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

Chris E. Conway, Katy J. Chamberlain, Yumiko Harigane, Daniel J. Morgan and Colin J. N. Wilson
Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano
Geology (Boulder) (June 2020) 48 (10): 1033-1037

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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 48
Serial Issue: 10
Title: Rapid assembly of high-Mg andesites and dacites by magma mixing at a continental arc stratovolcano
Affiliation: National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan, Research Institute of Earthquake and Volcano Geology, Tsukuba, Japan
Pages: 1033-1037
Published: 20200625
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2020-060727
Categories: Igneous and metamorphic petrologyQuaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
S39°17'60" - S39°17'60", E175°35'60" - E175°35'60"
Secondary Affiliation: University of Derby, School of Environmental Science, GBR, United KingdomUniversity of Leeds, School of Earth and Environment, GBR, United KingdomVictoria University of Wellington, School of Geography, Environment and Earth Sciences, NZL, New Zealand
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 202037
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