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Abstract. Rifted margins form from extension and breakup of the con-tinental lithosphere. If this extension is coeval with a region of hotter litho-sphere, then it is generally assumed that a volcanic margin would follow. Here we present the results of numerical simulations of rift margin evolution...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.655.6118 2023-05-15T16:29:15+02:00 1 J. J. Armitage T. J. Henstock T A. Minshull The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.655.6118 http://eprints.soton.ac.uk/66801/1/jjarmitage-submitted.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.655.6118 http://eprints.soton.ac.uk/66801/1/jjarmitage-submitted.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://eprints.soton.ac.uk/66801/1/jjarmitage-submitted.pdf text ftciteseerx 2016-01-08T16:35:48Z Abstract. Rifted margins form from extension and breakup of the con-tinental lithosphere. If this extension is coeval with a region of hotter litho-sphere, then it is generally assumed that a volcanic margin would follow. Here we present the results of numerical simulations of rift margin evolution by extending continental lithosphere above a thermal anomaly. We find that un-less the lithosphere is thinned prior to the arrival of the thermal anomaly or half spreading rates are more than ∼ 50mmyr−1, the lithosphere acts as a lid to the hot material. The thermal anomaly cools significantly by con-duction before having an effect on decompression melt production. If the litho-sphere is thinned by the formation of extensional basins then the thermal anomaly advects into the thinned region and leads to enhanced decompres-sion melting. In the North Atlantic a series of extensional basins off the coast of northwest Europe and Greenland provide the required thinning. This ob-servation suggests that volcanic margins that show slow rates of extension, only occur where there is the combination of a thermal anomaly and pre- Text Greenland North Atlantic Unknown Greenland Sion ENVELOPE(13.758,13.758,66.844,66.844) |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Abstract. Rifted margins form from extension and breakup of the con-tinental lithosphere. If this extension is coeval with a region of hotter litho-sphere, then it is generally assumed that a volcanic margin would follow. Here we present the results of numerical simulations of rift margin evolution by extending continental lithosphere above a thermal anomaly. We find that un-less the lithosphere is thinned prior to the arrival of the thermal anomaly or half spreading rates are more than ∼ 50mmyr−1, the lithosphere acts as a lid to the hot material. The thermal anomaly cools significantly by con-duction before having an effect on decompression melt production. If the litho-sphere is thinned by the formation of extensional basins then the thermal anomaly advects into the thinned region and leads to enhanced decompres-sion melting. In the North Atlantic a series of extensional basins off the coast of northwest Europe and Greenland provide the required thinning. This ob-servation suggests that volcanic margins that show slow rates of extension, only occur where there is the combination of a thermal anomaly and pre- |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J. J. Armitage T. J. Henstock T A. Minshull |
spellingShingle |
J. J. Armitage T. J. Henstock T A. Minshull 1 |
author_facet |
J. J. Armitage T. J. Henstock T A. Minshull |
author_sort |
J. J. Armitage |
title |
1 |
title_short |
1 |
title_full |
1 |
title_fullStr |
1 |
title_full_unstemmed |
1 |
title_sort |
1 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.655.6118 http://eprints.soton.ac.uk/66801/1/jjarmitage-submitted.pdf |
long_lat |
ENVELOPE(13.758,13.758,66.844,66.844) |
geographic |
Greenland Sion |
geographic_facet |
Greenland Sion |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
http://eprints.soton.ac.uk/66801/1/jjarmitage-submitted.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.655.6118 http://eprints.soton.ac.uk/66801/1/jjarmitage-submitted.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766018932531003392 |