Crustal structures along the East Greenland margin
The margin off North-East Greenland between 69°N and 79°N, respectively Scoresby Sund and Boreas Basin, is less well known than the conjugate margin off Norway. The sparse geophysical and geological database of the North-East Greenland margin reveals strong lateral and vertical variations in crustal...
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ftawi:oai:epic.awi.de:30766 2023-05-15T16:03:27+02:00 Crustal structures along the East Greenland margin Hermann, Tobias Jokat, Wilfried 2012-09-17 https://epic.awi.de/id/eprint/30766/ https://hdl.handle.net/10013/epic.40027 unknown Hermann, T. and Jokat, W. orcid:0000-0002-7793-5854 (2012) Crustal structures along the East Greenland margin , Seismix 2012 - The 15th International Symposium on „Deep Seismic Profiling of the Continents and their Margins“, Beijing, China, 16 September 2012 - 20 September 2012 . hdl:10013/epic.40027 EPIC3Seismix 2012 - The 15th International Symposium on „Deep Seismic Profiling of the Continents and their Margins“, Beijing, China, 2012-09-16-2012-09-20Geophysical Journal International, ISSN: 0956-540X Conference notRev 2012 ftawi 2021-12-24T15:37:49Z The margin off North-East Greenland between 69°N and 79°N, respectively Scoresby Sund and Boreas Basin, is less well known than the conjugate margin off Norway. The sparse geophysical and geological database of the North-East Greenland margin reveals strong lateral and vertical variations in crustal structure due to the complex rifting history. The crustal structure of the North-East Greenland margin is of special interest for a better understanding of the rifting processes in general, and their variations along the continental margin. Therefore, in summer 2009 deep seismic data were acquired along two profiles in the Norwegian-Greenland Sea: (1) in the Boreas Basin between the Knipovich Ridge and North-East Greenland margin, and (2) in prolongation of an existing crustal transect in the Kong Oscar Fjord (KOF) to the Kolbeinsey Ridge. The two seismic refraction lines show differences in the oceanic crustal structure. At the Knipovich Ridge the crustal thickness is only ~3 km compared to ~10 km at the Kolbeinsey Ridge. The oceanic crustal structure of the Boreas Basin reveals no significant oceanic layer 3 contrasted to normal oceanic structure at the Kolbeinsey Ridge. The upper mantle velocities of the Boreas Basin indicate small lateral variations with an averaged value of 7.5 km/s. In contrast, the upper mantle velocities of oceanic part of the KOF profile emerge considerable lateral variations in range of 7.6-7.9 km/s. These crustal differences indicate northward decreasing of the magmatic influence during the formation of the Norwegian-Greenland Sea. Conference Object East Greenland Greenland Greenland Sea Kolbeinsey Kong Oscar fjord Scoresby Sund Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland Norway Sund ENVELOPE(13.644,13.644,66.207,66.207) Scoresby ENVELOPE(162.750,162.750,-66.567,-66.567) Scoresby Sund ENVELOPE(-24.387,-24.387,70.476,70.476) Kolbeinsey ENVELOPE(-18.687,-18.687,67.149,67.149) Kolbeinsey Ridge ENVELOPE(-16.917,-16.917,68.833,68.833) Boreas ENVELOPE(-3.933,-3.933,-71.300,-71.300) Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Kong Oscar Fjord ENVELOPE(-23.935,-23.935,72.361,72.361) Boreas Basin ENVELOPE(1.000,1.000,77.500,77.500) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The margin off North-East Greenland between 69°N and 79°N, respectively Scoresby Sund and Boreas Basin, is less well known than the conjugate margin off Norway. The sparse geophysical and geological database of the North-East Greenland margin reveals strong lateral and vertical variations in crustal structure due to the complex rifting history. The crustal structure of the North-East Greenland margin is of special interest for a better understanding of the rifting processes in general, and their variations along the continental margin. Therefore, in summer 2009 deep seismic data were acquired along two profiles in the Norwegian-Greenland Sea: (1) in the Boreas Basin between the Knipovich Ridge and North-East Greenland margin, and (2) in prolongation of an existing crustal transect in the Kong Oscar Fjord (KOF) to the Kolbeinsey Ridge. The two seismic refraction lines show differences in the oceanic crustal structure. At the Knipovich Ridge the crustal thickness is only ~3 km compared to ~10 km at the Kolbeinsey Ridge. The oceanic crustal structure of the Boreas Basin reveals no significant oceanic layer 3 contrasted to normal oceanic structure at the Kolbeinsey Ridge. The upper mantle velocities of the Boreas Basin indicate small lateral variations with an averaged value of 7.5 km/s. In contrast, the upper mantle velocities of oceanic part of the KOF profile emerge considerable lateral variations in range of 7.6-7.9 km/s. These crustal differences indicate northward decreasing of the magmatic influence during the formation of the Norwegian-Greenland Sea. |
format |
Conference Object |
author |
Hermann, Tobias Jokat, Wilfried |
spellingShingle |
Hermann, Tobias Jokat, Wilfried Crustal structures along the East Greenland margin |
author_facet |
Hermann, Tobias Jokat, Wilfried |
author_sort |
Hermann, Tobias |
title |
Crustal structures along the East Greenland margin |
title_short |
Crustal structures along the East Greenland margin |
title_full |
Crustal structures along the East Greenland margin |
title_fullStr |
Crustal structures along the East Greenland margin |
title_full_unstemmed |
Crustal structures along the East Greenland margin |
title_sort |
crustal structures along the east greenland margin |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/30766/ https://hdl.handle.net/10013/epic.40027 |
long_lat |
ENVELOPE(13.644,13.644,66.207,66.207) ENVELOPE(162.750,162.750,-66.567,-66.567) ENVELOPE(-24.387,-24.387,70.476,70.476) ENVELOPE(-18.687,-18.687,67.149,67.149) ENVELOPE(-16.917,-16.917,68.833,68.833) ENVELOPE(-3.933,-3.933,-71.300,-71.300) ENVELOPE(7.074,7.074,75.712,75.712) ENVELOPE(-23.935,-23.935,72.361,72.361) ENVELOPE(1.000,1.000,77.500,77.500) |
geographic |
Greenland Norway Sund Scoresby Scoresby Sund Kolbeinsey Kolbeinsey Ridge Boreas Knipovich Ridge Kong Oscar Fjord Boreas Basin |
geographic_facet |
Greenland Norway Sund Scoresby Scoresby Sund Kolbeinsey Kolbeinsey Ridge Boreas Knipovich Ridge Kong Oscar Fjord Boreas Basin |
genre |
East Greenland Greenland Greenland Sea Kolbeinsey Kong Oscar fjord Scoresby Sund |
genre_facet |
East Greenland Greenland Greenland Sea Kolbeinsey Kong Oscar fjord Scoresby Sund |
op_source |
EPIC3Seismix 2012 - The 15th International Symposium on „Deep Seismic Profiling of the Continents and their Margins“, Beijing, China, 2012-09-16-2012-09-20Geophysical Journal International, ISSN: 0956-540X |
op_relation |
Hermann, T. and Jokat, W. orcid:0000-0002-7793-5854 (2012) Crustal structures along the East Greenland margin , Seismix 2012 - The 15th International Symposium on „Deep Seismic Profiling of the Continents and their Margins“, Beijing, China, 16 September 2012 - 20 September 2012 . hdl:10013/epic.40027 |
_version_ |
1766399110965886976 |