6533b86dfe1ef96bd12c962a
RESEARCH PRODUCT
First study of the heat and gas budget for Sirung volcano, Indonesia
Ugan B. SaingPretina SitinjakV. I. TsanevAlessandro AiuppaAlessandro AiuppaPhilipon BaniClive OppenheimerHilma Alfiantisubject
010504 meteorology & atmospheric sciencesSulfideEarth science010502 geochemistry & geophysics01 natural sciencesHydrothermal circulationAtmosphereHeat loGeochemistry and PetrologyCrater lake[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/VolcanologySedimentology0105 earth and related environmental scienceschemistry.chemical_classificationgeographygeography.geographical_feature_categoryLead (sea ice)Heat lossHeat lossesSirung volcanochemistryVolcano[SDU]Sciences of the Universe [physics]Degassing budgetCrater lakeGeologydescription
International audience; 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 sub-craters 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-07-15 | Bulletin of Volcanology |