Abstract
operative throughout the 200 ky history of the El Chichon magma Consistent core-to-rim decreases of Sr/Sr ratios and coincident system. increases in Sr concentrations in plagioclase phenocrysts of varying size (>1 cm to 2 mm) are reported from samples of the 1982 and pre-1982 (>200 ka) eruptions of El Chichon Volcano. Maximum Sr/Sr ratios of >0·7054, significantly higher than the wholerock isotopic ratios (>0·7040–0·7045), are found in the cores
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