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Deep sea explosive eruptions may be not so different from subaerial eruptions
Authors
Harald Behrens
Gianluca Iezzi
+7 more
Gabriele Lanzafame
Lucia Mancini
Salvatore Passara
Patrizio Signanini
Stella Tamburrino
Mattia Vallefuoca
Guido Ventura
Publication date
1 January 2020
Publisher
[London] : Macmillan Publishers Limited, part of Springer Nature
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Abstract
The dynamics of deep sea explosive eruptions, the dispersion of the pyroclasts, and how submarine eruptions differ from the subaerial ones are still poorly known due to the limited access to sea environments. Here, we analyze two ash layers representative of the proximal and distal deposits of two submarine eruptions from a 500 to 800 m deep cones of the Marsili Seamount (Italy). Fall deposits occur at a distance of more than 1.5 km from the vent, while volcanoclastic flows are close to the flanks of the cone. Ash shows textures indicative of poor magma-water interaction and a gas-rich environment. X-ray microtomography data on ash morphology and bubbles, along with gas solubility and ash dispersion models suggest 200–400 m high eruptive columns and a sea current velocity <5 cm/s. In deep sea environments, Strombolian-like eruptions are similar to the subaerial ones provided that a gas cloud occurs around the vent. © 2020, The Author(s)
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Last time updated on 11/08/2021
Institutionelles Repositorium der Leibniz Universität Hannover
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Last time updated on 24/06/2021