2024-03-28T20:44:42Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2140352021-05-06T14:37:22Zcom_10261_82com_10261_8col_10261_461
Álvarez-Valero, A. M.
Aulinas, M.
Geyer, Adelina
Gisbert, Guillem
Kereszturi, G.
Núñez-Guerrero, E.
Polo-Sánchez, A.
Sumino, H.
2020-06-10T11:25:37Z
2020-06-10T11:25:37Z
2020-05-04
http://hdl.handle.net/10261/214035
Geochemistry of volatiles in active volcanoes provides insights into the magmatic processes and
evolution at depth, such as magma evolution and degassing, which can be implemented into
volcanic hazards assessment. Deception Island is one of the most active volcanoes in Antarctica,
with more than twenty explosive eruptions documented over the past two centuries. Hydrogen
and oxygen isotopic variations in the volatiles trapped in the Deception Island rocks (glass and
melt inclusions in phenocrysts) provide essential information on the mechanisms controlling the
eruptive history in this volcanic suite. Thus, understanding the petrological and related isotopic
variations in the island, has the potential to foresee the possible occurrence and its main eruptive
features of a future eruption.
Information from hydrogen and oxygen stable isotopes combined with detailed petrologic data
reveal in Deception Island (i) fast ascent and quenching of most magmas, preserving pre-eruptive
magmatic signal of water contents and isotopic ratios, with local modification by rehydration due
to glass exposition to seawater, meteoric and fumarolic waters; (ii) a plumbing system(s) currently
dominated by closed-system degassing leading to explosive eruptions; (iii) control on the
interactions of ascending magmas with the surface waters producing hydrovolcanic activity
throughout the two main fault systems in Deception Island. These results can be considered in
further studies of volcanic monitoring to improve the capability to interpret geophysical data and
signals recorded during volcanic unrest episodes, and hence, forecast volcanic eruptions and
related hazards.
This research was partially funded by the following projects: POSVOLDEC (CTM2016¿79617¿P)
(AEI/FEDER¿UE), VOLGASDEC (PGC2018-095693-B-I00) (AEI/FEDER¿UE) and Programa Propio
Ib-2019 (USAL). This research is also part of POLARCSIC activities.
http://creativecommons.org/licenses/by/4.0
openAccess
Volcanology
Magma
Antarctica
Magma ascent and eruption forecasting at Deception Island volcano (Antarctica) evidenced by dD and d18O variations
póster de congreso