Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems
The Neogene–Quaternary development of the ∼700 km long mid-Norwegian and Lofoten–Vesterålen continental margin is reconstructed using a dense grid of 2D seismic data and exploration wellbores. Overall, widespread ocean current-controlled contourite drifts built up along the whole margin segment from...
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Language: | English |
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Elsevier
2022
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Online Access: | https://hdl.handle.net/10037/28062 https://doi.org/10.1016/j.margeo.2022.106974 |
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ftunivtroemsoe:oai:munin.uit.no:10037/28062 2023-05-15T17:08:15+02:00 Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems Olsen, Stine-Bjordal Rydningen, Tom Arne Laberg, Jan Sverre Lasabuda, Amando P. E. Knutsen, Stig Morten 2022-12-22 https://hdl.handle.net/10037/28062 https://doi.org/10.1016/j.margeo.2022.106974 eng eng Elsevier Marine Geology Equinor: Akademia Norges forskningsråd: 228107 Olsen SB, Rydningen TA, Laberg JS, Lasabuda AL, Knutsen S. Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems. Marine Geology. 2023;456 FRIDAID 2101200 doi:10.1016/j.margeo.2022.106974 0025-3227 1872-6151 https://hdl.handle.net/10037/28062 Attribution 4.0 International (CC BY 4.0) Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 CC-BY Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2022 ftunivtroemsoe https://doi.org/10.1016/j.margeo.2022.106974 2023-01-12T00:02:50Z The Neogene–Quaternary development of the ∼700 km long mid-Norwegian and Lofoten–Vesterålen continental margin is reconstructed using a dense grid of 2D seismic data and exploration wellbores. Overall, widespread ocean current-controlled contourite drifts built up along the whole margin segment from the mid-Miocene onwards (c. 11 Ma, Kai Formation). The onset (c. 8.8 Ma) of a large inner shelf progradation (Molo Formation) was, however, restricted to the southern part of the study area, the inner mid-Norwegian shelf. In the Quaternary (c. 2.7 Ma), grounded ice sheets repeatedly brought large sediment volumes (Naust Formation) to the shelf beyond the Molo Formation. A similar build-out is less pronounced further north, where contourite drift growth instead continued and resulted in build-up of the Lofoten and Vesterålen drifts. In contrast, the drifts of the southern part of the study area occur for the most part stratigraphically below, interbedded with and distal to the progradational Molo and Naust deposits. The study area exemplifies pronounced variability in Neogene–Quaternary continental margin growth. The wide and gently dipping mid-Norwegian margin facilitated coastal and shelf progradation related to fluvial and glacial processes, while the narrow and steep Lofoten–Vesterålen margin received little input from these sources although exposed to the same paleoclimate. Instead, erosion of canyons promoted downslope reworking across the slope and into the deep basins. This low sediment input is interpreted to be controlled by the alpine relief in the north resulting in a small source area and thus low fluvial and glacial sediment input. To the south, hinterland relief allowed for a much larger fluvial and later, glacial source area. Both margin segments were also influenced by contour currents throughout the studied period. We emphasize their importance for understanding the role of erosion and deposition in source-to-sink systems, and thus the need for these processes to be integrated within source-to-sink ... Article in Journal/Newspaper Lofoten North Norway Vesterålen University of Tromsø: Munin Open Research Archive Lofoten Norway Vesterålen ENVELOPE(14.939,14.939,68.754,68.754) Marine Geology 456 106974 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
The Neogene–Quaternary development of the ∼700 km long mid-Norwegian and Lofoten–Vesterålen continental margin is reconstructed using a dense grid of 2D seismic data and exploration wellbores. Overall, widespread ocean current-controlled contourite drifts built up along the whole margin segment from the mid-Miocene onwards (c. 11 Ma, Kai Formation). The onset (c. 8.8 Ma) of a large inner shelf progradation (Molo Formation) was, however, restricted to the southern part of the study area, the inner mid-Norwegian shelf. In the Quaternary (c. 2.7 Ma), grounded ice sheets repeatedly brought large sediment volumes (Naust Formation) to the shelf beyond the Molo Formation. A similar build-out is less pronounced further north, where contourite drift growth instead continued and resulted in build-up of the Lofoten and Vesterålen drifts. In contrast, the drifts of the southern part of the study area occur for the most part stratigraphically below, interbedded with and distal to the progradational Molo and Naust deposits. The study area exemplifies pronounced variability in Neogene–Quaternary continental margin growth. The wide and gently dipping mid-Norwegian margin facilitated coastal and shelf progradation related to fluvial and glacial processes, while the narrow and steep Lofoten–Vesterålen margin received little input from these sources although exposed to the same paleoclimate. Instead, erosion of canyons promoted downslope reworking across the slope and into the deep basins. This low sediment input is interpreted to be controlled by the alpine relief in the north resulting in a small source area and thus low fluvial and glacial sediment input. To the south, hinterland relief allowed for a much larger fluvial and later, glacial source area. Both margin segments were also influenced by contour currents throughout the studied period. We emphasize their importance for understanding the role of erosion and deposition in source-to-sink systems, and thus the need for these processes to be integrated within source-to-sink ... |
format |
Article in Journal/Newspaper |
author |
Olsen, Stine-Bjordal Rydningen, Tom Arne Laberg, Jan Sverre Lasabuda, Amando P. E. Knutsen, Stig Morten |
spellingShingle |
Olsen, Stine-Bjordal Rydningen, Tom Arne Laberg, Jan Sverre Lasabuda, Amando P. E. Knutsen, Stig Morten Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems |
author_facet |
Olsen, Stine-Bjordal Rydningen, Tom Arne Laberg, Jan Sverre Lasabuda, Amando P. E. Knutsen, Stig Morten |
author_sort |
Olsen, Stine-Bjordal |
title |
Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems |
title_short |
Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems |
title_full |
Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems |
title_fullStr |
Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems |
title_full_unstemmed |
Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems |
title_sort |
contrasting neogene–quaternary continental margin evolution offshore mid-north norway: implications for source-to-sink systems |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://hdl.handle.net/10037/28062 https://doi.org/10.1016/j.margeo.2022.106974 |
long_lat |
ENVELOPE(14.939,14.939,68.754,68.754) |
geographic |
Lofoten Norway Vesterålen |
geographic_facet |
Lofoten Norway Vesterålen |
genre |
Lofoten North Norway Vesterålen |
genre_facet |
Lofoten North Norway Vesterålen |
op_relation |
Marine Geology Equinor: Akademia Norges forskningsråd: 228107 Olsen SB, Rydningen TA, Laberg JS, Lasabuda AL, Knutsen S. Contrasting Neogene–Quaternary continental margin evolution offshore mid-north Norway: Implications for source-to-sink systems. Marine Geology. 2023;456 FRIDAID 2101200 doi:10.1016/j.margeo.2022.106974 0025-3227 1872-6151 https://hdl.handle.net/10037/28062 |
op_rights |
Attribution 4.0 International (CC BY 4.0) Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.margeo.2022.106974 |
container_title |
Marine Geology |
container_volume |
456 |
container_start_page |
106974 |
_version_ |
1766063959111106560 |