Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research
The Cenozoic evolution of the Arctic Ocean is closely related to two tectonic events: the rifting of the Lomonosov Ridge from the Siberian Shelf, and the opening of the Fram Strait. The duration of the rift phase between the Lomonosov Ridge and the shelf is poorly constrained by marine data, and is...
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ftawi:oai:epic.awi.de:20671 2023-05-15T14:21:00+02:00 Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research Jokat, Wilfried 2009 https://epic.awi.de/id/eprint/20671/ https://hdl.handle.net/10013/epic.32860 unknown Jokat, W. orcid:0000-0002-7793-5854 (2009) Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research , UK Arctic Science Conference 2009 13 - 15 July 2009, National Oceanography Centre, Southampton, UK. . hdl:10013/epic.32860 EPIC3UK Arctic Science Conference 2009 13 - 15 July 2009, National Oceanography Centre, Southampton, UK. Conference notRev 2009 ftawi 2021-12-24T15:33:30Z The Cenozoic evolution of the Arctic Ocean is closely related to two tectonic events: the rifting of the Lomonosov Ridge from the Siberian Shelf, and the opening of the Fram Strait. The duration of the rift phase between the Lomonosov Ridge and the shelf is poorly constrained by marine data, and is difficult to describe. The drift of the rigde, however, is well documented by seafloor spreading anomalies in the Amundsen and Nansen basins. During most of the basin formation the spreading was ultra slow, as indicated by magnetic and seismic data. The only scientific deep drill hole in the central Arctic is located on the ridge. Analyses showed that the environment between 55 and 45 Ma was completely different to what we observe today. E.g., surface water temperatures were well above 20°C in the summer. Unfortunately, the drilling information is not complete in describing the transition from the warm Arctic to the present day situation.Thus, the role of the Fram Strait opening some 15 Ma between North Greenland and Svalbard is speculative. Coring information indicates that around 17 Ma the Arctic Ocean became ventilated, which can be related to the final formation of a deep water connection in the Fram Strait. Geophysical data furthermore indicate that most likely before that tectonic event shallow water connections existed in the Fram Strait to allow limited water exchange e.g. across the Yermak Plateau. In order to address these problems continued broad research activities are necessary including deep drilling during the next decade. Conference Object Arctic Arctic Arctic Ocean Fram Strait Greenland Lomonosov Ridge North Greenland Svalbard Yermak plateau Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Greenland Svalbard Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
The Cenozoic evolution of the Arctic Ocean is closely related to two tectonic events: the rifting of the Lomonosov Ridge from the Siberian Shelf, and the opening of the Fram Strait. The duration of the rift phase between the Lomonosov Ridge and the shelf is poorly constrained by marine data, and is difficult to describe. The drift of the rigde, however, is well documented by seafloor spreading anomalies in the Amundsen and Nansen basins. During most of the basin formation the spreading was ultra slow, as indicated by magnetic and seismic data. The only scientific deep drill hole in the central Arctic is located on the ridge. Analyses showed that the environment between 55 and 45 Ma was completely different to what we observe today. E.g., surface water temperatures were well above 20°C in the summer. Unfortunately, the drilling information is not complete in describing the transition from the warm Arctic to the present day situation.Thus, the role of the Fram Strait opening some 15 Ma between North Greenland and Svalbard is speculative. Coring information indicates that around 17 Ma the Arctic Ocean became ventilated, which can be related to the final formation of a deep water connection in the Fram Strait. Geophysical data furthermore indicate that most likely before that tectonic event shallow water connections existed in the Fram Strait to allow limited water exchange e.g. across the Yermak Plateau. In order to address these problems continued broad research activities are necessary including deep drilling during the next decade. |
format |
Conference Object |
author |
Jokat, Wilfried |
spellingShingle |
Jokat, Wilfried Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research |
author_facet |
Jokat, Wilfried |
author_sort |
Jokat, Wilfried |
title |
Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research |
title_short |
Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research |
title_full |
Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research |
title_fullStr |
Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research |
title_full_unstemmed |
Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research |
title_sort |
geodynamic evolution of the arctic ocean during the cenozoic: challenges for geoscientific research |
publishDate |
2009 |
url |
https://epic.awi.de/id/eprint/20671/ https://hdl.handle.net/10013/epic.32860 |
long_lat |
ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Arctic Arctic Ocean Greenland Svalbard Yermak Plateau |
geographic_facet |
Arctic Arctic Ocean Greenland Svalbard Yermak Plateau |
genre |
Arctic Arctic Arctic Ocean Fram Strait Greenland Lomonosov Ridge North Greenland Svalbard Yermak plateau |
genre_facet |
Arctic Arctic Arctic Ocean Fram Strait Greenland Lomonosov Ridge North Greenland Svalbard Yermak plateau |
op_source |
EPIC3UK Arctic Science Conference 2009 13 - 15 July 2009, National Oceanography Centre, Southampton, UK. |
op_relation |
Jokat, W. orcid:0000-0002-7793-5854 (2009) Geodynamic evolution of the Arctic Ocean during the Cenozoic: Challenges for geoscientific research , UK Arctic Science Conference 2009 13 - 15 July 2009, National Oceanography Centre, Southampton, UK. . hdl:10013/epic.32860 |
_version_ |
1766293566948114432 |