Abstract
The solubility of natural strontianite has been measured at 50, 100 and 200°C in aqueous solutions in equilibrium with a vapor phase containing CO 2 at pressures between 1 and 50 atm. At each temperature the strontium concentration in solution was found to be proportional to the cube root of the fugacity of CO 2 in the vapor phase and inversely proportional to the moan activity coefficient of Sr(HCO 3) 2 in the solution. The solubility of strontianite was found to decrease with increasing temperature; however, the rate of decrease of the solubility is sufficiently smaller than that of calcite, so that at temperatures above 170°C the solubility of strontianite exceeds that of calcite. Our data show that the precipitation of strontianite can take place only when the ratio m Sr +2 m Ca +2 in solution is well in excess of the normal range of this ratio in natural waters, and that the precipitation of strontianite in geologic settings is more unlikely at high than at low temperatures. The high value of the ratio m Sr +2 m Ca +2 required for the deposition of strontianite can be obtained by preferential solution of celestite or barite or as a result of the recrystallization of high-strontium aragonito to low-strontium calcite.
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