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

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    Authors
    Chamberlain, Katy J.
    Barclay, Jenni
    Preece, Katie
    Brown, Richard J.
    McIntosh, Iona
    EIMF
    Affiliation
    University of Derby
    University of East Anglia
    Swansea University
    Durham University
    JAMSTEC
    University of Edinburgh
    Issue Date
    2020-05-05
    
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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.
    Citation
    Chamberlain, K. (2020). 'Deep and disturbed: conditions for formation and eruption of a mingled rhyolite at Ascension Island, south Atlantic'. Volcanica, 3(1), pp. 139 – 153
    Publisher
    Presses universitaires de Strasbourg
    Journal
    Volcanica
    URI
    http://hdl.handle.net/10545/624811
    DOI
    10.30909/vol.03.01.139153
    Additional Links
    https://www.jvolcanica.org/ojs/index.php/volcanica/index
    http://www.jvolcanica.org/ojs/index.php/volcanica/article/view/59
    Type
    Article
    Dataset
    Language
    en
    EISSN
    2610-3540
    ae974a485f413a2113503eed53cd6c53
    10.30909/vol.03.01.139153
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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