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