Calculation of Quartz Precipitation from Hydrothermal Solution by Mixing
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概要
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A model calculation of quartz precipitation from hydrothermal solution by mixing is performed. This model considers that a high-salinity and high-temperature solution mixes with a low-salinity and low-temperature solution at the constant pressure (1000 bars or 500 bars) or vapor-liquid equilibrium pressures. The temperature of the high-salinity solution is assigned to be 600°C (at 1000 bars), 450°C (at 500 bars), or 300°C (at vapor-saturation). The low-salinity solution is 200°C at the three pressure conditions. The salinity of the high-temperature solutions is 20 or 10 NaCl wt%, and that of the low-temperature solution is 1 NaCl wt%. Both temperature and NaCl concentration of the mixed solution are lowered by stepwise increase in the weight fraction of the low-salinity and low-temperature solution.<BR>Calculations indicate that the amounts of precipitated quartz show the bell-shaped patterns against the temperature of the mixed solution. The model calculation is then applied to the cooling-and dilution-path of the hydrothermal solution for the Fujigatani-Kiwada deposits. By converting the solution temperature into the homogenization temperature, the quartz precipitation curve is recast onto the relation between homogenization temperature (and salinity) and the precipitated amount. The calculated results show the bell-shaped patterns observed for the frequency diagrams of homogenization temperatures and salinities of fluid inclusions.
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