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Sisson 1991

Sisson, T.W. (1991). Pyroxene-High Silica Rhyolite Trace-Element Partition-Coefficients Measured by Ion Microprobe. Geochimica et Cosmochimica Acta 55(6): 1,575-1,585. doi: 10.1016/0016-7037(91)90129-S.

Pyroxene-liquid trace element partition coefficients have been measured in situ by ion microprobe in high silica rhyolites. Partition coefficients are reported for La, Ce, Nd, Sm, Dy, Er, Yb, Sc, Ti, V, Cr, Sr, Y, and Zr. The in situ analyses avoid the problem of contamination of the pyroxene phase by trace element-rich accessory mineral inclusions encountered in traditional bulk phenocryst-glass partitioning studies. Pyroxenes and glasses which have been analyzed are typical of high silica rhyolites worldwide. The samples analyzed are Bishop Tuff, California (augite, hypersthene); Sierra la Primavera, Mexico (ferrohedenbergite); and two samples of the Huckleberry Ridge Tuff, Wyoming (ferroaugite). Rare earth element (REE) partition coefficient patterns are convex-upward and resemble patterns determined in less silicic bulk compositions. Partition coefficients for the REEs Sr, Zr, and Cr show correlations with the Mg

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	Analytical Techniques

Keywords
rare-earth elements, liquid, phenocrysts, clinopyroxene, probe, geochemistry, saturation, diopside, atlantic, basalts

Journal
Geochimica et Cosmochimica Acta
http://www.elsevier.com/wps/product/cws_home/212

Publisher
Elsevier Science
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