Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean
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 progres...
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Online Access: | https://oceanrep.geomar.de/id/eprint/33364/ https://oceanrep.geomar.de/id/eprint/33364/1/gakkel.pdf https://doi.org/10.1038/nature01704 |
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ftoceanrep:oai:oceanrep.geomar.de:33364 2023-05-15T14:27:05+02:00 Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean Michael, P. J. Langmuir, C. H. Dick, H. J. B. Snow, J. E. Goldstein, S. L. Graham, D. W. Lehnert, K. Kurras, G. Jokat, W. Mühe, R. Edmonds, H. N. 2003 text https://oceanrep.geomar.de/id/eprint/33364/ https://oceanrep.geomar.de/id/eprint/33364/1/gakkel.pdf https://doi.org/10.1038/nature01704 en eng Nature Publishing Group https://oceanrep.geomar.de/id/eprint/33364/1/gakkel.pdf Michael, P. J., Langmuir, C. H., Dick, H. J. B., Snow, J. E., Goldstein, S. L., Graham, D. W., Lehnert, K., Kurras, G., Jokat, W., Mühe, R. and Edmonds, H. N. (2003) Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean. Nature, 423 (6943). pp. 956-961. DOI 10.1038/nature01704 <https://doi.org/10.1038/nature01704>. doi:10.1038/nature01704 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2003 ftoceanrep https://doi.org/10.1038/nature01704 2023-04-07T15:26:30Z 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. Article in Journal/Newspaper Arctic Arctic Arctic Ocean North Pole OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean North Pole Gakkel Ridge ENVELOPE(90.000,90.000,87.000,87.000) Breaker ENVELOPE(-67.257,-67.257,-67.874,-67.874) Nature 423 6943 956 961 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Michael, P. J. Langmuir, C. H. Dick, H. J. B. Snow, J. E. Goldstein, S. L. Graham, D. W. Lehnert, K. Kurras, G. Jokat, W. Mühe, R. Edmonds, H. N. |
spellingShingle |
Michael, P. J. Langmuir, C. H. Dick, H. J. B. Snow, J. E. Goldstein, S. L. Graham, D. W. Lehnert, K. Kurras, G. Jokat, W. Mühe, R. Edmonds, H. N. Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean |
author_facet |
Michael, P. J. Langmuir, C. H. Dick, H. J. B. Snow, J. E. Goldstein, S. L. Graham, D. W. Lehnert, K. Kurras, G. Jokat, W. Mühe, R. Edmonds, H. N. |
author_sort |
Michael, P. J. |
title |
Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean |
title_short |
Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean |
title_full |
Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean |
title_fullStr |
Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean |
title_full_unstemmed |
Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean |
title_sort |
magmatic and amagmatic seafloor generation at the ultraslow-spreading gakkel ridge, arctic ocean |
publisher |
Nature Publishing Group |
publishDate |
2003 |
url |
https://oceanrep.geomar.de/id/eprint/33364/ https://oceanrep.geomar.de/id/eprint/33364/1/gakkel.pdf https://doi.org/10.1038/nature01704 |
long_lat |
ENVELOPE(90.000,90.000,87.000,87.000) ENVELOPE(-67.257,-67.257,-67.874,-67.874) |
geographic |
Arctic Arctic Ocean North Pole Gakkel Ridge Breaker |
geographic_facet |
Arctic Arctic Ocean North Pole Gakkel Ridge Breaker |
genre |
Arctic Arctic Arctic Ocean North Pole |
genre_facet |
Arctic Arctic Arctic Ocean North Pole |
op_relation |
https://oceanrep.geomar.de/id/eprint/33364/1/gakkel.pdf Michael, P. J., Langmuir, C. H., Dick, H. J. B., Snow, J. E., Goldstein, S. L., Graham, D. W., Lehnert, K., Kurras, G., Jokat, W., Mühe, R. and Edmonds, H. N. (2003) Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean. Nature, 423 (6943). pp. 956-961. DOI 10.1038/nature01704 <https://doi.org/10.1038/nature01704>. doi:10.1038/nature01704 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1038/nature01704 |
container_title |
Nature |
container_volume |
423 |
container_issue |
6943 |
container_start_page |
956 |
op_container_end_page |
961 |
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1766300651857379328 |