Solubility of Quartz under Hydrothermal Conditions

It is impossible to review the extensive investigations in this highly specialized Held. Some of the publications are as follows. [Pg.32]

Kennedy and associates developed data against which subsequent work was often compared (25, 130, 131). In 1954, extensive studies were made by Wyart and Sabatier (132), who measured the solubility of quartz, tridymite, cristobalite, and vitreous silica in both water and steam phases at up to 480 bars and 470 C. Increased solubility of quartz with pressure had earlier been examined up to 600 C by Morey (133), and more recently by Heitmann (30) Anderson and Burnham (134) examined solubility in water and salt and alkali solutions up to 900 C and 6 kilo-bars. Solubility was only slightly reduced by the presence of salt, but increased in direct proportion to the base added. The solubility of quartz under hydrothermal conditions is described in three papers by Kitahara (135) with special attention to supercritical conditions up to 500°C and 900 bars. The heat of solution of quartz calculated from solubility data was 7.8 kcal moIe. In 1965, Heitmann (30) surveyed the solubility of silica in water and stream and assembled data based on more than 1000 experiments up to 650 C and 300 kg cm on the basis of which a complete solubility diagram was constructed. Verifying earlier work, the solubility of silica is shown to increase with increasing density of steam or water, and reach a maximum near the critical point of water. The thermodynamic properties and solubility of quartz up to 600°C and 5 kilobars pressure are being summarized by Hegel-son(136). [Pg.32]

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