Noble gas isotopes reveal degassing-derived eruptions at Deception Island (Antarctica): implications for the current high levels of volcanic activity

Deception Island is one of the most active volcanoes in Antarctica with more than twenty explosive eruptions in the past two centuries. Any future volcanic eruption(s) is a serious concern for scientists and tourists, will be detrimental to marine ecosystems and could have an impact to global oceano...

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Bibliographic Details
Published in:Scientific Reports
Main Authors: Álvarez-Valero, Antonio M, Sumino, Hirochika, Caracausi, Antonio, Sánchez, Antonio Polo, Burgess, Ray, Geyer, Adelina, Borrajo, Javier, Rodríguez, José A Lozano, Albert, Helena, Aulinas, Meritxell, Núñez-Guerrero, Elena
Other Authors: #PLACEHOLDER_PARENT_METADATA_VALUE#, Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia
Format: Article in Journal/Newspaper
Language:English
Published: Nature PG 2022
Subjects:
noble gases
Antartica
Deception Island
Antarc*
Antarctica
antartic*
Online Access:http://hdl.handle.net/2122/16039
https://doi.org/10.1038/s41598-022-23991-3
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Summary:Deception Island is one of the most active volcanoes in Antarctica with more than twenty explosive eruptions in the past two centuries. Any future volcanic eruption(s) is a serious concern for scientists and tourists, will be detrimental to marine ecosystems and could have an impact to global oceanographic processes. Currently, it is not possible to carry-out low and high frequency volcanic gas monitoring at Deception Island because of the arduous climatic conditions and its remote location. Helium, neon and argon isotopes measured in olivine samples of the main eruptive events (pre-, syn- and post caldera) offer insights into the processes governing its volcanic history. Our results show that: (i) ascending primitive magmas outgassed volatiles with a MORB-like helium isotopic signature (3He/4He ratio); and (ii) variations in the He isotope ratio, as well as intensive degassing evidenced by fractionated 4He/40Ar* values, occurred before the beginning of the main eruptive episodes. Our results show how the pre-eruptive noble gas signals of volcanic activity is an important step toward a better understanding of the magmatic dynamics and has the potential to improve eruption forecasting. Published 19557 5V. Processi eruttivi e post-eruttivi JCR Journal

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