Properties and history of the central eastern Arctic sea floor
ABSTRACT 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...
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1990
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crcambridgeupr:10.1017/s0032247400022695 2024-03-03T08:40:15+00:00 Properties and history of the central eastern Arctic sea floor Thiede, J. Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. 1990 http://dx.doi.org/10.1017/s0032247400022695 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400022695 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Polar Record volume 26, issue 156, page 1-6 ISSN 0032-2474 1475-3057 General Earth and Planetary Sciences Ecology Geography, Planning and Development journal-article 1990 crcambridgeupr https://doi.org/10.1017/s0032247400022695 2024-02-08T08:34:44Z ABSTRACT 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 Basin Arctic Barents Sea Fram Strait Greenland Greenland Sea Iceberg* Lomonosov Ridge Polar Record Sea ice Cambridge University Press Arctic Barents Sea Greenland Gakkel Ridge ENVELOPE(90.000,90.000,87.000,87.000) Polar Record 26 156 1 6 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences Ecology Geography, Planning and Development |
spellingShingle |
General Earth and Planetary Sciences Ecology Geography, Planning and Development Thiede, J. Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. Properties and history of the central eastern Arctic sea floor |
topic_facet |
General Earth and Planetary Sciences Ecology Geography, Planning and Development |
description |
ABSTRACT 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, J. Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. |
author_facet |
Thiede, J. Altenbach, A. Bleil, U. Botz, R. Mudie, P. Pfirman, S. Sundvor, E. |
author_sort |
Thiede, J. |
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 (CUP) |
publishDate |
1990 |
url |
http://dx.doi.org/10.1017/s0032247400022695 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400022695 |
long_lat |
ENVELOPE(90.000,90.000,87.000,87.000) |
geographic |
Arctic Barents Sea Greenland Gakkel Ridge |
geographic_facet |
Arctic Barents Sea Greenland Gakkel Ridge |
genre |
Arctic Basin Arctic Barents Sea Fram Strait Greenland Greenland Sea Iceberg* Lomonosov Ridge Polar Record Sea ice |
genre_facet |
Arctic Basin Arctic Barents Sea Fram Strait Greenland Greenland Sea Iceberg* Lomonosov Ridge Polar Record Sea ice |
op_source |
Polar Record volume 26, issue 156, page 1-6 ISSN 0032-2474 1475-3057 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0032247400022695 |
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Polar Record |
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26 |
container_issue |
156 |
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1 |
op_container_end_page |
6 |
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1792496003205562368 |