Abstract
The saturation surface of cassiterite, SnO2, was determined for liquids in the system K2O–Al2O3–SiO2 as a function of bulk composition and temperature. At fixed K2O/Al2O3 cassiterite solubility varies weakly with SiO2 concentration (76 to 84 mol%), temperature (1350° to 1550°C), and log (fO2) (−0.7 to −5.3). Cassiterite solubility is also approximately independent of composition in liquids with molar ratios of K2O/Al2O3 lessthan equal to 1 (peraluminous liquids). As K2O/Al2O3 increases from 1 (peralkaline liquids), however, cassiterite solubility increases steeply and approximately linearly with K2O in excess of Al2O3. It is proposed that potassium in excess of aluminum combines with Sn4+ to form quasi-molecular complexes with an effective stoichiometry of K4SnO4.
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