Properties and history of the central eastern Arctic sea floor
The deep eastern Arctic basin between the Lomonosov Ridge and the Eurasian continental margin differs from other ocean basins in the very slow spreading of its floor and unusual depositional environment under perennial sea-ice cover. The recent expedition ARK IV/3 of RV Polar stern for the first tim...
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Cambridge University Press
1990
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Online Access: | https://oceanrep.geomar.de/id/eprint/46669/ https://oceanrep.geomar.de/id/eprint/46669/1/Thiede.pdf https://doi.org/10.1017/S0032247400022695 |
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ftoceanrep:oai:oceanrep.geomar.de:46669 2023-05-15T14:25:39+02:00 Properties and history of the central eastern Arctic sea floor Thiede, Jörn Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. 1990 text https://oceanrep.geomar.de/id/eprint/46669/ https://oceanrep.geomar.de/id/eprint/46669/1/Thiede.pdf https://doi.org/10.1017/S0032247400022695 en eng Cambridge University Press https://oceanrep.geomar.de/id/eprint/46669/1/Thiede.pdf Thiede, J. , Altenbach, A., Bleil, U., Botz, R., Mudie, P., Pfirman, S. and Sundvor, E. (1990) Properties and history of the central eastern Arctic sea floor. Polar Record, 26 (156). pp. 1-6. DOI 10.1017/S0032247400022695 <https://doi.org/10.1017/S0032247400022695>. doi:10.1017/S0032247400022695 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1990 ftoceanrep https://doi.org/10.1017/S0032247400022695 2023-04-07T15:45:27Z The deep eastern Arctic basin between the Lomonosov Ridge and the Eurasian continental margin differs from other ocean basins in the very slow spreading of its floor and unusual depositional environment under perennial sea-ice cover. The recent expedition ARK IV/3 of RV Polar stern for the first time made geoscientific investigations from the northern margin of the Barents Sea north to the Nansen-Gakkel Ridge. Much deeper than most other mid-ocean ridges, this ridge is poorly-surveyed, but has a central valley which in places is deeper than 5.5 km, 1–1.5 km below the basin floors on either side. Heat flow in the central part of the valley is very rapid; both basement rocks and overlying sediments showed unexpectedly the influence of intense and long-term hydrothermal activity. The sediments on the northern and southern flanks of the ridge are slightly calcareous pelagic mud layers alternating with carbonate-free horizons, where up to 40% of the sedimentary section is soft mud clasts. Similar mud aggregates were observed on the surface of the multi-year sea ice, appearing to represent a special type of sediment transport by sea ice in the Transpolar Drift. In contrast to the western Arctic, Fram Strait and the Norwegian-Greenland Sea, gravel is rarely found in sediment cores. Recovered cores indicate that icebergs and sea ice carrying coarse sediment seldom rafted detritus to the study area during the last approximately 300,000 years. Article in Journal/Newspaper Arctic Arctic Basin Arctic Barents Sea Fram Strait Greenland Greenland Sea Iceberg* Lomonosov Ridge Polar Record Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Barents Sea Gakkel Ridge ENVELOPE(90.000,90.000,87.000,87.000) Greenland Polar Record 26 156 1 6 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The deep eastern Arctic basin between the Lomonosov Ridge and the Eurasian continental margin differs from other ocean basins in the very slow spreading of its floor and unusual depositional environment under perennial sea-ice cover. The recent expedition ARK IV/3 of RV Polar stern for the first time made geoscientific investigations from the northern margin of the Barents Sea north to the Nansen-Gakkel Ridge. Much deeper than most other mid-ocean ridges, this ridge is poorly-surveyed, but has a central valley which in places is deeper than 5.5 km, 1–1.5 km below the basin floors on either side. Heat flow in the central part of the valley is very rapid; both basement rocks and overlying sediments showed unexpectedly the influence of intense and long-term hydrothermal activity. The sediments on the northern and southern flanks of the ridge are slightly calcareous pelagic mud layers alternating with carbonate-free horizons, where up to 40% of the sedimentary section is soft mud clasts. Similar mud aggregates were observed on the surface of the multi-year sea ice, appearing to represent a special type of sediment transport by sea ice in the Transpolar Drift. In contrast to the western Arctic, Fram Strait and the Norwegian-Greenland Sea, gravel is rarely found in sediment cores. Recovered cores indicate that icebergs and sea ice carrying coarse sediment seldom rafted detritus to the study area during the last approximately 300,000 years. |
format |
Article in Journal/Newspaper |
author |
Thiede, Jörn Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. |
spellingShingle |
Thiede, Jörn Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. Properties and history of the central eastern Arctic sea floor |
author_facet |
Thiede, Jörn Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. |
author_sort |
Thiede, Jörn |
title |
Properties and history of the central eastern Arctic sea floor |
title_short |
Properties and history of the central eastern Arctic sea floor |
title_full |
Properties and history of the central eastern Arctic sea floor |
title_fullStr |
Properties and history of the central eastern Arctic sea floor |
title_full_unstemmed |
Properties and history of the central eastern Arctic sea floor |
title_sort |
properties and history of the central eastern arctic sea floor |
publisher |
Cambridge University Press |
publishDate |
1990 |
url |
https://oceanrep.geomar.de/id/eprint/46669/ https://oceanrep.geomar.de/id/eprint/46669/1/Thiede.pdf https://doi.org/10.1017/S0032247400022695 |
long_lat |
ENVELOPE(90.000,90.000,87.000,87.000) |
geographic |
Arctic Barents Sea Gakkel Ridge Greenland |
geographic_facet |
Arctic Barents Sea Gakkel Ridge Greenland |
genre |
Arctic Arctic Basin Arctic Barents Sea Fram Strait Greenland Greenland Sea Iceberg* Lomonosov Ridge Polar Record Sea ice |
genre_facet |
Arctic Arctic Basin Arctic Barents Sea Fram Strait Greenland Greenland Sea Iceberg* Lomonosov Ridge Polar Record Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/46669/1/Thiede.pdf Thiede, J. , Altenbach, A., Bleil, U., Botz, R., Mudie, P., Pfirman, S. and Sundvor, E. (1990) Properties and history of the central eastern Arctic sea floor. Polar Record, 26 (156). pp. 1-6. DOI 10.1017/S0032247400022695 <https://doi.org/10.1017/S0032247400022695>. doi:10.1017/S0032247400022695 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1017/S0032247400022695 |
container_title |
Polar Record |
container_volume |
26 |
container_issue |
156 |
container_start_page |
1 |
op_container_end_page |
6 |
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1766298100862812160 |