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    Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano

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    Authors
    Conway, Chris
    Chamberlain, Katy J.
    Harigane, Yumiko
    Morgan, Daniel
    Wilson, Colin
    Affiliation
    Research Institute of Earthquake and Volcano Geology, Japan
    National Museum of Nature and Science, Japan
    University of Derby
    University of Leeds
    Victoria University of Wellington
    Issue Date
    2020-06-25
    
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    Abstract
    Studies of pre-eruptive processes at active volcanoes require precise petrochronological constraints if they are to contribute to hazard assessment during future eruption events. We present petrological and geochemical data, and orthopyroxene diffusion timescales for samples from late Pleistocene high-Mg andesite dacite lavas (Mg#53–69) at Ruapehu volcano, New Zealand, as a case study of rapid magma genesis and eruption at a continental arc stratovolcano. Assembly of Ruapehu high-Mg magmas involved the mixing of primitive magmas plus entrained mantle equilibrated olivines with mid-crustal felsic mush bodies, yielding hybridized magmas with ubiquitous pyroxene reverse-zoning patterns. Orthopyroxene Fe-Mg interdiffusion timescales linked to quantitative crystal orientation data show that most lavas erupted <10 days after resumption of crystal growth following magma mixing events. The eruption of lavas within days of mixing events implies that pre-eruptive warnings may be correspondingly short.
    Citation
    Chamberlain, K. (2020). 'Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano'. Geology, pp. 1-5.
    Publisher
    The Geological Society of America
    Journal
    Geology
    URI
    http://hdl.handle.net/10545/624941
    DOI
    10.1130/G47614.1
    Additional Links
    https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47614.1/587599/Rapid-assembly-of-high-Mg-andesites-and-dacites-by
    Type
    Article
    Language
    en
    ISSN
    0091-7613
    EISSN
    1943-2682
    ae974a485f413a2113503eed53cd6c53
    10.1130/G47614.1
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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