Effects of present-day deglaciation in Iceland on mantle melt production rates
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 g...
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Online Access: | http://hdl.handle.net/11568/500303 https://doi.org/10.1002/jgrb.50273 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgrb.50273 |
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ftunivpisairis:oai:arpi.unipi.it:11568/500303 2024-02-27T08:40:19+00:00 Effects of present-day deglaciation in Iceland on mantle melt production rates P. Schmidt B. Lund C. Hieronymus J. Maclennan T. Arnadottir PAGLI, CAROLINA P., Schmidt B., Lund C., Hieronymu J., Maclennan T., Arnadottir Pagli, Carolina 2013 http://hdl.handle.net/11568/500303 https://doi.org/10.1002/jgrb.50273 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgrb.50273 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000324952300008 volume:118 firstpage:3366 lastpage:3379 numberofpages:14 journal:JOURNAL OF GEOPHYSICAL RESEARCH. SOLID EARTH http://hdl.handle.net/11568/500303 doi:10.1002/jgrb.50273 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84882799728 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgrb.50273 info:eu-repo/semantics/openAccess decompression melting GIA Iceland mantle melting volcanism deglaciation info:eu-repo/semantics/article 2013 ftunivpisairis https://doi.org/10.1002/jgrb.50273 2024-01-31T17:45:08Z 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. Article in Journal/Newspaper Eyjafjallajökull Ice cap Iceland Vatnajökull ARPI - Archivio della Ricerca dell'Università di Pisa Vatnajökull ENVELOPE(-16.823,-16.823,64.420,64.420) Journal of Geophysical Research: Solid Earth 118 7 3366 3379 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
decompression melting GIA Iceland mantle melting volcanism deglaciation |
spellingShingle |
decompression melting GIA Iceland mantle melting volcanism deglaciation P. Schmidt B. Lund C. Hieronymus J. Maclennan T. Arnadottir PAGLI, CAROLINA Effects of present-day deglaciation in Iceland on mantle melt production rates |
topic_facet |
decompression melting GIA Iceland mantle melting volcanism deglaciation |
description |
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. |
author2 |
P., Schmidt B., Lund C., Hieronymu J., Maclennan T., Arnadottir Pagli, Carolina |
format |
Article in Journal/Newspaper |
author |
P. Schmidt B. Lund C. Hieronymus J. Maclennan T. Arnadottir PAGLI, CAROLINA |
author_facet |
P. Schmidt B. Lund C. Hieronymus J. Maclennan T. Arnadottir PAGLI, CAROLINA |
author_sort |
P. Schmidt |
title |
Effects of present-day deglaciation in Iceland on mantle melt production rates |
title_short |
Effects of present-day deglaciation in Iceland on mantle melt production rates |
title_full |
Effects of present-day deglaciation in Iceland on mantle melt production rates |
title_fullStr |
Effects of present-day deglaciation in Iceland on mantle melt production rates |
title_full_unstemmed |
Effects of present-day deglaciation in Iceland on mantle melt production rates |
title_sort |
effects of present-day deglaciation in iceland on mantle melt production rates |
publishDate |
2013 |
url |
http://hdl.handle.net/11568/500303 https://doi.org/10.1002/jgrb.50273 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgrb.50273 |
long_lat |
ENVELOPE(-16.823,-16.823,64.420,64.420) |
geographic |
Vatnajökull |
geographic_facet |
Vatnajökull |
genre |
Eyjafjallajökull Ice cap Iceland Vatnajökull |
genre_facet |
Eyjafjallajökull Ice cap Iceland Vatnajökull |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000324952300008 volume:118 firstpage:3366 lastpage:3379 numberofpages:14 journal:JOURNAL OF GEOPHYSICAL RESEARCH. SOLID EARTH http://hdl.handle.net/11568/500303 doi:10.1002/jgrb.50273 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84882799728 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgrb.50273 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/jgrb.50273 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
118 |
container_issue |
7 |
container_start_page |
3366 |
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3379 |
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