Experimental metamorphism of NaCl-bearing aqueous solutions by reactions with silicates

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Abstract
The starting materials, illite, glauconite, montmorillonite, and muscovite, were allowed to react with salt-solutions at 1 kb and 350 degrees , 450 degrees , and 550 degrees C, respectively. Na (super +) was fixed in Na-bearing aluminosilicates and K (super +) , Fe (super 3+) , Ca (super 2+) , and Mg (super 2+) entered the fluid phase. The fluid phase became acid, and the amount of NaCl consumed by the reactions increased with increasing temperatures as well as with increasing ionic strength. The K (super +) /Na (super +) ratio of the fluid phase increased with increasing temperature at fixed ionic strength and decreased in isothermal runs with increasing ionic strength. The Fe (super 2+) /Na (super +) ratio increased both with increasing temperature and salt concentration. At higher temperatures and ionic strengths, Fe (super 2+) became the most concentrated cation in the solution next to Na (super +) .

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