作者
Oriol Vilanova-Pagès, Adelina Geyer, Helena Albert, Meritxell Aulinas, Raquel Arasanz, Antonio Polo-Sánchez, Jordi Ibañez-Insa, Antonio Álvarez-Valero, Olga Prieto-Ballesteros
发表日期
2023
研讨会论文
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
出版商
GFZ German Research Centre for Geosciences
简介
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 …
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O Vilanova-Pagès, A Geyer, H Albert, M Aulinas… - XXVIII General Assembly of the International Union of …, 2023