Effects of present-day deglaciation in Iceland on mantle melt production rates

Schmidt, P. and Lund, B. and Hieronymus, C. and Maclennan, J. and Árnadóttir, T. and Pagli, C. (2013) Effects of present-day deglaciation in Iceland on mantle melt production rates. Journal of Geophysical Research: Solid Earth, 118 (7). pp. 3366-3379. ISSN 2156-2202 DOI 10.1002/jgrb.50273

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/jgrb.50...

Abstract

Ongoing deglaciation in Iceland not only causes uplift at the surface but also increases magma production at depth due to decompression of the mantle. Here we study glacially induced decompression melting using 3-D models of glacial isostatic adjustment in Iceland since 1890. We find that the mean glacially induced pressure rate of change in the mantle increases melt production rates by 100–135%, or an additional 0.21–0.23 km3 of magma per year beneath Iceland. Approximately 50% of this melt is produced underneath central Iceland. The greatest volumetric increase is found directly beneath Iceland's largest ice cap, Vatnajökull, colocated with the most productive volcanoes. Our models of the effect of deglaciation on mantle melting predict a significantly larger volumetric response than previous models which only considered the effect of deglaciation of Vatnajökull, and only mantle melting directly below Vatnajökull. Although the ongoing deglaciation significantly increases the melt production rate, the increase in melt supply rate at the base of the lithosphere is delayed and depends on the melt ascent velocity through the mantle. Assuming that 25% of the melt reaches the surface, the upper limit on our deglaciation-induced melt estimates for central Iceland would be equivalent to an eruption the size of the 2010 Eyjafjallajökull summit eruption every seventh year.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA66;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 08 - Green Open Access
02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Journal of Geophysical Research: Solid Earth
Volume: 118
Page Range: pp. 3366-3379
Identification Number: 10.1002/jgrb.50273
Depositing User: Sarah Humbert
Date Deposited: 28 Sep 2013 23:18
Last Modified: 10 Jul 2014 11:18
URI: http://eprints.esc.cam.ac.uk/id/eprint/2890

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