White, R. S. and Edmonds, M. and Maclennan, J. and Greenfield, T. and Ágústsdóttir, T. (2018) Melt movement through the Icelandic crust. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 377. ISSN 1364-503X Online ISSN 1471-2962
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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 it 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 timescales on the depths of residence in the crust of melts prior to their eruption.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2018AREP; IA73 |
| Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
| Divisions: | 02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access 12 - PhD |
| Journal or Publication Title: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
| Volume: | 377 |
| Depositing User: | Sarah Humbert |
| Date Deposited: | 06 Aug 2018 15:41 |
| Last Modified: | 01 Oct 2019 00:00 |
| URI: | http://eprints.esc.cam.ac.uk/id/eprint/4310 |
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