Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods
Interest for the polar regions has increased during the last few decades. New technologies now allow to conduct research in this hostile environment. Tectonic history and timing of the opening of the Arctic is the key to understand the geological framework of this area. Climate and environmental res...
Published in: | Geophysical Journal International |
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Main Author: | |
Other Authors: | , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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NTNU
2021
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Online Access: | https://hdl.handle.net/11250/2977180 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2977180 |
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Open Polar |
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NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
VDP::Technology: 500::Rock and petroleum disciplines: 510::Petroleum engineering: 512 |
spellingShingle |
VDP::Technology: 500::Rock and petroleum disciplines: 510::Petroleum engineering: 512 Dumais, Marie-Andrée Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods |
topic_facet |
VDP::Technology: 500::Rock and petroleum disciplines: 510::Petroleum engineering: 512 |
description |
Interest for the polar regions has increased during the last few decades. New technologies now allow to conduct research in this hostile environment. Tectonic history and timing of the opening of the Arctic is the key to understand the geological framework of this area. Climate and environmental research necessitate a deeper understanding of the polar regions to model the global ecosystem and create robust global weather and climate change prediction scenarios. In this work, we addressed the Norwegian Polar Regions by studying the spreading of the Knipovich Ridge, the regional tectonic of the Fram Strait and the Svalbard Margin, the thermal activity and fluid circulation of Loki’s Castle and its surroundings, and the bed topography and geology under Austfonna icecap. All these facets of the Norwegian Polar Regions have been investigated with a common methodology: potential fields theory. We developed tools to recognize the underground settings of various types of environment at different scale within the Norwegian Arctic. The data interpretation and analysis are mainly based on 2-D forward modelling, 3-D inversion modelling, Werner deconvolution and plate tectonic reconstruction. Newly acquired aeromagnetic data revealed several fracture zones and lineaments in the Fram Strait. The high-resolution data identified the magnetic isochrons of the Knipovich Ridge. The ridge spreading initiated at C6 (20 Ma) and a ridge jump occurred at C5E. The 2-D magnetic and gravity forward modelling interpreted the crustal and thermal heterogeneities of the Fram Strait and Svalbard Margin. The crustal domains were consequently delineated and confirmed with the Werner deconvolution and Curie point depth estimation. The 3-D magnetic inversion modelling identified zone with weak magnetization along the rift valley correlated with the absence of volcanic and bathymetric rise evidence. The continent-ocean boundary on the east margin is relocated up to 160 km west of the location set by previous studies. With an autonomous underwater ... |
author2 |
Brönner, Marco Smelror, Morten Johansen, Ståle Emil |
format |
Doctoral or Postdoctoral Thesis |
author |
Dumais, Marie-Andrée |
author_facet |
Dumais, Marie-Andrée |
author_sort |
Dumais, Marie-Andrée |
title |
Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods |
title_short |
Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods |
title_full |
Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods |
title_fullStr |
Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods |
title_full_unstemmed |
Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods |
title_sort |
regional tectonic and environmental assessments of the norwegian polar regions using potential field methods |
publisher |
NTNU |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2977180 |
long_lat |
ENVELOPE(24.559,24.559,79.835,79.835) ENVELOPE(-63.483,-63.483,-64.833,-64.833) ENVELOPE(7.074,7.074,75.712,75.712) |
geographic |
Arctic Austfonna Curie Point Knipovich Ridge Svalbard |
geographic_facet |
Arctic Austfonna Curie Point Knipovich Ridge Svalbard |
genre |
Arctic Austfonna Climate change Fram Strait Svalbard Svalbard margin The Cryosphere |
genre_facet |
Arctic Austfonna Climate change Fram Strait Svalbard Svalbard margin The Cryosphere |
op_relation |
Doctoral theses at NTNU;2021:421 Dumais, Marie-Andrée; Gernigon, Laurent; Olesen, Odleiv; Johansen, Ståle Emil; Brönner, Marco. New interpretation of the spreading evolution of the Knipovich Ridge derived from aeromagnetic data. Geophysical Journal International 2021 ;Volum 224.(2) s. 1422-1428 https://doi.org/10.1093/gji/ggaa527 - This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) Crustal and Thermal Heterogeneities Across the Fram Strait and the Svalbard Margin. The final published version is available in Tectonics Volume41, Issue10, 2022 https://doi.org/10.1029/2022TC007302 - This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0) Lim, Anna; Brönner, Marco; Johansen, Ståle Emil; Dumais, Marie-Andrée. Hydrothermal activity at the ultraslow‐spreading Mohns Ridge: new insights from near‐seafloor magnetics. Geochemistry Geophysics Geosystems 2019 ;Volum 20.(12) s. 5691-5709 https://doi.org/10.1029/2019GC008439 - This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0) Dumais, Marie-Andrée; Brönner, Marco. Revisiting Austfonna, Svalbard, with potential field methods - A new characterization of the bed topography and its physical properties. The Cryosphere 2020 ;Volum 14. s. 183-197 https://doi.org/10.5194/tc-14-183-2020 - This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0) urn:isbn:978-82-326-6312-5 urn:issn:2703-8084 https://hdl.handle.net/11250/2977180 |
op_doi |
https://doi.org/10.1093/gji/ggaa527 https://doi.org/10.1029/2022TC007302 https://doi.org/10.1029/2019GC008439 https://doi.org/10.5194/tc-14-183-2020 |
container_title |
Geophysical Journal International |
container_volume |
224 |
container_issue |
2 |
container_start_page |
1422 |
op_container_end_page |
1428 |
_version_ |
1766334109740695552 |
spelling |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2977180 2023-05-15T15:02:07+02:00 Regional Tectonic and Environmental Assessments of the Norwegian Polar Regions using Potential Field Methods Dumais, Marie-Andrée Brönner, Marco Smelror, Morten Johansen, Ståle Emil 2021 application/pdf https://hdl.handle.net/11250/2977180 eng eng NTNU Doctoral theses at NTNU;2021:421 Dumais, Marie-Andrée; Gernigon, Laurent; Olesen, Odleiv; Johansen, Ståle Emil; Brönner, Marco. New interpretation of the spreading evolution of the Knipovich Ridge derived from aeromagnetic data. Geophysical Journal International 2021 ;Volum 224.(2) s. 1422-1428 https://doi.org/10.1093/gji/ggaa527 - This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) Crustal and Thermal Heterogeneities Across the Fram Strait and the Svalbard Margin. The final published version is available in Tectonics Volume41, Issue10, 2022 https://doi.org/10.1029/2022TC007302 - This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0) Lim, Anna; Brönner, Marco; Johansen, Ståle Emil; Dumais, Marie-Andrée. Hydrothermal activity at the ultraslow‐spreading Mohns Ridge: new insights from near‐seafloor magnetics. Geochemistry Geophysics Geosystems 2019 ;Volum 20.(12) s. 5691-5709 https://doi.org/10.1029/2019GC008439 - This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0) Dumais, Marie-Andrée; Brönner, Marco. Revisiting Austfonna, Svalbard, with potential field methods - A new characterization of the bed topography and its physical properties. The Cryosphere 2020 ;Volum 14. s. 183-197 https://doi.org/10.5194/tc-14-183-2020 - This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0) urn:isbn:978-82-326-6312-5 urn:issn:2703-8084 https://hdl.handle.net/11250/2977180 VDP::Technology: 500::Rock and petroleum disciplines: 510::Petroleum engineering: 512 Doctoral thesis 2021 ftntnutrondheimi https://doi.org/10.1093/gji/ggaa527 https://doi.org/10.1029/2022TC007302 https://doi.org/10.1029/2019GC008439 https://doi.org/10.5194/tc-14-183-2020 2022-10-19T22:41:49Z Interest for the polar regions has increased during the last few decades. New technologies now allow to conduct research in this hostile environment. Tectonic history and timing of the opening of the Arctic is the key to understand the geological framework of this area. Climate and environmental research necessitate a deeper understanding of the polar regions to model the global ecosystem and create robust global weather and climate change prediction scenarios. In this work, we addressed the Norwegian Polar Regions by studying the spreading of the Knipovich Ridge, the regional tectonic of the Fram Strait and the Svalbard Margin, the thermal activity and fluid circulation of Loki’s Castle and its surroundings, and the bed topography and geology under Austfonna icecap. All these facets of the Norwegian Polar Regions have been investigated with a common methodology: potential fields theory. We developed tools to recognize the underground settings of various types of environment at different scale within the Norwegian Arctic. The data interpretation and analysis are mainly based on 2-D forward modelling, 3-D inversion modelling, Werner deconvolution and plate tectonic reconstruction. Newly acquired aeromagnetic data revealed several fracture zones and lineaments in the Fram Strait. The high-resolution data identified the magnetic isochrons of the Knipovich Ridge. The ridge spreading initiated at C6 (20 Ma) and a ridge jump occurred at C5E. The 2-D magnetic and gravity forward modelling interpreted the crustal and thermal heterogeneities of the Fram Strait and Svalbard Margin. The crustal domains were consequently delineated and confirmed with the Werner deconvolution and Curie point depth estimation. The 3-D magnetic inversion modelling identified zone with weak magnetization along the rift valley correlated with the absence of volcanic and bathymetric rise evidence. The continent-ocean boundary on the east margin is relocated up to 160 km west of the location set by previous studies. With an autonomous underwater ... Doctoral or Postdoctoral Thesis Arctic Austfonna Climate change Fram Strait Svalbard Svalbard margin The Cryosphere NTNU Open Archive (Norwegian University of Science and Technology) Arctic Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Curie Point ENVELOPE(-63.483,-63.483,-64.833,-64.833) Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Svalbard Geophysical Journal International 224 2 1422 1428 |