Silicate melt solubilities

Blank J. G. and Brooker R. A. (1994) Experimental smdies of carbon dioxide in silicate melts solubility, speciation, and stable carbon isotope behavior. Rev. Mineral. 30, 157-186. 

Ripley EM, Brophy JG, Li C (2002) Copper solubility in a basaltic melt and sulfide liq-uid/silicate melt partition coefficients of Cu and Fe. Geochim Cosmochim Acta 66 2791-2800 Rosman KJR (1972) A survey of the isotopic and elemental abundances of zinc. Geochim Cosmochim Acta 36 801-819. 

Figure 9,15 Solubility of noble gases in silicate melts as a function of kinetic radius of gaseous molecule (A) and temperature (B). Ordinate axis in part A natural logarithm of Henry s constant in part B, natural logarithm of equilibrium constant. Reprinted from G. Lux, Geochimica et Cosmochimica Acta, 51, 1549-1560, copyright 1987, with kind permission from Elsevier Science Ltd., The Boulevard, Langford Lane, Kidlington 0X5 1GB, UK.

The solubility of noble gases in silicate melts obeys Henry s law but varies markedly with the chemistry and physical properties of the melt it increases with the... 

Figure 9J6 Effects of pressure on solubility of argon in silicate melts. From White et al. (1989). Reprinted with permission of The Mineralogical Society of America.

Table 9,9 Interpolation parameters giving solubility of Ar in silicate melts as a function of R Standard state of reference for gaseous phase is pure gas Ar at P = 15 kbar and T = 1600 °C. Concentration is adopted standard state for Ar in melt. is molar volume of Ar in melt,...

As described in chapter 6, the main factors determining the solubility of a given element in a silicate melt are the Lux-Flood acidity of its oxide and the relative proportions of the cations of different field strengths (cation charge over squared sum of cation plus ligand radii ZIA ) or charge densities (cation charge over ionic radius Z/r). 

The plot in figure 10.8 clearly shows that silicate melts may exert marked fractionation on REE acidic melts with relatively greater free oxygen activity display the highest mean activity coefficients in fight REE (TREE). LREE are thus less soluble in these melts than heavy REE (HREE). The opposite is observed in basic melts, which have the highest mean activity coefficients at the HREE level. In other words, REE relative concentrations in silicate melts simply reflect their relative solubilities, as we saw for crystal structures. 

Domine, F. Velde, B. 1986. Preliminary investigation of the process governing the solubility of uranium in silicate melts. Bulletin de Mineralogie, 108, 755-766. 

Figure 2.5 Correlation between argon solubility (in natural logarithm of the Henry s law constant) in silicate melts and various parameters NBO/Si (no bridging oxygen to silicon ratio), molar volume, ionic porosity, and density. Reproduced from Shibata et al. (1998).

The energy ( ,) to create a cavity can be approximately equated to 4 rr2cx, where cr represents the surface tensions between the fluid and a perfect rigid wall of the cavity and r denotes the radius of the cavity (e.g., Blander et al., 1959). Therefore, if the cavity creation is the dominant controlling factor in noble gas solubility, which is likely to be the case in common silicate melts, the Henry s law constant can be approximately given by... 

Figure 2.6 Temperature dependence of the Henry s law constants (K) for noble gas solubility in three silicate melts. Reproduced from Lux (1987).

There is now a large amount of noble gas diffusion data obtained for rocks or minerals. However, very few studies have been done on noble gas diffusion in silicate melts. The latter bears a central importance in understanding the noble gas evolution in the mantle. Figure 2.11 shows one such scarce example (Lux, 1987), where the diffusion coefficients obtained for a tholeiite basalt melt at 1350°C are plotted as a function of noble gas radius. Diffusion obeys more or less the same linear relationship with r as does the solubility. As Lux (1987) noted, it is remarkable that the... 

Most submarine volcanic rocks contain C02-filled vesicles (bubbles) in glassy margins. Because noble gases in silicate melts partition very effectively into a gas phase (i.e., their solubilities are low), it would be expected that noble gases in submarine volcanics would be found in the bubbles as will be discussed later, this seems indeed to be the case (e.g., Kurz Jenkins, 1981 Marty Ozima, 1986 Sarda Graham, 1990 Graham Sarda, 1991). The popping rocks, so-called because of... 

Carroll, M. R., Stolper, E. M. (1993) Noble gas solubility in silicate melts and glasses New experimental results for Ar and the relationship between solubility and ionic porosity. 

Chamorro-Perez, E., Gillet, P., Jambon, A. (1996) Argon solubility in silicate melts at very high pressures. Experimental set-up and preliminary results for silica and anorthite melts. 

Hayatsu, A., Waboso, C. E. (1985) The solubility of rare gases in silicate melts and implications for K-Ar dating. Chem. Geol., 52, 97-102. 

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