Publication Date:
2017-04-04
Description:
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, d13CCO2 = 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.
Description:
Published
Description:
L21302
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
JCR Journal
Description:
reserved
Keywords:
helium
;
isotope
;
04. Solid Earth::04.08. Volcanology::04.08.01. Gases
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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