Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano
Journal article
Authors | Conway, Chris, Chamberlain, Katy J., Harigane, Yumiko, Morgan, Daniel and Wilson, Colin |
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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. |
Keywords | magmatism; volcanology; Ruapehu volcano |
Year | 2020 |
Journal | Geology |
Publisher | The Geological Society of America |
ISSN | 0091-7613 |
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 dates | 25 Jun 2020 |
Publication process dates | |
Deposited | 29 Jun 2020, 07:58 |
Accepted | 27 May 2020 |
Contributors | Research 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 |
File | File Access Level Open |
File | |
File | File Access Level Open |
https://repository.derby.ac.uk/item/93043/rapid-assembly-of-high-mg-andesites-and-dacites-by-magma-mixing-at-a-continental-arc-stratovolcano
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