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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Stock MJ,Taylor RN,Gernon TMdoi
10.1038/srep00731subject
Has Abstractpub_date
2012-01-01 00:00:00pages
731issn
2045-2322journal_volume
2pub_type
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