Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean
Ultraslow spreading ridges are poorly understood plate boundaries consisting of magmatic and amagmatic segments that expose mostly mantle peridotite and only traces of basalt and gabbro. The slowest part of the global spreading system is represented by the eastern Gakkel Ridge in the Central Arctic...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://epic.awi.de/id/eprint/50491/ https://epic.awi.de/id/eprint/50491/1/Jokat-2019-g3-GakkelDeepGeochemistry.pdf https://hdl.handle.net/10013/epic.e3071f66-4983-4477-a84b-6b7b58eba973 https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:50491 2023-05-15T14:27:07+02:00 Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean Jokat, Wilfried O'Connor, John Hauff, Folkmar Koppers, Anthony A.P. Miggins, D 2019-12-12 application/pdf https://epic.awi.de/id/eprint/50491/ https://epic.awi.de/id/eprint/50491/1/Jokat-2019-g3-GakkelDeepGeochemistry.pdf https://hdl.handle.net/10013/epic.e3071f66-4983-4477-a84b-6b7b58eba973 https://hdl.handle.net/ unknown Wiley https://epic.awi.de/id/eprint/50491/1/Jokat-2019-g3-GakkelDeepGeochemistry.pdf https://hdl.handle.net/ Jokat, W. orcid:0000-0002-7793-5854 , O'Connor, J. , Hauff, F. , Koppers, A. A. and Miggins, D. (2019) Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean , Geochemistry Geophysics Geosystems, 20 . doi:10.1029/2019GC008297 <https://doi.org/10.1029/2019GC008297> , hdl:10013/epic.e3071f66-4983-4477-a84b-6b7b58eba973 EPIC3Geochemistry Geophysics Geosystems, Wiley, 20, ISSN: 1525-2027 Article isiRev 2019 ftawi https://doi.org/10.1029/2019GC008297 2021-12-24T15:45:01Z Ultraslow spreading ridges are poorly understood plate boundaries consisting of magmatic and amagmatic segments that expose mostly mantle peridotite and only traces of basalt and gabbro. The slowest part of the global spreading system is represented by the eastern Gakkel Ridge in the Central Arctic Ocean, where crustal accretion is characterized by extreme focusing of melt to discrete magmatic centers. Close to its eastern tip lies the unusual 5,310 m deep Gakkel Rift Deep (GRD) with limited sediment infill, which is in strong contrast to the broader sediment-filled rift valleys to the east and west. Here, we report an 40Ar/39Ar age of 3.65±0.01 Ma for a pillow basalt from a seamount located on the rim the GRD confirming ultraslow spreading rates of ~7 mm/yr close to the Laptev Sea as suggested from aeromagnetic data. Its geochemistry points to an alkaline lava, attributed to partial melting of a source that underwent prior geochemical enrichment. We note that the GRD extracts compositionally similar melts as the sparsely magmatic zone further west but at much slower spreading velocities of only ~6-7 mm/yr, indicating the widespread occurrence of similarly fertile mantle in the High Arctic. This enriched source differs from sub-continental lithospheric mantle that influences magmatism along the Western Volcanic Zone (Goldstein et al. 2008) and is similar to metasomatized mantle - shown to influence melt genesis along the Eastern Volcanic Zone. Article in Journal/Newspaper Arctic Arctic Arctic Ocean laptev Laptev Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Gakkel Ridge ENVELOPE(90.000,90.000,87.000,87.000) Laptev Sea Geochemistry, Geophysics, Geosystems 20 12 6033 6050 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Ultraslow spreading ridges are poorly understood plate boundaries consisting of magmatic and amagmatic segments that expose mostly mantle peridotite and only traces of basalt and gabbro. The slowest part of the global spreading system is represented by the eastern Gakkel Ridge in the Central Arctic Ocean, where crustal accretion is characterized by extreme focusing of melt to discrete magmatic centers. Close to its eastern tip lies the unusual 5,310 m deep Gakkel Rift Deep (GRD) with limited sediment infill, which is in strong contrast to the broader sediment-filled rift valleys to the east and west. Here, we report an 40Ar/39Ar age of 3.65±0.01 Ma for a pillow basalt from a seamount located on the rim the GRD confirming ultraslow spreading rates of ~7 mm/yr close to the Laptev Sea as suggested from aeromagnetic data. Its geochemistry points to an alkaline lava, attributed to partial melting of a source that underwent prior geochemical enrichment. We note that the GRD extracts compositionally similar melts as the sparsely magmatic zone further west but at much slower spreading velocities of only ~6-7 mm/yr, indicating the widespread occurrence of similarly fertile mantle in the High Arctic. This enriched source differs from sub-continental lithospheric mantle that influences magmatism along the Western Volcanic Zone (Goldstein et al. 2008) and is similar to metasomatized mantle - shown to influence melt genesis along the Eastern Volcanic Zone. |
format |
Article in Journal/Newspaper |
author |
Jokat, Wilfried O'Connor, John Hauff, Folkmar Koppers, Anthony A.P. Miggins, D |
spellingShingle |
Jokat, Wilfried O'Connor, John Hauff, Folkmar Koppers, Anthony A.P. Miggins, D Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean |
author_facet |
Jokat, Wilfried O'Connor, John Hauff, Folkmar Koppers, Anthony A.P. Miggins, D |
author_sort |
Jokat, Wilfried |
title |
Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean |
title_short |
Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean |
title_full |
Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean |
title_fullStr |
Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean |
title_full_unstemmed |
Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean |
title_sort |
ultraslow spreading and volcanism at the eastern end of gakkel ridge, arctic ocean |
publisher |
Wiley |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/50491/ https://epic.awi.de/id/eprint/50491/1/Jokat-2019-g3-GakkelDeepGeochemistry.pdf https://hdl.handle.net/10013/epic.e3071f66-4983-4477-a84b-6b7b58eba973 https://hdl.handle.net/ |
long_lat |
ENVELOPE(90.000,90.000,87.000,87.000) |
geographic |
Arctic Arctic Ocean Gakkel Ridge Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Gakkel Ridge Laptev Sea |
genre |
Arctic Arctic Arctic Ocean laptev Laptev Sea |
genre_facet |
Arctic Arctic Arctic Ocean laptev Laptev Sea |
op_source |
EPIC3Geochemistry Geophysics Geosystems, Wiley, 20, ISSN: 1525-2027 |
op_relation |
https://epic.awi.de/id/eprint/50491/1/Jokat-2019-g3-GakkelDeepGeochemistry.pdf https://hdl.handle.net/ Jokat, W. orcid:0000-0002-7793-5854 , O'Connor, J. , Hauff, F. , Koppers, A. A. and Miggins, D. (2019) Ultraslow spreading and volcanism at the eastern end of Gakkel Ridge, Arctic Ocean , Geochemistry Geophysics Geosystems, 20 . doi:10.1029/2019GC008297 <https://doi.org/10.1029/2019GC008297> , hdl:10013/epic.e3071f66-4983-4477-a84b-6b7b58eba973 |
op_doi |
https://doi.org/10.1029/2019GC008297 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
20 |
container_issue |
12 |
container_start_page |
6033 |
op_container_end_page |
6050 |
_version_ |
1766300715132649472 |