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- W324298023 abstract "The effect of NaCl aqueous solutions on the rates of isotopic exchange and fractionation factors between minerals and fluids has been evaluated at elevated temperatures using the available experimental data. Rates of oxygen isotopic exchange are significantly increased by interaction of a solid with NaCl solutions. The durations required to attain 90% isotopic exchange in the granite-fluid system have been calculated using a modified surface-exchange rate model (Cole et al., 1983). These calculations indicate that granite-pure water interaction required approximately 3700 years to reach 90% exchange, but only 74 years for reaction with 0.5m NaCl at 200{degree}C (grain radius = 0.1 cm, (W/R){sub mass} = 1). Isotopic fractionation factors between minerals and aqueous NaCl solutions can differ significantly form the mineral-pure water values. The salt effect can be as large as 2 to 3.5 permil for oxygen and 12 permil for hydrogen at temperatures above 150{degree}C. If ignored, the salt effect associated with 4m NaCl solution can lead to maximum error in geothermometer estimates for oxygen of 35{degree}C in the quartz-fluid system. The magnitude of these salinity effects is far too great to be ignored, and must be accounted for when modeling isotopic exchange in hydrothermal systems. 25 refs., 5more » figs., 5 tabs.« less" @default.
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- W324298023 date "1989-01-01" @default.
- W324298023 modified "2023-09-23" @default.
- W324298023 title "Influence of NaCl aqueous solutions on isotopic equilibria and rates of exchange in mineral-fluid systems" @default.
- W324298023 hasPublicationYear "1989" @default.
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