Solubility of tin in (Cl, F)-bearing aqueous fluids at 700°C, 140MPa: A LA-ICP-MS study on synthetic fluid inclusions

Experimental study on tin partition between granitic silicate melt and coexisting aqueous fluid

“…is M). The valence of aqueous tin is +2 because of the oxygen fugacity near NNO in the experiments, just in consistency with the findings of Kovalenko et al (1986), Wilson and Eugster (1990) and Duc-Tin et al (2007), who concluded that SnCl 2 is the dominant tin-bearing complex in aqueous fluids at 700~800°C, 100~140 MPa and f O 2 near NNO. The alkali contents in the glasses from the experiments with HCl solution as starting fluid are similar to those of the starting melt when the HCl concentrations of starting fluid are less than 0.1 M. However, the alkali contents decrease drastically with increasing HCl concentrations in starting fluids when the [HCl] is above 1 M. According to Frank et al (2003), the contents of SiO 2 and Al 2 O 3 were not affected by the increased concentrations of HCl in the coexisting aqueous fluid, so high [HCl] concentrations in the aqueous fluid would lead to preferential removal of sodium and potassium from the melt relative to aluminum and the increase of ASI of the melt which would …”

“…So as the melt becomes more alkaline, the ASI of the melt will decrease and the HCl concentration of the aqueous vapor will decrease, which means that less Sn is complexed by Cl and the partition coefficient for Sn decreases. The peralkaline melts contain about twice as much tin than the peraluminous melts, demonstrating that a significant amount of tin can be transported by a highly peralkaline melt, which is in good agreement with predictions and the results of Duc-Tin et al (2007).…”

High Cu concentrations in vapor-type fluid inclusions: An artifact?

“…Fluid inclusions were synthesized with the etched quartz plate technique described in Duc-Tin et al (2007), using etched pieces of natural quartz from Brazil that were loaded together with fluid (H 2 O, NaCl ± KCl ± HCl ± FeCl 2 ± CuCl; doped with 200-500 ppm Rb, Cs, Co, and/or Pb), solid starting materials (e.g., elemental sulfur, Na 2 S, anhydrite, AgCl, As 2 O 3 , H 3 BO 3 , arsenopyrite, chalcocite, molybdenite), some SiO 2 glass plus buffer minerals (e.g., albite, orthoclase, biotite, muscovite, topaz, bornite, chalcopyrite, magnetite, pyrite) into Au capsules of 5.0 mm O.D., 4.6 mm I.D. and 40 mm length.…”

An experimental study of the solubility of molybdenum in H2O and KCl–H2O solutions from 500 °C to 800 °C, and 150 to 300 MPa

“…Equally, Hanley et al (2005) in a Pt solubility study evaluated inclusions from different zones within each capsule and compared experiments of different duration. Recently, Duc-Tin et al (2007) studied Sn solubility in necked-down inclusions in quartz in contact with cassiterite grains, thus eliminating any fluid contact with the capsule walls. They found that inclusions formed in this way produced identical results to those synthesized in the more conventional manner.…”