Deep and disturbed: conditions for formation and eruption of a mingled rhyolite at Ascension Island, south Atlantic

Journal article


Chamberlain, Katy J., Barclay, Jenni, Preece, Katie, Brown, Richard J., McIntosh, Iona and EIMF 2020. Deep and disturbed: conditions for formation and eruption of a mingled rhyolite at Ascension Island, south Atlantic. Volcanica. https://doi.org/10.30909/vol.03.01.139153
AuthorsChamberlain, Katy J., Barclay, Jenni, Preece, Katie, Brown, Richard J., McIntosh, Iona and 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.

KeywordsMagma mingling; Ascension Island; Crustal melting; Magma genesis
Year2020
JournalVolcanica
PublisherPresses universitaires de Strasbourg
ISSN2610-3540
Digital Object Identifier (DOI)https://doi.org/10.30909/vol.03.01.139153
Web address (URL)http://hdl.handle.net/10545/624811
hdl:10545/624811
Publication dates05 May 2020
Publication process dates
Deposited22 May 2020, 16:02
Accepted17 Mar 2020
ContributorsUniversity of Derby, University of East Anglia, Swansea University, Durham University, JAMSTEC and University of Edinburgh
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