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The partitioning of strontium between anhydrite and mixtures of seawater with NaCl solutions has been studied experimentally. Anhydrite was precipitated by heating mixtures of seawater and NaCl solutions to temperatures between 150° and 250°C. It was found that the partition coefficient of Sr in this system depends less on the NaCl concentration, temperature, and precipitation rate than on the degree of supersaturation of the solutions with respect to anhydrite and/or the morphology of the precipitated anhydrite crystals. Acicular anhydrite was precipitated from solutions with a relatively high degree of supersaturation; rectangular anhydrite was precipitated from solutions with low degrees of supersaturation. The partition coefficient of Sr between solutions and rectangular anhydrite at 150°, 200°, and 250°C is 0.35 ± 0.05, 0.24 ± 0.05, and 0.27 ± 0.05, respectively.

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