Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001geoji.145..505w&link_type=abstract
Geophysical Journal International, Volume 145, Issue 2, pp. 505-516.
Physics
9
Scientific paper
The Gakkel Ridge, northern boundary of the American and Eurasian plates, has the slowest spreading rate of the global ridge system. Therefore, it provides an excellent opportunity to study any dependence of crustal fabric on spreading rate. Two parameters, crustal surface roughness and crustal thickness, at the super-slow-spreading Gakkel Ridge (<20mmyr-1 full rate) are the subject of the following study. Seismic and gravity data acquired across the Gakkel Ridge and the adjacent Nansen and Amundsen basins during the ARCTIC'91 expedition are used. The surface of the basement, imaged along the seismic multichannel profiles, is very rough and varies in its topography from several hundreds of metres up to 1000m. Its RMS-roughness ranges from 450m in the central Amundsen Basin to 584m in the southern Eurasian Basin. These values agree reasonably well with RMS-roughness values derived by an empirical model from spreading rates. The gravity models reveal a 5-6km thick oceanic crust (density of 2900kgm-3) in the central part of the Amundsen Basin, increasing to 9km towards the Gakkel Ridge. At the southwestern end of the Eurasian Basin, the oceanic crust is only 2-5km thick and thickens towards the Gakkel Ridge. In our model the ridge is composed of a 2km thick upper layer with a density of 2600kgm-3, underlain by an 8km thick zone with a density of 2900kgm-3. The increase of crustal thickness does not confirm theoretical models for the relation between spreading rate and crustal thickness. The results indicate that the super-slow spreading rate of the Gakkel Ridge may have caused lateral variations in the crustal thickness of the Eurasian Basin.
Jokat Wilfried
Weigelt Estella
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