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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 SiO 2 . agpaitic index, and whole-rock Na 2 O/K 2 O. Other DREE can be calculated given whole-rock SiO 2 , agpaitic index, and whole-rock CaO. These D-values all increase with increasing whole-rock SiO 2  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

american mineralogist

Trace-element partitioning between alkali feldspar and peralkalic quartz trachyte to rhyolite magma. Part II: Empirical equations for calculating trace-element partition coefficients of large-ion lithophile, high field-strength, and rare-earth elements