Magmatic volatiles in explosive rhyolitic eruptions
Journal Article
·
· Geophys. Res. Lett.; (United States)
Obsidian clasts in rhyolitic tephra deposits preserve preeruption magmatic volatile contents, providing a direct means for determining the volatile content of explosively erupted magmas. Small to moderate volume Plinian eruptions (10/sup -3/ to 10/sup -1/ km/sup 3/) appear to be driven by 0.5--1.0 wt.% volatiles, consisting dominantly of H/sub 2/O with minor CO/sub 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/sub 2/O.
- Research Organization:
- Sandia National Laboratories, Albuquerque, NM 87185
- OSTI ID:
- 5476604
- Journal Information:
- Geophys. Res. Lett.; (United States), Vol. 8:7
- Country of Publication:
- United States
- Language:
- English
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