Geochemical variations of air-free crater fumaroles at Mt Etna: New inferences for forecasting shallow volcanic activity

Details Geochemical variations of air-free crater fumaroles at Mt Etna: New inferences for forecasting shallow volcanic activity Geochemical variations of air-free crater fumaroles at Mt Etna: New inferences for forecasting shallow volcanic activity

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3521302m&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 21, CiteID L21302

Physics

2

Volcanology: Volcanic Gases, Volcanology: Volcano Monitoring (7280), Volcanology: Effusive Volcanism, Geochemistry: Radiogenic Isotope Geochemistry, Geochemistry: Stable Isotope Geochemistry (0454, 4870)

Scientific paper

We investigated the gas geochemistry of fumaroles close to the Voragine crater of Mt Etna that have a temperature of 90-95°C, are CO2-dominated, and have an air content as low as <1%. This is the first report of the monitoring of such air-free fumaroles at the Etnean crater area-previous studies indicated an air contribution of 70% or more. The helium and carbon isotopes (Rc/Ra = 6.5 +/- 0.4, δ 13CCO2 = -1.7 +/- 0.5‰) suggest that the released gas is directly related to the magmatic degassing. The fumaroles were sampled 12 times between June 2007 and June 2008, which revealed an increase in Rc/Ra from 6.1 to 6.9 that can be related to the increasing volcanic activity at the summit area of Mt Etna. These fumaroles offer a new tool for detecting magmatic processes (magma ascent, refilling, degassing, etc.), and will be useful for volcano surveillance.

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