Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour

Jones, Thomas J ORCID: 0000-0003-4981-5131, Le Moigne, Yannick, Russell, James K, Williams-Jones, Glyn, Giordano, Daniele and Dingwell, Donald B (2022) Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour. NATURE COMMUNICATIONS, 13 (1). 2832-.

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Abstract

During explosive eruption of low viscosity magmas, pyroclasts are cooled predominantly by forced convection. Depending on the cooling efficiency relative to other timescales, a spectrum of deposits can be formed. Deposition of hot clasts, above their glass transition temperature, can form spatter mounds, ramparts and clastogenic lava flows. Clasts may also be deposited cold, producing tephra cones and blankets. Thus, the deposit and pyroclast type can provide information about eruption dynamics and magma properties. Here we examine pyroclasts from Tseax volcano, British Columbia, Canada. These newly identified inflated pyroclasts, are fluidal in form, have undergone post-depositional expansion, and are found juxtaposed with scoria. Detailed field, chemical and textural observations, coupled with high temperature rheometry and thermal modelling, reveal that abrupt transitions in eruptive behaviour - from lava fountaining to low-energy bubble bursts - created these pyroclastic deposits. These findings should help identify transitions in eruptive behaviour at other mafic volcanoes worldwide.

Item Type:	Article
Uncontrolled Keywords:	Disasters, British Columbia, Cold Temperature
Divisions:	Faculty of Science and Engineering > School of Environmental Sciences
Depositing User:	Symplectic Admin
Date Deposited:	23 May 2022 08:55
Last Modified:	18 Jan 2023 21:01
DOI:	10.1038/s41467-022-30501-6
Open Access URL:	https://doi.org/10.1038/s41467-022-30501-6
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3155329