Metals in Hydrothermal Fluids
The recognition that some present day geothermal systems may be active analogs of metal- depositing hydrothermal systems of the past has promoted a great deal of interest in metal transport and deposition in present day systems (White, 1981; Weissberg; et al., 1979; Henley and Ellis, 1983). Relatively few thermodynamic data are available from which to calculate the high temperature solubilities for metals and metal sulphides. The calculations discussed below focus on recent experimental data up to about 350°C and on metal transport in geothermal and analogous epithermal environments. In Chapter 14 similar calculation procedures are used to examine metal deposition in some other ore-forming environments. Studies of high temperature metal complexing may ultimately become significant in geothermal corrosion and scale control, mineral recovery from brines and development of chemical processes for the control of toxic metals.