Publication Date:
2022-06-08
Description:
With at least four eruptions over the last 20 years,
Sirung is currently one of the more active volcanoes in
Indonesia. However, due to its remoteness, very little is
known about the volcano and its hyperacid crater lake. We
report here on the first measurements of gas and heat emissions
from the volcano. Notable is the substantial heat loss
from the crater lake surface, amounting to 220 MW. In addition,
~17 Gg of SO2, representing 0.8% of Indonesian volcanic
SO2 contribution into the atmosphere, ~11 Gg of H2S,
~17 Gg of CO2, and ~550 Gg of H2O are discharged into
the atmosphere from the volcano annually. The volatiles
degassed from Sirung magmas are subjected to hydrothermal
fluid-rock interactions and sulfide depositions, initiated by the
disproportionation of SO2. These processes lead to distinct gas
compositions and changing lake water chemistry (in the subcraters
and the main crater lake). However, the occurrence of
SO2-rich fluids and strong gas flux appear to highlight a rapid
fluid transfer to surface, avoiding re-equilibration with lower
temperature rocks/fluids in the conduits.
Description:
Published
Description:
60
Description:
3V. Proprietà dei magmi e dei prodotti vulcanici
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
