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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DOI: https://doi.org/10.1038/306541a0
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