Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean
The Gakkel Ridge in the Arctic Ocean with its adjacent Nansen and Amundsen Basins is a key region for the study of mantle melting and crustal generation at ultraslow spreading rates. We use free-air gravity anomalies in combination with seismic reflection and wide-angle data to compute 2-D crustal m...
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ftoceanrep:oai:oceanrep.geomar.de:25573 2023-05-15T14:25:44+02:00 Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean Urlaub, Morelia Schmidt-Aursch, Mechita Jokat, Wilfried Kaul, Norbert 2009 https://oceanrep.geomar.de/id/eprint/25573/ https://doi.org/10.1007/s11001-010-9093-x unknown Springer Urlaub, M. , Schmidt-Aursch, M., Jokat, W. and Kaul, N. (2009) Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean. Marine Geophysical Researches, 30 (4). pp. 277-292. DOI 10.1007/s11001-010-9093-x <https://doi.org/10.1007/s11001-010-9093-x>. doi:10.1007/s11001-010-9093-x Article PeerReviewed 2009 ftoceanrep https://doi.org/10.1007/s11001-010-9093-x 2023-04-07T15:14:15Z The Gakkel Ridge in the Arctic Ocean with its adjacent Nansen and Amundsen Basins is a key region for the study of mantle melting and crustal generation at ultraslow spreading rates. We use free-air gravity anomalies in combination with seismic reflection and wide-angle data to compute 2-D crustal models for the Nansen and Amundsen Basins in the Arctic Ocean. Despite the permanent pack-ice cover two geophysical transects cross both entire basins. This means that the complete basin geometry of the world’s slowest spreading system can be analysed in detail for the first time. Applying standard densities for the sediments and oceanic crystalline crust, the gravity models reveal an unexpected heterogeneous mantle with densities of 3.30 × 103, 3.20 × 103 and 3.10 × 103 kg/m3 near the Gakkel Ridge. We interpret that the upper mantle heterogeneity mainly results from serpentinisation and thermal effects. The thickness of the oceanic crust is highly variable throughout both transects. Crustal thickness of less than 1 km dominates in the oldest parts of both basins, increasing to a maximum value of 6 km near the Gakkel Ridge. Along-axis heat flow is highly variable and heat flow amplitudes resemble those observed at fast or intermediate spreading ridges. Unexpectedly, high heat flow along the Amundsen transect exceeds predicted values from global cooling curves by more than 100%. Article in Journal/Newspaper Arctic Arctic Arctic Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Eurasia Basin ENVELOPE(80.000,80.000,87.000,87.000) Gakkel Ridge ENVELOPE(90.000,90.000,87.000,87.000) Marine Geophysical Researches 30 4 277 292 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
unknown |
description |
The Gakkel Ridge in the Arctic Ocean with its adjacent Nansen and Amundsen Basins is a key region for the study of mantle melting and crustal generation at ultraslow spreading rates. We use free-air gravity anomalies in combination with seismic reflection and wide-angle data to compute 2-D crustal models for the Nansen and Amundsen Basins in the Arctic Ocean. Despite the permanent pack-ice cover two geophysical transects cross both entire basins. This means that the complete basin geometry of the world’s slowest spreading system can be analysed in detail for the first time. Applying standard densities for the sediments and oceanic crystalline crust, the gravity models reveal an unexpected heterogeneous mantle with densities of 3.30 × 103, 3.20 × 103 and 3.10 × 103 kg/m3 near the Gakkel Ridge. We interpret that the upper mantle heterogeneity mainly results from serpentinisation and thermal effects. The thickness of the oceanic crust is highly variable throughout both transects. Crustal thickness of less than 1 km dominates in the oldest parts of both basins, increasing to a maximum value of 6 km near the Gakkel Ridge. Along-axis heat flow is highly variable and heat flow amplitudes resemble those observed at fast or intermediate spreading ridges. Unexpectedly, high heat flow along the Amundsen transect exceeds predicted values from global cooling curves by more than 100%. |
format |
Article in Journal/Newspaper |
author |
Urlaub, Morelia Schmidt-Aursch, Mechita Jokat, Wilfried Kaul, Norbert |
spellingShingle |
Urlaub, Morelia Schmidt-Aursch, Mechita Jokat, Wilfried Kaul, Norbert Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean |
author_facet |
Urlaub, Morelia Schmidt-Aursch, Mechita Jokat, Wilfried Kaul, Norbert |
author_sort |
Urlaub, Morelia |
title |
Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean |
title_short |
Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean |
title_full |
Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean |
title_fullStr |
Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean |
title_full_unstemmed |
Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean |
title_sort |
gravity crustal models and heat flow measurements for the eurasia basin, arctic ocean |
publisher |
Springer |
publishDate |
2009 |
url |
https://oceanrep.geomar.de/id/eprint/25573/ https://doi.org/10.1007/s11001-010-9093-x |
long_lat |
ENVELOPE(80.000,80.000,87.000,87.000) ENVELOPE(90.000,90.000,87.000,87.000) |
geographic |
Arctic Arctic Ocean Eurasia Basin Gakkel Ridge |
geographic_facet |
Arctic Arctic Ocean Eurasia Basin Gakkel Ridge |
genre |
Arctic Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Arctic Ocean |
op_relation |
Urlaub, M. , Schmidt-Aursch, M., Jokat, W. and Kaul, N. (2009) Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean. Marine Geophysical Researches, 30 (4). pp. 277-292. DOI 10.1007/s11001-010-9093-x <https://doi.org/10.1007/s11001-010-9093-x>. doi:10.1007/s11001-010-9093-x |
op_doi |
https://doi.org/10.1007/s11001-010-9093-x |
container_title |
Marine Geophysical Researches |
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30 |
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4 |
container_start_page |
277 |
op_container_end_page |
292 |
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1766298204562784256 |