Effect of fO2 on tin speciation in H2O-NaCl-HCl fluids - Implication for formation of tin ore deposits

The aim of the proposed experiments is to provide new insights into cassiterite solubility and tin speciation in various hydrous supercritical fluids at pressures and temperatures relevant for formation of hydrothermal tin ore deposits using a hydrothermal autoclave and X-ray absorption spectroscopy. The experimental approach enables to determine cassiterite solubility in H2O-NaCl-HCl solutions and simultaneously establish the Sn(II)/Sn(IV) ratio in the fluid as function of oxygen fugacity at high temperatures and high pressures.