The importance of rift history for volcanic margin formation

John J. Armitage (), Jenny S. Collier and Tim A. Minshull
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John J. Armitage: Imperial College London
Jenny S. Collier: Imperial College London
Tim A. Minshull: National Oceanography Centre, Southampton, University of Southampton

Nature, 2010, vol. 465, issue 7300, 913-917

Abstract: Rift history on the volcanic margins Continental break-up is accompanied by highly variable amounts of magmatism. At some margins massive outpouring of igneous material occurs, whilst at others there is almost none. John Armitage and colleagues apply a numerical model that explicitly accounts for the effects of earlier episodes of extension to compare magmatism generated during continental rifting. They find that the volume of rift-related magmatism generated, both in the northwest Indian Ocean and North Atlantic margins, depends not only on the mantle temperature but also, to a similar degree, on the rift history. The inherited extensional history can either suppress or enhance melt generation, and this dependence explains some previously enigmatic observations.

Date: 2010
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DOI: 10.1038/nature09063

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