How chalcophile is rhenium? An experimental study of the solubility of Re in sulphide mattes

Fonseca R.O.C., Mallmann G., St.C.O'Neill H. and Campbell I.H. (2007) How chalcophile is rhenium? An experimental study of the solubility of Re in sulphide mattes. Earth and Planetary Science Letters, 260 3-4: 537-548. doi:10.1016/j.epsl.2007.06.012

Author Fonseca R.O.C.
Mallmann G.
St.C.O'Neill H.
Campbell I.H.
Title How chalcophile is rhenium? An experimental study of the solubility of Re in sulphide mattes
Journal name Earth and Planetary Science Letters   Check publisher's open access policy
ISSN 0012-821X
Publication date 2007-08-30
Sub-type Article (original research)
DOI 10.1016/j.epsl.2007.06.012
Volume 260
Issue 3-4
Start page 537
End page 548
Total pages 12
Language eng
Subject 1906 Geochemistry and Petrology
1908 Geophysics
1901 Art Theory and Criticism
Abstract Although the Re/Os isotopic system has proved to be a valuable aid in understanding the evolution of the Earth's mantle, interpretation of the data is currently hindered by limited knowledge of the high-temperature geochemical behaviour of Re. In particular, the extent to which Re in the mantle is hosted by sulphide or silicate phases is poorly known. We report the results of an experimental study of the solubility of Re in sulphide melts (called here "mattes") coexisting with a Re-rich Re-Fe alloy in the system Fe-Re-S-O over a range of fO 2, fS 2 and temperatures, which allow extrapolation to conditions pertinent to the Earth's mantle. The solubility of Re in mattes increases with increasing fS 2, with Re dissolving as Re 4+ at high fS 2 and Re 0 at low fS 2. The effect of fO 2 is negligible except at high fO 2 where O in the matte becomes important. At constant fS 2, an increase in temperature leads to an increase in the solubility of Re 0 in the matte, but a decrease in the solubility of Re 4+. These results, coupled with data for the Re solubility in silicate melts taken from the literature, allow the calculation of Re matte/silicate-melt partition coefficients (D Re matte/sil) for a range of conditions. The calculated D Re matte/sil show a large dependence on fO 2, and a lesser dependency on fS 2, with Re behaving as a chalcophile element for relatively reduced MORB-type mantle and as a lithophile element for the oxidised sources of island-arc basalts. The sensitivity of Re to fS 2 and fO 2 reconciles the apparent discrepancies between previous estimates of this parameter, which can vary by more than five orders of magnitude within the range of fS 2 and fO 2 covered by terrestrial basaltic magmas.
Keyword chalcophile
oxygen fugacity
partition coefficients
sulphur fugacity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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