Abstract
Solubility products of minerals in terms of molality of the metal (i.e., total molality of the metal ion) and stoichiometric solubilities of them expressed as amount of mineral (moles and grams) dissolved in 1000 grams of water for some oxide, hydroxide and silicate minerals were calculated using thermodynamic data at elevated temperatures and at various pH, PO2, PCO2 and mC1.coefficient of each species was assumed to be unity for the calculation. The solubility products, “solubility products” in this paper, and the stoichiometric solubilities of minerals in hydrothermal systems can be used for interpreting formation of gangue minerals in veins and hydrothermal alteration of rocks. Quartz veins are distributed widely and amounts of quartz in pottery stones are usually larger than the original rocks. Such field occurrences are attributed to the result that the “solubility product” and the stoichiometric solubility of quartz increase with temperature, while those of silicates usually decrease. Amounts of solution which flowed through a vein are estimated from those of gangue minerals, if temperature, pH etc. are known. The pattern of water flow in a geothermal area is suggested by the compositional change of rocks.
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