Magmatic and Amagmatic Seafloor Generation at the Ultraslow-Spreading Gakkel Ridge, Arctic Ocean

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Magmatic and Amagmatic Seafloor Generation at the Ultraslow-Spreading Gakkel Ridge, Arctic Ocean

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dc.contributor.author Edmonds, Henrietta N.
dc.contributor.author Kurras, Gregory
dc.contributor.author Lehnert, Kerstin
dc.contributor.author Jokat, Wilfried
dc.contributor.author Graham, David W.
dc.contributor.author Muhe, Richard
dc.contributor.author Goldstein, Steven L.
dc.contributor.author Snow, Jonathan E.
dc.contributor.author Dick, Henry J.B.
dc.contributor.author Michael, Peter J.
dc.contributor.author Langmuir, Charles
dc.date.accessioned 2009-08-25T20:28:24Z
dc.date.issued 2003
dc.identifier.citation Michael, Peter J., Charles H. Langmuir, Henry J.B. Dick, Jonathan E. Snow, Steven L. Goldstein, David W. Graham, Kerstin Lehnert, Gregory Kurras, Wilfried Jokat, Richard Mühe, and Henrietta N. Edmonds. 2003. Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean. Nature 423: 956-961. en
dc.identifier.issn 0028-0836 en
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3224741
dc.description.abstract A high-resolution mapping and sampling study of the Gakkel ridge was accomplished during an international ice-breaker expedition to the high Arctic and North Pole in summer 2001. For this slowest-spreading endmember of the global mid-ocean-ridge system, predictions were that magmatism should progressively diminish as the spreading rate decreases along the ridge, and that hydrothermal activity should be rare. Instead, it was found that magmatic variations are irregular, and that hydrothermal activity is abundant. A 300-kilometre-long central amagmatic zone, where mantle peridotites are emplaced directly in the ridge axis, lies between abundant, continuous volcanism in the west, and large, widely spaced volcanic centres in the east. These observations demonstrate that the extent of mantle melting is not a simple function of spreading rate: mantle temperatures at depth or mantle chemistry ( or both) must vary significantly along-axis. Highly punctuated volcanism in the absence of ridge offsets suggests that first-order ridge segmentation is controlled by mantle processes of melting and melt segregation. The strong focusing of magmatic activity coupled with faulting may account for the unexpectedly high levels of hydrothermal activity observed. en
dc.description.sponsorship Earth and Planetary Sciences en
dc.language.iso en_US en
dc.publisher Nature Publishing Group en
dc.relation.isversionof http://dx.doi.org/10.1038/nature01704 en
dc.relation.hasversion http://www.people.fas.harvard.edu/~langmuir/homepage.html en
dash.license META_ONLY
dc.title Magmatic and Amagmatic Seafloor Generation at the Ultraslow-Spreading Gakkel Ridge, Arctic Ocean en
dc.relation.journal Nature en
dash.depositing.author Langmuir, Charles
dash.embargo.until 10000-01-01

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  • FAS Scholarly Articles [7374]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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