Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge
The composition of upper mantle and lower crustal material at very-slow spreading centers cannot be reliably determined by seismic studies alone. Since the range of P-wave velocities for serpentinized peridotites and gabbros overlap, additional information provided by the major and rare earth elemen...
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ftarchimer:oai:archimer.ifremer.fr:10536 2023-05-15T16:29:12+02:00 Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge Klingelhofer, F Geli, Louis White, Rs 2000-05 application/pdf https://archimer.ifremer.fr/doc/00000/10536/9397.pdf https://archimer.ifremer.fr/doc/00000/10536/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00000/10536/9397.pdf https://archimer.ifremer.fr/doc/00000/10536/ 2000 AGU info:eu-repo/semantics/openAccess restricted use Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2000-05 , Vol. 27 , N. 10 , P. 1547-1550 text Publication info:eu-repo/semantics/article 2000 ftarchimer 2021-09-23T20:18:03Z The composition of upper mantle and lower crustal material at very-slow spreading centers cannot be reliably determined by seismic studies alone. Since the range of P-wave velocities for serpentinized peridotites and gabbros overlap, additional information provided by the major and rare earth element (REE) content of the basalts is useful to constrain interpretations of seismic data. Refraction seismic data from the very slow spreading (16 mm/a, full rate) Mohns Ridge in the Norwegian-Greenland Sea yields a highly variable thin crust of 4.0 +/- 0.5 km thickness. Analysis of S-waves suggests that Layer 3 is composed primarily of gabbro containing at most a small percentage (< 20%) of mantle material. The Nas content of Mohns Ridge basalts suggests a magmatic crustal thickness of 4-5 km. Inversion of the REE concentrations yields a melt thickness of similar to 5 km. This agreement between seismic and geochemical data suggests that neither large quantities of mantle material are found in the lower crust nor is a large volume of basaltic magma frozen in the upper mantle. Article in Journal/Newspaper Greenland Greenland Sea Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The composition of upper mantle and lower crustal material at very-slow spreading centers cannot be reliably determined by seismic studies alone. Since the range of P-wave velocities for serpentinized peridotites and gabbros overlap, additional information provided by the major and rare earth element (REE) content of the basalts is useful to constrain interpretations of seismic data. Refraction seismic data from the very slow spreading (16 mm/a, full rate) Mohns Ridge in the Norwegian-Greenland Sea yields a highly variable thin crust of 4.0 +/- 0.5 km thickness. Analysis of S-waves suggests that Layer 3 is composed primarily of gabbro containing at most a small percentage (< 20%) of mantle material. The Nas content of Mohns Ridge basalts suggests a magmatic crustal thickness of 4-5 km. Inversion of the REE concentrations yields a melt thickness of similar to 5 km. This agreement between seismic and geochemical data suggests that neither large quantities of mantle material are found in the lower crust nor is a large volume of basaltic magma frozen in the upper mantle. |
format |
Article in Journal/Newspaper |
author |
Klingelhofer, F Geli, Louis White, Rs |
spellingShingle |
Klingelhofer, F Geli, Louis White, Rs Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge |
author_facet |
Klingelhofer, F Geli, Louis White, Rs |
author_sort |
Klingelhofer, F |
title |
Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge |
title_short |
Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge |
title_full |
Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge |
title_fullStr |
Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge |
title_full_unstemmed |
Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge |
title_sort |
geophysical and geochemical constraints on crustal accretion at the very-slow spreading mohns ridge |
publisher |
Amer Geophysical Union |
publishDate |
2000 |
url |
https://archimer.ifremer.fr/doc/00000/10536/9397.pdf https://archimer.ifremer.fr/doc/00000/10536/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland Sea |
genre_facet |
Greenland Greenland Sea |
op_source |
Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2000-05 , Vol. 27 , N. 10 , P. 1547-1550 |
op_relation |
https://archimer.ifremer.fr/doc/00000/10536/9397.pdf https://archimer.ifremer.fr/doc/00000/10536/ |
op_rights |
2000 AGU info:eu-repo/semantics/openAccess restricted use |
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1766018886433505280 |