Abstract
Equations are developed which describe the increase with time of the 87Sr86Sr and 87Rb86Sr ratios and Sr concentration in the residual liquid during a magmatic fractional crystallization process.Although at present the changes in the initial 87Sr86Sr ratio can be disregarded in most cases, for magmas with high Rb/Sr ratios and/or sufficiently long crystallization time-spans these changes may become important.The equations derived may be used to calculate Rb and Sr bulk partition coefficients when applied to the evolution of high-Rb/Sr magmas by fractional crystallization.
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