large variation in Pt/Ru (0.02–2.76) and Pt/Pd (5–400) ratios. The Pt enrichment may be related to the presence of Pt spinel structure compounds in oxidised melt, reflecting Fe–Ti spinel-related mineralisation in higher pyroxenite-gabbro layers.

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Authors and Affiliations

  1. Centre for Global Metallogeny, Department of Geology and Geophysics, University of Western Australia, Crawley, Australia, , , , , , AU

    W. E. Stone

  2. School of Geography and Geology, McMaster University, Hamilton, Ontario, Canada, , , , , , CA

    J. H. Crocket

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  1. W. E. Stone
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  2. J. H. Crocket
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Received December 5, 2002; revised version accepted January 7, 2003

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Stone, W., Crocket, J. Platinum-group element contents of chromites from mafic–ultramafic layered flows, Abitibi greenstone belt, Ontario: implications for geochemical fractionation and mineral exploration. Mineralogy and Petrology 78, 139–147 (2003). https://doi.org/10.1007/s00710-003-0231-x

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  • DOI: https://doi.org/10.1007/s00710-003-0231-x

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