Abstract
Multivariate linear regression (MLR) analysis has been used to develop equations for predicting alkali feldspar/melt trace-element partition coefficients ( D -values) for certain large-ion lithophile elements (Rb and Eu), high field-strength elements (Zr and Nb), and rare-earth elements (Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Er, and Yb) in peralkalic felsic systems. A partitioning equation for Sr based solely on data from Pantelleria is also presented. D Rb, D Zr, and D Nb each can be calculated given whole-rock SiO2 and agpaitic index [A.I. = mol (Na + K) /Al]; alternatively, D Rb can be calculated given feldspar Or content and agpaitic index. D Eu can be calculated given whole-rock SiO2. agpaitic index, and whole-rock Na2O/K2O. Other D REE can be calculated given whole-rock SiO2, agpaitic index, and whole-rock CaO. These D -values all increase with increasing whole-rock SiO2 and decreasing agpaitic index. D Sr for samples from Pantelleria increase with increasing feldspar Ab and can be calculated given feldspar Ab content. The equations formulated will help to constrain better the choice of D -values used in petrogenetic models of peralkalic systems.
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