Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3223307c&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 23, CiteID L23307
Other
5
Volcanology: Subduction Zone Processes (1031, 3060, 3613, 8170), Volcanology: Intra-Plate Processes (1033, 3615), Volcanology: Explosive Volcanism, Volcanology: Magma Migration And Fragmentation, Volcanology: Tephrochronology (1145)
Scientific paper
We report on a subplinian eruption fed by a picritic magma that occurred 3930 +/- 60 BP at Etna volcano. The eruption produced a fallout deposit of 0.183 km3 (0.055 km3 DRE), widely dispersed eastward, which represents a marker bed for the Holocene stratigraphy of the volcano. Tephra have a composition of nearly primary magma, owing to their high Mg# (72-79). Glass geothermometry indicates eruptive temperatures (1159-1171°C) ~ 100° higher than those measured in recent eruptions. High volatile content and unusual enrichment of LIL elements in feeding magma, both suggest addition of fluids in the source zone accounting for a large production of highly buoyant fast-rising melt. Vigorous degassing of volatile-rich picritic magma is responsible for the explosive nature of this eruption.
Coltelli Mauro
Del Carlo Paola
Pompilio Massimo
Vezzoli Luigina
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