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Alteration processes in Deception Island volcano (Antarctica), a first step in the study of the current hydrothermal system

Urheber*innen

Vilanova-Pagès,  Oriol
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Geyer,  Adelina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Albert,  Helena
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Aulinas,  Meritxell
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Arasanz,  Raquel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Polo-Sánchez,  Antonio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ibañez-Insa,  Jordi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Álvarez-Valero,  Antonio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Prieto-Ballesteros,  Olga
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Vilanova-Pagès, O., Geyer, A., Albert, H., Aulinas, M., Arasanz, R., Polo-Sánchez, A., Ibañez-Insa, J., Álvarez-Valero, A., Prieto-Ballesteros, O. (2023): Alteration processes in Deception Island volcano (Antarctica), a first step in the study of the current hydrothermal system, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1061


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018155
Zusammenfassung
Progressive hydrothermal alteration and mineral precipitation can modify the physical properties and mechanical behavior of the affected rocks, increasing the probabilities of phreatic or hydrothermal explosive eruptions. In this work we focus on the study of rock alteration and hydrothermal system of Deception Island, which is one of the most active volcanoes in Antarctica. A characterization of the pre-caldera and syn-caldera rock alterations has been done as a starting point for the understanding of the past and present hydrothermal system in the island. The alteration processes that have affected pre-caldera deposits are related to low temperature (<200 oC) fluids, with pervasive palagonitisation and precipitation of smectite and zeolite. In some samples carbonate has also been detected. This alteration is consistent with rocks located at the first 500-600 meters depth of the pre-caldera shield volcano, in which the upper part of the sequence was affected by low-temperature acidic hydrothermal fluids that would have caused the dissolution of some phenocrysts and the consequent precipitation of magnesite. An extended palagonitisation characterize the syn-caldera deposits, but smectite and zeolite have also been identified. This is consistent with syn-depositional and meteoric alteration. Therefore, in the studied samples there is no evidence of persistent hydrothermal alteration that could be related to the current hydrothermal system. This work is part of the CSIC Interdisciplinary Thematic Platform (PTI) Polar zone Observatory (PTI-POLARCSIC) activities. This research was partially funded by the MINECO VOLCLIMA (CGL2015-72629-EXP) and HYDROCAL (PID2020-114876GB-I00) MCIN/AEI/10.13039/501100011033 research projects. This research is also supported by the PREDOCS-UB grant.