Katy Chamberlain
Deep and disturbed: conditions for formation and eruption of a mingled rhyolite at Ascension Island, south Atlantic
Chamberlain, Katy; Barclay, Jenni; Preece, Katie; Brown, Richard; McIntosh, Iona; EIMF
Authors
Jenni Barclay
Katie Preece
Dr Richard Brown richard.brown3@durham.ac.uk
Associate Professor
Iona McIntosh
EIMF
Abstract
The generation of felsic melts (through open or closed system processes) within ocean island volcanoes has been a key area of study since their identification. At Ascension Island in the south Atlantic, explosively erupted felsic melts have, to date, demonstrated a marked absence of signs of magma mixing and crustal assimilation. Here we present the first observations of a fall deposit from Ascension Island recording both macro- and micro-scale evidence for magma mingling. Geochemical analyses of mineral and glass phases, coupled with volatile concentrations of melt inclusions highlight the role of lower-crustal partial melting to produce rhyolitic magmas. Glass textures and the lack of zoning in major mineral phases indicate that mingling with a mafic melt occurred shortly prior to eruption. These inferences of a deep rhyolite production zone, coupled with rapid ascent rates highlight the challenges in forecasting a similar style of eruption at Ascension Island in the future.
Citation
Chamberlain, K., Barclay, J., Preece, K., Brown, R., McIntosh, I., & EIMF. (2020). Deep and disturbed: conditions for formation and eruption of a mingled rhyolite at Ascension Island, south Atlantic. Volcanica, 3(1), 139-153. https://doi.org/10.30909/vol.03.01.139153
Journal Article Type | Article |
---|---|
Online Publication Date | May 5, 2020 |
Publication Date | 2020 |
Deposit Date | May 15, 2020 |
Publicly Available Date | May 15, 2020 |
Journal | Volcanica |
Electronic ISSN | 2610-3540 |
Publisher | Volcanica |
Peer Reviewed | Peer Reviewed |
Volume | 3 |
Issue | 1 |
Pages | 139-153 |
DOI | https://doi.org/10.30909/vol.03.01.139153 |
Public URL | https://durham-repository.worktribe.com/output/1270659 |
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© The Author(s) 2020. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use,distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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