Madeleine Skov Nygaard

• Nygaard, Madeleine Skov; Planke, Sverre; Zastrozhnov, Dmitry; Midtkandal, Ivar; Huismans, Ritske Sipke & Faleide, Jan Inge [Show all 13 contributors for this article] (2025). A tectonostratigraphic interpretation of the Mimir High through seismic-borehole tie: New insights into the Paleogene evolution of the Vøring Transform Margin. SEG technical program expanded abstracts. doi: 10.1190/image2025-4307795.1. Full text in Research Archive Show summary

  The Mimir High is a structural high along the Vøring Transform Margin (VTM), offshore Mid-Norway, having excellent coverage of high-resolution seismic 2D and 3D data and borehole data from five wells drilled during the International Ocean Discovery Program (IODP) Expedition 396. The Mimir High developed through rift tectonics and thermal uplift that resulted in a transition through different paleoenvironments from shallow marine to coastal or subaerial and finally marine again.

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• Planke, Sverre; Bünz, Stefan; Berndt, Christian; Zarikian, Carlos A. Alvarez; Lebedeva-Ivanova, Nina N. & Stokke, Henrik Henriksen [Show all 18 contributors for this article] (2025). The Ocean-Continent Transition of the Northern Vøring Margin from New High-Resolution 2D Seismic and IODP Expedition 396 Data. Full text in Research Archive
• Bünz, Stefan; Planke, Sverre; Berndt, Christian; Lebedeva-Ivanova, Nina N.; Stokke, Henrik Henriksen & Binde, Cornelia Mentzoni [Show all 14 contributors for this article] (2025). High-resolution 3D seismic imaging of Northeast Atlantic volcanic break‐up processes. doi: https:/www.geologi.no/konferanser/vinterkonferanser/abstracts/file/298-abst-vk25. Full text in Research Archive Show summary

  During the NE Atlantic breakup in the Paleogene, extensive magmatic activity resulted in the formation of approximately 6–10 Mkm3 of extrusive basaltic deposits and intrusion of magma into sedimentary basins. This magmatism, along with the degassing and explosive release of thermo‐ genic gases due to contact metamorphism, has been linked to the onset of the Paleocene‐Eocene Thermal Maximum (PETM; 56 Ma). During IODP Expedition 396, 21 boreholes were drilled at 10 sites across five geological settings on the mid‐ Norwegian Margin. These sites sampled diverse igneous and sedimentary environments, including lava flow fields, hydrothermal vent complexes (HTVCs), and thick Paleogene strata. In addition, UiT The Arctic University of Norway conducted three research expeditions in 2020, 2022 and 2024 to acquire high‐resolution 2D/3D seismic and multibeam data in order to tie IODP borehole sites together and to regional geology. This presentation focusses on the two high‐resolution 3D seismic surveys, one of which that was repeated during the 2024 expedition to study repeatability effects in basalts. A high‐resolution P‐Cable 3D seismic cube (10 by 2.4 km, 6.25x6.25 m bin size) was collected over the Modgunn Arch (Sites U1567 and U1568), where we have identified a shallowly buried HTVC, known as the Modgunn Vent, and associated sill intrusions. Contact metamorphism of sedimentary rocks generates volatile compounds, generating an overpressure that leads to fracturing of the overlying sediments. As the hot fluids and gases escape through the fractures, they reach the sea‐ floor and create HTVCs. These complexes consist of a large crater structure that is subsequently filled in by sediments some of which may result from erupted material. The vent fill may be alter‐ ed by fluid migration and/or tectonic stress leading to folding and doming. Another high‐resolution 3D seismic survey (10.3 x 1.8 km, 6.25x6.25 m bin size) was conducted on the Skoll High at the northern Vøring margin (Sites U1571 and U1572). The 3D seismic data images the top basalt showing the volcanic paleo‐land‐ scape in unprecedented details. A faulted and eroded lava horizon is observed in the southeast‐ ern cube at 150–250 m depth. In contrast, the northwestern cube shows a pitted surface with lobate structures and linear ridges. These features are interpreted as rootless cones, volcanic craters formed by explosive interactions between lava flows and water‐saturated sediments. This study showcases the exceptional level of detail achievable through high‐resolution 3D seis‐ mic data acquisition of hydrothermal vent complexes and buried volcanic landscapes, offering new opportunities for unique insights in the Northeast Atlantic break‐up processes and beyond

• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Show all 18 contributors for this article] (2025). Mimir High Core-log-seismic Integration. Full text in Research Archive
• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Show all 24 contributors for this article] (2024). PALMAR – Paleogene Basin Development on the Vøring and Møre Margins. Full text in Research Archive
• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Show all 24 contributors for this article] (2024). IODP Exp. 396 Drilling and High-Resolution 3D Seismic on the Mimir High. Full text in Research Archive
• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Show all 11 contributors for this article] (2024). Characterization of the Vøring Transform Margin by IODP Exp. 396 Drilling and High-Resolution 3D Seismic on the Mimir High. Full text in Research Archive
• Bünz, Stefan; Stokke, Henrik Henriksen; Lebedeva-Ivanova, Nina; Sokolkova, Elisaveta; Rohde, Lea & Nygaard, Madeleine Skov [Show all 13 contributors for this article] (2026). UiT-IG24-8 Cruise Report Leg 1 High-resolution 2D and 3D seismic investigations on the Vøring Margin. UiT Norges arktiske universitet. Full text in Research Archive Show summary

  This document reports on the acquisition and processing of the seismic, subbottom-profiling and multibeam data acquired during a cruise with UiT the Arctic University of Norway’s research vessel RV Helmer Hansen from 30th July to 15th August 2024. This expedition targeted areas in the northern half of the Vøring Basin and its margin towards the Lofoten Basin, where IODP Expedition 396 drilled at four sites in 2021 (Planke et al., 2023). In addition, we acquired multibeam and water-column data on an extended transit to Ålesund that covered several suspected fluid seepage sites. The seismic acquisition was conducted under the framework of cruise UiT-IG24-8 and NFR funded projects Paleogene Basin Development on the Vøring and Møre Margins (PALMAR, project number 336293) and Permanent sequestration of gigatons of CO2 in continental margin basalt deposits (PERBAS, project number 340832)

• Bünz, Stefan; Polteau, Stephane; Mazzini, Adriano; Ferré, Benedicte; Krueger, Martin & Trivedi, Akash [Show all 14 contributors for this article] (2026). UiT-IG25-7 Cruise Report. UiT Norges arktiske universitet. Full text in Research Archive

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