The solubility of gold in hydrogen sulfide gas: An experimental study

The partitioning behavior of silver in a vapor–brine–rhyolite melt assemblage

“…The partitioning behavior of silver between vapor and brine, vapor and melt, and brine and melt remains relatively constant over run durations varying from 111 to 560 h as shown in Figs. 3-5. The time invariance of the partitioning data is inferred to reflect the achievement of equilibrium in agreement with previous experimental studies (Giggenbach, 1975(Giggenbach, , 1992Candela and Holland, 1984;Webster, 1992;Gammons and Williams-Jones, 1995a,b;Jugo et al, 1999;Archibald et al, 2002a,b;Frank et al, 2002;Simon et al, 2004Simon et al, , 2005Simon et al, , 2006Simon et al, , 2007aRepel et al, 2006;Zezin et al, 2007). The synthetic fluid inclusions have bulk salinities which agree with predictions based on extant data (Sourirajan and Kennedy, 1962;Henley and McNabb, 1978;Roedder, 1984; Na mg/g (±2r)…”

Gold and copper in volatile saturated mafic to intermediate magmas: Solubilities, partitioning, and implications for ore deposit formation

“…If the Au is in 1+ oxidation state, this can be achieved only if half of the charge of S 2À is balanced by another cation. We assumed for simplicity that this cation is H + , based on the known high affinity of Au to complex with hydrosulfide ligands in high P-T volatiles (Tossell, 1996;Gibert et al, 1998;Stefansson and Seward, 2004;Tagirov et al, 2005;Zezin et al, 2007;Pokrovski et al, 2009b;Zajacz et al, 2010). This is not unreasonable considering that there is 5.7 wt.% (17 mol%) water in the silicate melt (Table 4) and that at such high concentration, approximately 2/3 of it is present as molecular water (Stolper, 1982;Botcharnikov et al, 2006).…”

Solubility of Au in Cl- and S-bearing hydrous silicate melts

“…At the onset of heating, the fluid phase will be quickly distributed between the grains of solid glass powder. According to the experimental studies on Au solubility in magmatic and hydrothermal fluids (e.g., Zotov et al, 1991;Archibald et al, 2001;Frank et al, 2002;Seward, 2003a,b, 2004;Hanley et al, 2005;Simon et al, 2005Simon et al, , 2007Zezin et al, 2007;Pokrovski et al, 2009a,b), considerable amounts of Au can be dissolved in Cl-and S-bearing fluids already in early stages of the experiment, i.e., at relatively low temperatures during heating. Furthermore, the solubility of Au in the fluid phase increases with increasing temperature.…”