Conway, CE, Chamberlain, KJ, Harigane, Y et al. (2 more authors) (2020) Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano. Geology. ISSN 0091-7613
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 time scales 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 time scales 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.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2020 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 19 Aug 2020 14:58 |
Last Modified: | 19 Aug 2020 14:58 |
Status: | Published online |
Publisher: | Geological Society of America |
Identification Number: | 10.1130/g47614.1 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:164446 |