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Unusual fluidal behavior of a silicic magma during fragmentation in a deep subaqueous eruption, Havre volcano, southwestern Pacific Ocean

Citation

Murch, AP and White, JDL and Carey, RJ, Unusual fluidal behavior of a silicic magma during fragmentation in a deep subaqueous eruption, Havre volcano, southwestern Pacific Ocean, Geology pp. 1-4. ISSN 0091-7613 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Geological Society of America

DOI: doi:10.1130/G45657.1

Abstract

Magma responds to applied stresses in either a viscous or elastic manner, depending on the time scales over which strain is accommodated. For silicic magmas, high strain rates of explosive volcanism cause brittle fragmentation and produce abundant small particles (ash). The A.D. 2012 Havre (Kermadec arc, southwestern Pacific Ocean) eruption at ∼900 m water depth deposited a unit of silicic ash with features indicative of syn- and/or post-fragmentation viscous deformation. Viscously deformed ash makes up 3%-35% of the two main ash subunits, S1 and S2, with the remaining ash formed by brittle fragmentation. Viscous behavior of melt during production of fine ash is unexpected for the silicic Havre magma, and for the high strain rates typical of fine fragmentation. The occurrence together of viscous and brittle ash grains suggests local and/or short-term variations in eruption conditions. We infer an explosive eruption mechanism modified by magma-water interaction, during which multi-source steam-veiled fragmentation sites permitted rapid viscous deformation of ash prior to contact with water.

Item Details

Item Type:Refereed Article
Keywords:submarine eruption, volcano, marine
Research Division:Earth Sciences
Research Group:Geology
Research Field:Volcanology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Carey, RJ (Dr Rebecca Carey)
ID Code:131784
Year Published:2019
Funding Support:Australian Research Council (DE150101190)
Web of Science® Times Cited:1
Deposited By:Earth Sciences
Deposited On:2019-04-04
Last Modified:2019-05-01
Downloads:0

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