Other
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3693b&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 19, p. 3693-3696
Other
7
Volcanology: Hydrothermal Systems, Volcanology: Eruption Mechanisms
Scientific paper
Mineralogical, microtextural and geochemical studies have been performed on altered volcanic products from active hydrothermal areas, on phreatic tephra from the 1995 activity and on fragments from older Castle Peak dome and the present (1995-97) dome. The mineral assemblages of the hydrothermal system (primarily silica-polymorphs) are typical of the upper alteration zone of a high sulfidation system. Volatile and mobile elements chemistry show no evidence of interaction between the hydrothermal system and erupting magmas. These results suggest that the on-going eruption conduits are isolated from the hydrothermal system due to precipitation of vapor transported silica which drastically reduces the magma degassing through country rocks.
Boudon Georges
Ildefonse Philippe
Komorowski Jean-Christophe
Semet Michel P.
Villemant Benoi‸t.
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