Albert, H.

Aulinas, M.

Borrajo, J.

Burgess, R.

Caracausi, A.

Geyer, A.

Lozano Rodríguez, José Antonio

Núñez-Guerrero, E.

Polo Sánchez, A.

Sumino, H.

Álvarez-Valero, A.M.

Digital.CSIC

 DI-18 DI-67 DI-68     PRR10298 DI-30DI-35DI-36Post-calderavarious formations3He/4He (Ra)         Ol (magma degassing)6.7-8.7 8.65.1-7.06.3-7.0*bubbling (fractionation)Post-caldera depositsSyn-caldera depositsPre-caldera depositsSedimentsPresentCaldera collapse stageOuter Coast Tuff formationPre-caldera stageBasaltic shield formationDI-337.1-7.5**Degassing-derived eruptions at Deception Island (Antarctica): geochemistry of noble gas isotopes with implications for volcano forecastingCPort FosterEasting, UTM 20S WGS 84 (m)Northing, UTM 20S WGS 84 (m)NeptunesBellowsBA SCNNorthScotia RidgeSFZHFZANTARCTICPLATESOUTH SCOTIAPLATESSTAPFORMERPHOENIXPLATEBSScotia SeaSAa)b) -60º- 55º -55º- 60º- 70º - 50º- 50ºFracture zoneTranscurrent faultSubduction zoneActive extensional zoneDeception Island- 70ºASCBArgentinian BaseSpanish BaseAbandoned Chilean BaseAbandoned British BaseInfrastructures19691825-18291967 19701829-19081829-19561842Historic volcanic vents-50 m-100 m-150 mWhalersBayc)DI-30DI-33DI-35DI-36PRR10298DI-67DI-68DI-18SOUTH SHETLANDMICROPLATE BPThis research was partially funded by the POSVOLDEC (CTM2016-79617-P) (AEI/FEDER-UE), VOLGASDEC (PGC2018-095693-B-I00) (AEI/FEDER-UE), HYDROCAL (PID2020-114876GB-I00)(MCIN/AEI/10.13039/501100011033) and EruptING (PID2021-127189OB-I00)( MCIN/AEI/ 10.13039/501100011033/FEDER,UE) projects, the JSPS Invitation Fellowship (S18113) at the University of Tokyo, and the PhD grant “Programa Propio III Universidad de Salamanca co-funded by Banco de Santander”. This research is also part of POLARCSIC activities.Álvarez-Valero, A.M., Sumino, H., Caracausi, A., Polo Sánchez, A., Burgess, R., Geyer, A., Borrajo, J., Lozano Rodríguez, J.A., Albert, H., Aulinas, M., Núñez-Guerrero, E., 2022. Noble gas isotopes reveal degassing-derivederuptions at Deception Island (Antarctica): implications for the current high levels of volcanic activity. Scientific Reports, 12, 19557.Antonio M. Álvarez-Valero 1*, Hirochika Sumino 2, Antonio Caracausi 1,3, Antonio Polo Sánchez 1, Ray Burgess 4, Adelina Geyer 5, Javier Borrajo 6, José A. Lozano Rodríguez 7, Helena Albert 8, Meritxell Aulinas 8, Elena Núñez-Guerrero 11. Departamento de Geología, Universidad de Salamanca, Spain (aav@usal.es);  2. Research Center for Advanced Science and Technology, University of Tokyo, Japan;3. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Italy;    4. Department of Earth and Environmental Sciences, University of Manchester, UK;5. Geosciences Barcelona, CSIC, Barcelona, Spain;    6. Departamento de Física, Ingeniería y Radiología Médica, Universidad de Salamanca, Spain; 7. Instituto Español de Oceanografía, C. O. Canarias, Spain.    8. Departamento de Mineralogía, Petrología y Geología Aplicada, Universidad de Barcelona, Spain. Deception Island is one of the most active volcanoes in Antarctica with morethan twenty explosive eruptions in the past two centuries and characterised bythree main episodes: pre-, syn- and post-caldera. The magmatic history of thisvolcano has been widely studied from the petrologic and geochemicalperspectives (Geyer et al. 2019; Sci.Rep). We combined this information withthe analysis of helium, neon and argon isotopes measured in inclusions hostedin olivine samples thus offering insights into the processes governing itsvolcanic history. Our results show that: (i) ascending primitive magmasoutgassed volatiles with a MORB-like 3He/4He isotopic signature; and (ii)variations in the helium isotope ratio, as well as intensive degassing evidencedby fractionated 4He/40Ar* values, occurred before the beginning of the maineruptive episodes.At Deception Island, an upcoming volcanic eruption is a serious concern for scientists andtourists, a detriment to marine ecosystems and could have an impact to global oceanographicprocesses. Yet it is not possible nowadays to carry-out low and high frequency volcanic gasmonitoring because of the hard climatic conditions and its remote location.Our research on the pre-eruptive signals of the volcanic activity at Deception Island contributes to a better understanding of the magmatic dynamics with the potential to improve eruption forecasting. Summary-sketch evolution of the He isotopic ratios along the volcanichistory of Deception Island (*: Kusakabe et al. 2009 Ant.Sci.;**:Padrón et al. 2015, Geology)(a) Simplified regional tectonic map and location of the South Shetland Islands,and orthophoto map (b); (c) Example of a recent abandoned scientific base aftera post-caldera eruption.

Degassing-derived eruptions at Deception Island (Antarctica): geochemistry of noble gas isotopes with implications for volcano forecasting

https://digital.csic.es/bitstream/10261/304692/1/Alvare-Valero%20et%20al.%2c%202023.pdf

Degassing-derived eruptions at Deception Island (Antarctica): geochemistry of noble gas isotopes with implications for volcano forecasting

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