Basalts from the Centre of the Assumed Icelandic Mantle Plume
Pleistocene to historic basalts in the northern part of the eastern volcanic zone in Iceland may have formed by partial melting over an extended depth range in the centre of the assumed Icelandic mantle plume. Practically all basalt types found on the ocean ridges are represented in this volcanic ri...
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Oxford University Press
1974
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fthighwire:oai:open-archive.highwire.org:petrology:15/3/497 2023-05-15T16:47:36+02:00 Basalts from the Centre of the Assumed Icelandic Mantle Plume SIGVALDASON, GUDMUNDUR E. 1974-01-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/15/3/497 https://doi.org/10.1093/petrology/15.3.497 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/15/3/497 http://dx.doi.org/10.1093/petrology/15.3.497 Copyright (C) 1974, Oxford University Press Articles TEXT 1974 fthighwire https://doi.org/10.1093/petrology/15.3.497 2015-03-01T00:44:48Z Pleistocene to historic basalts in the northern part of the eastern volcanic zone in Iceland may have formed by partial melting over an extended depth range in the centre of the assumed Icelandic mantle plume. Practically all basalt types found on the ocean ridges are represented in this volcanic rift zone. Volume relations are, however, in favour of low degree partial melting products. The basalts differ from ocean ridge basalts in being undepleted in large trace ions, indicating a primary mantle source. The prevalence of low degree partial melting products in Iceland may explain the depleted nature of the astenosphere flowing away from the plume and along the northern part of the Mid-Atlantic Ridge. Volumes of lavas are found to correlate with degree of partial melting. Exceptions from this correlation are found locally and may be explained on the basis of volcano-tectonic implications. A simple model of thermal structure in the mantle plume-ocean ridge system is suggested which may explain some aspects of the compositional variations in basalts within the system. Text Iceland HighWire Press (Stanford University) Mid-Atlantic Ridge Journal of Petrology 15 3 497 524 |
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HighWire Press (Stanford University) |
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English |
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Articles |
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Articles SIGVALDASON, GUDMUNDUR E. Basalts from the Centre of the Assumed Icelandic Mantle Plume |
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Articles |
description |
Pleistocene to historic basalts in the northern part of the eastern volcanic zone in Iceland may have formed by partial melting over an extended depth range in the centre of the assumed Icelandic mantle plume. Practically all basalt types found on the ocean ridges are represented in this volcanic rift zone. Volume relations are, however, in favour of low degree partial melting products. The basalts differ from ocean ridge basalts in being undepleted in large trace ions, indicating a primary mantle source. The prevalence of low degree partial melting products in Iceland may explain the depleted nature of the astenosphere flowing away from the plume and along the northern part of the Mid-Atlantic Ridge. Volumes of lavas are found to correlate with degree of partial melting. Exceptions from this correlation are found locally and may be explained on the basis of volcano-tectonic implications. A simple model of thermal structure in the mantle plume-ocean ridge system is suggested which may explain some aspects of the compositional variations in basalts within the system. |
format |
Text |
author |
SIGVALDASON, GUDMUNDUR E. |
author_facet |
SIGVALDASON, GUDMUNDUR E. |
author_sort |
SIGVALDASON, GUDMUNDUR E. |
title |
Basalts from the Centre of the Assumed Icelandic Mantle Plume |
title_short |
Basalts from the Centre of the Assumed Icelandic Mantle Plume |
title_full |
Basalts from the Centre of the Assumed Icelandic Mantle Plume |
title_fullStr |
Basalts from the Centre of the Assumed Icelandic Mantle Plume |
title_full_unstemmed |
Basalts from the Centre of the Assumed Icelandic Mantle Plume |
title_sort |
basalts from the centre of the assumed icelandic mantle plume |
publisher |
Oxford University Press |
publishDate |
1974 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/15/3/497 https://doi.org/10.1093/petrology/15.3.497 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://petrology.oxfordjournals.org/cgi/content/short/15/3/497 http://dx.doi.org/10.1093/petrology/15.3.497 |
op_rights |
Copyright (C) 1974, Oxford University Press |
op_doi |
https://doi.org/10.1093/petrology/15.3.497 |
container_title |
Journal of Petrology |
container_volume |
15 |
container_issue |
3 |
container_start_page |
497 |
op_container_end_page |
524 |
_version_ |
1766037689766772736 |