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

Journal article


Conway, Chris, Chamberlain, Katy J., Harigane, Yumiko, Morgan, Daniel and Wilson, Colin 2020. Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano. Geology. https://doi.org/10.1130/G47614.1
AuthorsConway, Chris, Chamberlain, Katy J., Harigane, Yumiko, Morgan, Daniel and Wilson, Colin
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.

Keywordsmagmatism; volcanology; Ruapehu volcano
Year2020
JournalGeology
PublisherThe Geological Society of America
ISSN0091-7613
1943-2682
Digital Object Identifier (DOI)https://doi.org/10.1130/G47614.1
Web address (URL)http://hdl.handle.net/10545/624941
hdl:10545/624941
Publication dates25 Jun 2020
Publication process dates
Deposited29 Jun 2020, 07:58
Accepted27 May 2020
ContributorsResearch Institute of Earthquake and Volcano Geology, Japan, National Museum of Nature and Science, Japan, University of Derby, University of Leeds and Victoria University of Wellington
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