Abstract
If Sm and Nd are mobilized during fluid-rock interaction, fractionation of the ratio between Sm and Nd in geological units may take place. The fractionation can be characterized by a fractionation factor F, which can attain any value between D Sm /D Nd and 1 /( D Sm/D Nd ) depending on the fluid/rock ratio during REE transfer. If such fractionations are not recognized this will induce errors in Sm-Nd isotopic interpretations of age and provenance of the affected geological units. The apparent ages and ϵ Nd values are functions of the true values, F, and the time lapse between petrogenesis and secondary disturbance. The functional relationships can be closely approximated by direct proportionalities.
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