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Recharge in Volcanic Systems: Evidence from Isotope Profiles of Phenocrysts

Jon P. Davidson and Frank J. Tepley III
Science
New Series, Vol. 275, No. 5301 (Feb. 7, 1997), pp. 826-829
Stable URL: http://www.jstor.org/stable/2891649
Page Count: 4
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Recharge in Volcanic Systems: Evidence from Isotope Profiles of Phenocrysts
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Abstract

Strontium isotope ratios measured from core to rim across plagioclase feldspar crystals can be used to monitor changes in the isotope composition of the magma from which they grew. In samples from three magma systems from convergent margin volcanoes, sudden changes in major element composition, petrographic features, and strontium isotope composition were found to correspond to discrete magmatic events, most likely repeated recharge of more mafic magma with lower ratios of strontium-87 to strontium-86 into a crustally contaminated magma.

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