Melt movement through the Icelandic crust.
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Publication Date
2019-02-25Journal Title
Philos Trans A Math Phys Eng Sci
ISSN
1364-503X
Publisher
The Royal Society
Volume
377
Issue
2139
Pages
20180010
Language
eng
Type
Article
Physical Medium
Print
Metadata
Show full item recordCitation
White, R. S., Edmonds, M., Maclennan, J., Greenfield, T., & Agustsdottir, T. (2019). Melt movement through the Icelandic crust.. Philos Trans A Math Phys Eng Sci, 377 (2139), 20180010. https://doi.org/10.1098/rsta.2018.0010
Abstract
We use both seismology and geobarometry to investigate the movement of melt through the volcanic crust of Iceland. We have captured melt in the act of moving within or through a series of sills ranging from the upper mantle to the shallow crust by the clusters of small earthquakes it produces as it forces its way upward. The melt is injected not just beneath the central volcanoes, but also at discrete locations along the rift zones and above the centre of the underlying mantle plume. We suggest that the high strain rates required to produce seismicity at depths of 10-25 km in a normally ductile part of the Icelandic crust are linked to the exsolution of carbon dioxide from the basaltic melts. The seismicity and geobarometry provide complementary information on the way that the melt moves through the crust, stalling and fractionating, and often freezing in one or more melt lenses on its way upwards: the seismicity shows what is happening instantaneously today, while the geobarometry gives constraints averaged over longer time scales on the depths of residence in the crust of melts prior to their eruption. This article is part of the Theo Murphy meeting issue 'Magma reservoir architecture and dynamics'.
Keywords
Iceland, basaltic melt, carbon dioxide, geobarometry, rifts, seismology
Sponsorship
Natural Environment Research Council (NE/F011407/1)
Natural Environment Research Council (NE/H025006/1)
Natural Environment Research Council (NE/I018263/1)
Natural Environment Research Council (NE/M017427/1)
European Commission (308377)
Natural Environment Research Council (NE/I012508/1)
Royal Society (IE50300)
NERC (via British Geological Survey (BGS)) (GA/14S/021/)
Identifiers
External DOI: https://doi.org/10.1098/rsta.2018.0010
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283064
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