Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2017
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.878121 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867170076864544768 |
|---|---|
| author | Urlaub, Morelia Schmidt-Aursch, Mechita Jokat, Wilfried Kaul, Norbert |
| author_facet | Urlaub, Morelia Schmidt-Aursch, Mechita Jokat, Wilfried Kaul, Norbert |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_878121 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Heat flow data during POLARSTERN cruise ARK-XVII/2, AMORE expedition to the Gakkel Ridge, with links to raw data files Urlaub, Morelia Schmidt-Aursch, Mechita Jokat, Wilfried Kaul, Norbert ARK-XVII/2; Bottom water temperature; Conductivity, thermal; Date/Time of event; Depth, bathymetric; Depth, shift; Event label; File size; Gakkel Ridge, Arctic Ocean; Heat flow; Heat-Flow probe; HF; LATITUDE; LONGITUDE; Polarstern; PS59/207-1b; PS59/217-1b; PS59/219-3a; PS59/237-2a; PS59/245-1b; PS59/277b; PS59/279-1b; PS59/281-1; PS59/282-1; PS59/283-1b; PS59/284-1b; PS59/286; PS59/287-3a; PS59/287-4; PS59/288-1b; PS59/288-3; PS59/292-3; PS59/298; PS59/308-1; PS59 AMORE; Station label; Temperature gradient; Uniform resource locator/link to raw data file 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%. |
| title | Heat flow data during POLARSTERN cruise ARK-XVII/2, AMORE expedition to the Gakkel Ridge, with links to raw data files |
| topic | ARK-XVII/2; Bottom water temperature; Conductivity, thermal; Date/Time of event; Depth, bathymetric; Depth, shift; Event label; File size; Gakkel Ridge, Arctic Ocean; Heat flow; Heat-Flow probe; HF; LATITUDE; LONGITUDE; Polarstern; PS59/207-1b; PS59/217-1b; PS59/219-3a; PS59/237-2a; PS59/245-1b; PS59/277b; PS59/279-1b; PS59/281-1; PS59/282-1; PS59/283-1b; PS59/284-1b; PS59/286; PS59/287-3a; PS59/287-4; PS59/288-1b; PS59/288-3; PS59/292-3; PS59/298; PS59/308-1; PS59 AMORE; Station label; Temperature gradient; Uniform resource locator/link to raw data file |
| url | https://doi.org/10.1594/PANGAEA.878121 |