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Abstract
The solubilities of water in six melts in the system $$K_{2}O-Na_{2}O-Al_{2}O_{3}-SiO_{2}$$ were determined at 970-1630 bars and 800°C. Melts were synthesized hydrothermally in Pt capsules in cold-seal vessels and then quenched isobarically. The solubilities were determined by micromanometric measurement of $$H_{2}O$$ evolved during vacuum fusion of vesicle-free glass wafers and are reproducible to ±2.8% (2 s.d.) of the concentration. The solubilities at 970 bars for the granitic and phonolitic minimum melts are $$2.88 \pm 0.10$$ wt % and $$5.01 \pm 0.14$$ wt %, respectively. Both peralkaline and peraluminous granitic melts have higher $$H_{2}O$$ solubilities than the 1 kbar $$P(H_{2}O)$$ minimum melt and indicate the existence of minima in solubilities at molar (Na + K)/Al = 1 along joins of constant $$SiO_{2}$$. Two melts at constant $$SiO_{2}$$ and (Na + K)/Al ratio, but varying in Na/(Na + K) (0.57, 0.69 molar), have the same solubility ($$2.88 \pm 0.10, 2.74 \pm 0.10$$ wt %). The compositional depend...
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