Summary
This short communication reports the discovery and composition of the first Os-bearing rhenium sulphide. It occurs as a single euhedral crystal in the early Proterozoic Ekojoki Ni-Cu deposit in Finland, being enclosed by interstitial magmatic Fe-Ni sulphides. Electron microprobe analyses are most consistent with a general formula of Cu(Re,Os,Mo)5S9. The Re-Os model age calculations indicate that approximately 2/3 osmium is "common" Os that was accommodated by the sulphide at the time of crystallisation, 1/3 being produced via post-crystallisation decay of187,Re to18 7Os. We propose that this sulphide crystallised from an immiscible sulphide liquid that was unusually rich in rhenium due to extensive assimilation of black schist sulphides by the magma.
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Peltonen, P., Pakkanen, L. & Johanson, B. Re-Mo-Cu-Os sulphide from the Ekojoki Ni-Cu deposit, SW Finland. Mineralogy and Petrology 52, 257–264 (1995). https://doi.org/10.1007/BF01163248
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DOI: https://doi.org/10.1007/BF01163248