Publication Date:
2017-04-04
Description:
Strombolian and fire fountain activities represent a common expression of explosive
basaltic eruptions. However, the transition between these two eruptive styles and their
source mechanisms are still debated. We use textural and compositional studies to characterize
pyroclastic material from both the Strombolian and Hawaiian-style fire fountain
phases of the January–June 2000 Etna activity. We find that basaltic scoria presents
distinctive textural and compositional features that reflect different modes of magma vesiculation
and crystallization in the two eruptive regimes. Overall, magma that forms
Strombolian scoria is far more crystallized, less vesicular, and more evolved, indicating
strong volatile depletion and longer residence time before being erupted. Fire fountain
scoria indicates a fast-rising magma with evidence of moderate syneruptive volatile exsolution.
The new textural and compositional data set is integrated with previous volcanological
and geophysical investigations to provide further insights into the dynamics of
fire fountains, and to frame the transition from Strombolian explosions to fire fountain
activity into a model that may apply to future eruptions at Mount Etna as well as other
active basaltic volcanoes.
Description:
Published
Description:
201-204
Description:
reserved
Keywords:
Mt. Etna
;
explosive activity
;
scoria
;
textures
;
glass compositions
;
eruption dynamics
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
358707 bytes
Format:
application/pdf
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