| Titre | The structure of the Lomonosov Ridge, Arctic Ocean (invited) |
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| Auteur | Jackson, H R ;
Marcussen, C; Funck, T; Jakobsson, M; Hell, B |
| Source | American Geophysical Union 2010 Fall Annual Meeting, abstracts; T31A-2122, 2010 p. 1  Accès ouvert |
| Liens | Online - En ligne
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| Image |  |
| Année | 2010 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190176 |
| Éditeur | American Geophysical Union |
| Réunion | American Geophysical Union 2010 Fall Annual Meeting; San Francisco, CA; US; décembre 13-17, 2010 |
| Document | publication en série |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | html; pdf (Adobe® Reader®) |
| Programme | Délimitation du plateau continental du Canada en vertu de la Convention des Nations Unies sur le droit de la mer (UNCLOS) |
| Diffusé | 2010 12 01 |
| Résumé | (disponible en anglais seulement)
During the last several years new bathymetric, seismic reflection and refraction profiles have been collected on the Lomonosov Ridge, a feature whose
bathymetric expression is 1700 km long and 50-200 km across. Compiling of data from various organizations provides a more complete data base for describing and interpreting the geological history of this unique ridge that crossed the Arctic Ocean
from the continental margin of North America (north of Ellesmere Island and Greenland) to the continental margin of Russia creating the Eurasia and Amerasia basins. The Lomonosov Ridge has been described as a double-sided continental margin. Although
the conjugate margin on the Eurasia Basin is accepted to be the margin of the Barents and Kara seas, that on the Amerasia Basin side is more difficult to locate. Near the junction of the Ridge with the North American continental margin, new
bathymetric data more accurately describe the transition and the variation in slopes on either side of the ridge. On the Eurasia Basin rifted margin, conjugate to the margin of the Barents Sea, many small elongate highs are seen that are not observed
on the Amerasia side. The wide plateau on the Lomonosov Ridge near the North American margin has been crossed by short reflection profiles and longer deep refraction profiles. The crustal structure and magnetic signature suggest that the plateau has
been altered by igneous intrusion. Between the Pole and the North American margin, based on the magnetic character and supported by a few seismic profiles the continental ridge seems to have been modified by volcanism. This is consistent with the
distribution of the High Arctic large igneous province (HALIP) from Franz Josef Land, Svalbard and Greenland (on the conjugate margin prior to rifting) and in the Canadian Arctic Archipelago. The HALIP has a number of radiating dykes that are useful
is for the reconstruction of the region prior to sea floor spreading. From the Pole to the Siberian margin of the Lomonosov Ridge the magnetic signature weakens. Drilling and more numerous seismic reflection profiles are available here due to the
lighter ice conditions. The Ridge near the Pole appears as a single block that splinters into a number of bathymetric highs towards the Russian margin. Based on gravity and seismic reflection profiles the broadening and splintering of the feature is
even more extensive. The variations in character along the Ridge are consistent with its length and the circum Arctic geology. |
| GEOSCAN ID | 315336 |
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