Magmatic volatiles in explosive rhyolitic eruptions | Zendy

Eichelberger J. C. | Zendy; Westrich H. R. | Zendy

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Magmatic volatiles in explosive rhyolitic eruptions

Author(s) -

Eichelberger J. C.,

Westrich H. R.

Publication year - 1981

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl008i007p00757

Subject(s) - tephra , rhyolite , geology , magma , explosive eruption , geochemistry , volcano , magmatic water , melt inclusions , explosive material , petrology , mineralogy , volcanic rock , seismology , meteoric water , chemistry , hydrothermal circulation , organic chemistry

Obsidian clasts in rhyolitic tephra deposits preserve preemption magmatic volatile contents, providing a direct means for determining the volatile content of explosively erupted magmas. Small to moderate volume Plinian eruptions (10 −3 to 10 −1 km³) appear to be driven by 0.5‐1.0 wt.% volatiles, consisting dominantly of H 2 O with minor CO 2 . Analysis of obsidian from eruptive sequences consisting of tephra and flows indicates that this hydrous magma abruptly overlies magma with only 0.1‐0.2 wt.% H 2 O.

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