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Triggering of major eruptions recorded by actively forming cumulates

Stock, Michael J., Taylor, Rex N. and Gernon, Thomas M. (2012) Triggering of major eruptions recorded by actively forming cumulates Scientific Reports, 2, Art.731. (doi:10.1038/srep00731).

Record type: Article

Abstract

Major overturn within a magma chamber can bring together felsic and mafic magmas, prompting de-volatilisation and acting as the driver for Plinian eruptions. Until now identification of mixing has been limited to analysis of lavas or individual crystals ejected during eruptions. We have recovered partially developed cumulate material (‘live’ cumulate mush) from pyroclastic deposits of major eruptions on Tenerife. These samples represent “frozen” clumps of diverse crystalline deposits from all levels in the developing reservoir, which are permeated with the final magma immediately before eruptions. Such events therefore record the complete disintegration of the magma chamber, leading to caldera collapse. Chemical variation across developing cumulus crystals records changes in melt composition. Apart from fluctuations reflecting periodic influxes of mafic melt, crystal edges consistently record the presence of more felsic magmas. The prevalence of this felsic liquid implies it was able to infiltrate the entire cumulate pile immediately before each eruption.

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More information

Published date: 12 October 2012
Keywords: Geochemistry, Petrology, Volcanology
Organisations: Geology & Geophysics, Geochemistry

Identifiers

Local EPrints ID: 345135
URI: http://eprints.soton.ac.uk/id/eprint/345135
PURE UUID: 0df57aeb-54f2-4824-9a61-b12eef6a6b61

Catalogue record

Date deposited: 08 Nov 2012 16:23
Last modified: 18 Jul 2017 05:12

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Contributors

Author: Michael J. Stock
Author: Rex N. Taylor

University divisions

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