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Partitioning of Sr, Ba, Rb, Y, and LREE between alkali feldspar and peraluminous silicic magma

Department of Geology, Baylor University, Waco, Texas 76798, U.S.A.

Samples from well-known rhyolitic systems in the western USA were analyzed to determine trace-element partition coefficients between sanidine and coexisting melt. Both D_Sr and D_Eu correlate positively with An concentration in sanidine. Barium, not surprisingly, shows more correlation with Or in sanidine. All three show negative correlations with whole-rock Al₂O₃. Partition coefficients for REE show a decreasing trend with strong positive D_Eu. D_LREE correlate negatively with the whole-rock Al₂O₃. In peraluminous rocks, Al₂O₃ in magma seems to exert a major influence on partition coefficients of trace elements. With increasing Al₂O₃ concentration, the melt composition becomes increasingly similar to that of feldspar. Incompatible trace elements (Rb, Y, Nb, and Zr) in sanidine show positive trends whereas compatible trace elements (Sr, Eu, and Ba) show negative correlations when plotted against whole-rock Al₂O₃. LREEs, which are expected to substitute for Ca in the sanidine structure, behave like Sr and Eu. Because trace-element partitioning is influenced by both crystal and magma compositions, multiple regression analysis has been used to predict trace-element partition coefficients. The equations will assist workers in the selection of partition coefficients used in petrogenetic models of silicic systems.

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