Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2301e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 9, pp.2301-2309
Other
3
Scientific paper
Fahlerz group sulfosalts having the general structural formula (Ag, Cu) III 6 [(Ag, Cu) 2/3 (Fe, Zn) 1/3 ] IV 6 (As, Sb) 4 S 13 have been equilibrated with the assemblage electrum + pyrite + chalocopyrite in reversed exchange experiments. Control of log ( a s ) at -6.0 was maintained by abundant FeS 2 + (Fe .05 Zn .95 )S and minimum vapor space. Reversal brackets demonstrate that the Ag /( Ag + Cu ) and As /( As + Sb ) ratios in this sulfosalt are strongly correlated, at a fixed composition of coexisting electrum. Evaluated in the context of the thermochemical model of et al. (1987), these results indicate that the molar Gibbs energy of the reciprocal reaction Ag 10 Fe 2 Sb 4 S 13 + Cu 10 Fe 2 As 4 S 13 Ag 10 Fe 2 As 4 S 13 + Cu 10 Fe 2 Sb 4 S 13 , ( ) is 12.25 ± 1.92 kilocalories. This provides a crucial missing parameter for the thermodynamic calculations we have developed earlier. This model is applied to calculation of end-member activities; integration with studies of hydrothermal fluids in ore-forming systems is planned.
Ebel Denton S.
Sack Richard O.
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