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Chamberlain, Katy Jane, Barclay, Jenni 
ORCID: https://orcid.org/0000-0002-6122-197X, Preece, Katie, Brown, Richard and McIntosh, Iona
(2020)
Deep and disturbed: conditions for formation and eruption of a mingled rhyolite at Ascension Island, south Atlantic.
Volcanica, 3 (1).
pp. 139-153.
ISSN 2610-3540
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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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ascension island,crustal melting,magma genesis,magma mingling,earth and planetary sciences (miscellaneous),geochemistry and petrology,geology,geophysics ,/dk/atira/pure/subjectarea/asjc/1900/1901 |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Geosciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 12 May 2020 23:59 |
| Last Modified: | 22 Oct 2022 06:09 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/75127 |
| DOI: | 10.30909/vol.03.01.139153 |
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