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Hydrogen isotopic evidence of rhyolitic magma degassing during shallow intrusion and eruption

Abstract

Deuterium and water contents of rhyolite obsidian tephra clasts and lava flows sampled in the western USA decrease within each eruptive sequence, from D- and H2O-rich, explosive (Plinian) eruptions, to D- and H2O-depleted lava flows. These changes result not from volatile gradients in the magma, but rather from progressive in situ degassing; involvement of meteoric water is excluded.

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Taylor, B., Eichelberger, J. & Westrich, H. Hydrogen isotopic evidence of rhyolitic magma degassing during shallow intrusion and eruption. Nature 306, 541–545 (1983). https://doi.org/10.1038/306541a0

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