Reference Database (ERR)
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Detailed Reference Information
Sisson 1994
Sisson, T.W. (1994). Hornblende-Melt Trace-Element Partitioning Measured by Ion Microprobe. Chemical Geology 117(1-4): 331-344. doi: 10.1016/0009-2541(94)90135-X.
Trace-element abundances were measured in situ by ion microprobe in five samples of hornblende and melt ranging from basaltic andesite to high-silica rhyolite. Except for one sample, for which quench overgrowth or disequilibrium is suspected, the abundance ratios show systematic inter-element and inter-sample variations, and probably approach true partition coefficients. Apparent partition coefficients are reported for La, Ce, Nd, Sm, Dy, Er, Yb, Sc, Ti, V, Cr, Sr, Y and Zr. Rare-earth elements (REE) and Y form smooth convex-upward partitioning patterns that rise to higher D-values and become increasingly convex in more evolved samples. Apparent partition coefficients for REE, Y, Ti, V and Cr can be parametrized as functions of the distribution of Ca between hornblende and melt, giving expressions to predict hornblende-melt trace-element partitioning values. These expressions are used to show that heavy REE-enriched hornblende/whole-rock REE abundance patterns in granitoids may result from partial re-equilibrium of hornblende and late-stage residual liquids rather than from anomalous partitioning values.

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Sample Techniques

central sierra-nevada, rare-earth elements, intrusive suite, coefficients, california, magma, differentiation, phenocrysts, liquids, genesis
Chemical Geology
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