PALMAR Paleogen bassengutvikling på Vøring- og Møremarginene

• Senger, Kim; Ammerlaan, Fenna; Betlem, Peter; Gaina, Carmen; Galland, Olivier & Grundvåg, Sten-Andreas [Vis alle 21 forfattere av denne artikkelen] (2026). A Field Guide to the High Arctic Large Igneous Province in and Around Isfjorden, Svalbard. Tektonika. 3(2), s. 176–216. doi: https:/tektonika.online/index.php/home/article/view/124/197. Fulltekst i vitenarkiv Vis sammendrag

  The High Arctic Large Igneous Province (HALIP) is a major tectono-magmatic element that affected large parts of the Arctic during the Cretaceous (magmatism occurred from 126 to 78 million years ago [Ma]). In Svalbard, HALIP intrusive and extrusive rocks are grouped and classified as the Diabasodden Suite. Sills and dykes are present throughout Svalbard, emplaced in units stratigraphically ranging from crystalline basement to Jurassic-Cretaceous siliciclastics. Time-equivalent lava flows are exposed on Kong Karls Land in eastern Svalbard. In this contribution, we firstly define and introduce major features of the circum-Arctic HALIP. Secondly, we zoom into Svalbard where we document and summarize the attributes of HALIP outcrops (i.e., the Diabasodden Suite) located in and around Isfjorden, the most accessible location that is reachable on day trips using boats from Longyearbyen. For each of the 15 sites we focus on specific aspects of HALIP characterization, including geochronology, geochemistry and geometry of volcanic and intrusive rocks. We complement field descriptions of the sites with digital geoscientific data, including digital outcrop models and photospheres. Finally, we synthesize the Isfjorden study area in the context of data and knowledge gaps for the HALIP in general. We hope that this contribution will stimulate further HALIP research in Isfjorden and beyond.

• Telmon, Maria; Grundvåg, Sten-Andreas; Senger, Kim; Planke, Sverre; Horota, Rafael Kenji & Betlem, Peter [Vis alle 12 forfattere av denne artikkelen] (2026). Miocene flood basalts in NW Spitsbergen: Emplacement environment and Arctic paleoclimate context. Journal of Volcanology and Geothermal Research. ISSN 0377-0273. 479. doi: 10.1016/j.jvolgeores.2026.108724. Fulltekst i vitenarkiv Vis sammendrag

  Large parts of the Arctic, including Svalbard, have experienced recurrent episodes of uplift and erosion over the last 15–20 million years, coinciding with localized magmatism and seafloor spreading. This has left sparse onshore stratigraphic records of the Miocene period, limiting our understanding of the tectono-sedimentary and paleo-landscape evolution across this vast region. The volcanic Seidfjellet Formation in northwestern Spitsbergen thus provides a rare e onshore Miocene record. To determine emplacement mechanisms, volcanic architecture, and the pre-volcanic paleoenvironment, we combined detailed field-based facies analysis with digital outcrop models, thin-section petrography, and palynology. We document 10–20 basaltic lava flows, totaling ~400 m in cumulative thickness, now exposed at 600–1350 m elevation. The lava sequence rests on a gently undulating Devonian peneplane that locally is incised by several-hundred-meters-wide, up to 150-m-deep depressions interpreted as paleo-valleys. These valleys likely formed by stream rejuvenation associated with Miocene peneplane uplift. At valley bases we report previously unrecognized pockets of unconsolidated sediment, evidence of pre-volcanic sedimentation. Valley margins are locally draped by volcaniclastic deposits that contain in-situ charcoal-lined tree molds, indicating forested margins before eruption. The main valley fills are hyaloclastite deposits up to 150 m thick, arranged in steeply dipping forests that record southward progradation of a lava-fed delta after base-level rise and drowning of the valleys. Palynological data indicate a conifer-dominated wetland prior to lava emplacement, while the dinocyst assemblages appear partly reworked and are consistent with a Late Oligocene–Early Miocene signal but more likely reflect a Late Miocene age. This study provides the first systematic description of the Seidfjellet Formation volcanic facies and architecture, constrains its spatial extent, and, through its pre-volcanic sedimentary records, offers new paleoenvironmental reconstructions. Finally, our findings highlight the interplay between magmatism and uplift during Svalbard’s Miocene evolution

• Rosenqvist, Marija Plahter; Dunkel, Kristina; Nogueira, Liebert Parreiras; Planke, Sverre; Polteau, Stephane & Ardit, M. [Vis alle 8 forfattere av denne artikkelen] (2026). Natural CO<inf>2</inf>sequestration: mechanisms and conditions of carbonate precipitation in basalt. Geochimica et Cosmochimica Acta. ISSN 0016-7037. 427, s. 381–402. doi: 10.1016/j.gca.2026.07.013. Fulltekst i vitenarkiv
• Minakov, Alexander; Kämpf, Horst; Varılsüha, Deniz; Senger, Kim; Smirnov, Maxim & Niedermann, Samuel [Vis alle 16 forfattere av denne artikkelen] (2026). Structure and Origin of an Active Hydrothermal System in NW Svalbard: A Combined Magnetotelluric and Gas‐Water Isotope Study. Journal of Geophysical Research (JGR): Solid Earth. ISSN 2169-9313. 131(7). doi: 10.1029/2025jb033374. Fulltekst i vitenarkiv Vis sammendrag

  The Woodfjorden area in northwestern Svalbard hosts the world's northernmost onshore thermal springs, extinct Quaternary volcanoes (the Bockfjorden Volcanic Complex), late Miocene lava flows (the Seidfjellet Formation) that overlie a Devonian sedimentary basin, and a long‐lived regional fault zone. To contribute to a better understanding of subsurface fluid flow in this volcanic region, we conducted a 3D magnetotelluric (MT) survey at 12 sites, combined with water and gas sampling at the thermal spring clusters (Trollkjeldene and Jotunkjeldene). While the MT survey has a limited aperture due to the remoteness of the region and complex logistics, the identified structural features put several constraints on the evolution of this poorly studied hydrothermal system. The electrically conductive zones (1–10 m), under Trollkjeldene and the Halvdanpiggen volcanic center, are interpreted as signatures of deep hydrothermal fluids or mineralized zones; the resistive anomalies (1–10 km) at 1–4 km depth under the Sverrefjllet volcano indicate buried magmatic or basement rocks. Stable isotope data indicate both meteoric and crustal components for thermal waters. Carbon and noble gas isotope ratios support a mixed gas source involving crustal, atmospheric, and mantle components. Helium isotope ratios suggest a mantle‐derived fraction of 6%–8%. These findings suggest extinct magmatic activity and ongoing hydrothermal circulation, likely prolonged due to fluid compartmentalization at depth by low‐permeability magmatic or metamorphic rocks.

• Tegner, C.; Guo, P.; Chatterjee, S.; Lambart, S.; Jones, Morgan Thomas & Planke, Sverre [Vis alle 27 forfattere av denne artikkelen] (2026). A whole rock geochemical dataset for magmatic rocks drilled on the mid-Norwegian margin. Scientific Data. 13. doi: 10.1038/s41597-026-07073-x. Fulltekst i vitenarkiv Vis sammendrag

  The mid-Norwegian margin is one of the best studied volcanic rifted margins on Earth. Geophysical investigations have demonstrated the presence of well-developed inner and outer Seaward Dipping Reflectors (SDRs), landward flows, lava deltas, marginal highs, volcanic centers, ash layers, and sill complexes. These features have been proven to consist of magmatic rocks through the international Deep Sea Drilling Program (DSDP Leg 38, 1974), Ocean Drilling Program (ODP Leg 104, 1985), International Ocean Discovery Program (IODP Expedition 396, 2021), and commercial drilling. A total of fifteen drill cores penetrated magmatic rocks that formed between 57 and 50 million years ago (Ma). Here we provide (i) new ( n =  224) major and trace element compositions obtained by X-ray fluorescence (XRF), inductively-coupled plasma mass spectrometry (ICP-MS), and inductively-coupled optical emission spectrometry (ICP–OES) on whole rock powders of magmatic rocks for IODP Exp. 396 ( n  = 119), ODP Exp. 104 ( n =  79), DSDP Exp. 38 ( n  = 24); and (ii) a compilation of all new and published data for magmatic rocks in the fifteen drill cores ( n  = 563). Portable X-ray fluorescence (pXRF) data ( n  = 381) for the IODP Exp. 396 cores are also reported. These datasets provide a resource for examining the origin of magmatism associated with continental breakup and rifted margin formation, particularly the formation of excess magmatism compared to normal mid-oceanic spreading ridges, mantle-crust interaction, and the linkage of magmatism to global hyperthermal events on Earth’s surface.

• Zuchuat, Valentin; Janocha, Julian; Brooks, Hannah L.; Buchwald, Stella Z.; Beaty, Brian & Tarhan, Lidya G. [Vis alle 13 forfattere av denne artikkelen] (2026). New insights on the depositional environment and dynamics of the lowermost Triassic in Svalbard: linking the Sørkapp-Hornsund High to western and central Spitsbergen. Sedimentologika. 4(1). doi: 10.57035/journals/sdk.2026.e41.2413. Fulltekst i vitenarkiv Vis sammendrag

  The area now known as the Barents Shelf region was strongly impacted by the End-Permian Mass Extinction and a fundamental reorganisation of source-to-sink systems along the northern margin of Pangaea. Here we integrate new sedimentological, ichnological, chemostratigraphic, and provenance data from western Spitsbergen, collected at Festningen, Reinodden, and the Sørkapp-Hornsund High (Hornsundneset, southern Spitsbergen), to reconstruct the timing and drivers of Early Triassic basin evolution. At Festningen and Reinodden, the sharp but conformable transition from Permian spiculitic Kapp Starostin Formation strata to siliciclastic mudstones and sandstones of the Lower Triassic Vardebukta Formation coincides with the onset of the negative δ13Corg excursion. The Vardebukta Formation preserves seven stacked transgressive–regressive packages within an Induan-age interval of ca 1.2 to 1.6 Myr. Individual cycle durations (ca 177 to 225 kyr) are incompatible with a single dominant Milankovitch component and instead suggest bundling of orbital frequencies and/or strong autogenic modulation of accommodation and sediment supply. On the Sørkapp-Hornsund High, a 75 Myr hiatus above Mississippian continental deposits is terminated by a 10 to 15 cm thick bentonitic tephra bed linked to the Siberian Traps Large Igneous Province. This is overlain by Induan-age polymictic alluvial-fan and ephemeral braided-river conglomerates (Brevassfjellet Beds), on which limited but recurrent vegetation cover developed. Detrital-zircon age spectra from the conglomerates closely match published data from the Vardebukta Formation at Festningen and the Induan-age Parish Bjerg Formation in Greenland, indicating a shared north Greenland Caledonian source and direct sediment routing during the latest Permian and earliest Triassic. These continental conglomerates are capped by fossiliferous shallow-marine limestones of Dienerian age, which are then overlain by the coarsening-upward shelfal succession of the Vardbukta Formation. The timing of Dienerian flooding of the Sørkapp-Hornsund High is not aligned with any individual transgressive-regressive package in the Vardebukta Formation, implying that local tectonic subsidence of a promontory-like high, rather than eustatic rise, governed its transgression. This research refines the palaeogeographical and tectonostratigraphical evolution of the northern margin of Pangaea during the latest Permian and earliest Triassic.

• Morris, Richard Ashley; Lambart, Sarah; Zarikian, Carlos A. Alvarez; Millett, John; Jones, Morgan Thomas & Planke, Sverre [Vis alle 16 forfattere av denne artikkelen] (2026). Recommendations for using core X-ray fluorescence data on basaltic rock as a tool to assess compositional variability. Scientific Drilling. ISSN 1816-8957. 35, s. 21–37. doi: 10.5194/sd-35-21-2026. Fulltekst i vitenarkiv Vis sammendrag

  Portable and core-scanning X-ray fluorescence (XRF) instruments have become increasingly utilized in making rapid, non-destructive chemical characterizations with high spatial resolution on a range of materials. Since basaltic cores are often highly fractured and uneven, portable XRF (pXRF) is preferred to conduct discrete chemical analyses. However, in this case, the user must select the location for each analysis, which can lead to biased datasets. Alternatively, XRF core-scanning (XRF-cs) instruments take a series of measurements along a section of core, increasing the number of analyses and, therefore, eliminating some of the bias introduced by discrete analyses conducted with a pXRF. The XRF-cs does, however, still require a flat sampling surface along the core that does not include void spaces, making rigid, vesicular, and often cracked basalts suboptimal targets. We collected 797 XRF-cs measurements on three basaltic cores collected during the International Ocean Discovery Program Expedition 396 to evaluate how effectively an XRF core scanner can build large, chemically representative datasets. We developed a method for filtering XRF-cs measurements and calibrated the data using discrete calibrated pXRF analyses and compared the XRF-cs data to pXRF and conventional bulk-rock data using various immobile (e.g., Al, Ti, Zr, Ni, Mn, Zn) and mobile (e.g., K, Ca, Sr) elements. The comparison between datasets shows that (1) the XRF-cs data reproduce trends observed by pXRF and conventional bulk-rock data at both the regional scale and the core scale, and (2) in some cases, the higher spatial resolution of the XRF-cs data reveals geochemical variations that are otherwise obscured using discrete analyses. The workflow outlined by this study can be used to select samples for future studies by efficiently providing reliable geochemical data for characterizing new and legacy hard-rock cores.

• Zastrozhnov, Dmitrii; Zastrozhnov, Dmitry; Millett, John; Millett, John M.; Planke, Sverre & Polteau, Stéphane [Vis alle 18 forfattere av denne artikkelen] (2026). Polymetallic nodules offshore NE Greenland: links to Fram Strait opening and local hydrothermal activity. Sedimentary Geology. ISSN 0037-0738. 495, s. 107033–107033. doi: 10.1016/j.sedgeo.2026.107033. Fulltekst i vitenarkiv Vis sammendrag

  This study presents the first documentation and analysis of polymetallic Fe–Mn seafloor nodules from offshore Northeast Greenland. Samples were collected from three sites by dredging and gravity coring along the slopes of both the outer and transform margin highs. The morphology, petrography, and whole-rock geochemistry of twenty-four nodules were determined. 10Be/9Be and (U–Th)/He dating were undertaken for representative samples to constrain the time of formation. Two nodule groups were identified in all studied sampling sites. Group 1 (n = 19) are light banded, primarily hydrogenetic nodules with notable enrichments in Mn and Fe, as well as several trace elements including rare earth elements (REE), V, Co, and Y. They have geochemical and textural similarities to Fe–Mn deposits from the Arctic Basin. 10Be/9Be age estimates suggest that growth initiated around 13,5 Ma, shortly after the opening of the Fram Strait, which influence deep-water circulation and inflow of nutrient-rich Arctic waters onto the NE Greenland shelf. Group 2 nodules (n = 5) are dense with high Fe (up to 64 wt% Fe2O3), low Mn content and little to no enrichment in trace elements and REEs. They are interpreted as hydrothermal in origin, with preliminary (U–Th)/He ages suggesting Quaternary formation under weak, diffuse fluid circulation in near-bottom environments of uncertain source. This study expands our understanding of seafloor mineralization in the Arctic–North Atlantic gateway, revealing that on the NE Greenland shelf this process reflects a long-term interplay between tectonic evolution, ocean circulation, and fluid-driven alteration.

• Cunningham, Emily H.; Lambart, Sarah; Guo, Pengyuan; Chatterjee, Sayantani; Tegner, Christian Maughan & Hartley, Autumn [Vis alle 25 forfattere av denne artikkelen] (2026). Evolution of the Source Mineralogy and Lithospheric Controls on Magmatism During the Northeast Atlantic Continental Breakup. Geochemistry Geophysics Geosystems. 27(2). doi: 10.1029/2025gc012556. Fulltekst i vitenarkiv Vis sammendrag

  The mid‐Norwegian Margin, part of the North Atlantic Igneous Province (NAIP), is a well‐studied volcanic rifted margin formed during the breakup between Greenland and Eurasia ∼56 Ma, with the largest accumulation of magmatic material hosted by the Vøring Margin section. Despite extensive study in the area, the main controls on magmatic productivity during continental breakup remain debated. To constrain the drivers of breakup magmatism, we developed an inverse Monte Carlo statistical melting model that infers source mineralogy from basalt chemistry. When applied to basalts recently recovered on the Vøring Margin, our results reveal a clear shift in source mineralogy during rifting, with peak magmatism coinciding with clinopyroxene enrichment, despite mantle potential temperatures likely being capped below 1500°C. We also establish that, while the proto‐Iceland mantle plume played a role during the emplacement of the NAIP, the main driver for the continental breakup magmatism is lithospheric thinning as a consequence of continent breakup. This study provides new insights into the magmatic and geodynamic evolution of the mid‐Norwegian Margin, emphasizing the role of lithospheric refertilization in driving breakup magmatism.

• Polteau, Stéphane; Smalley, P. Craig; Devegowda, Vani N.; Johansen, Ingar; Millett, John & Rosenqvist, Marija Plahter [Vis alle 8 forfattere av denne artikkelen] (2026). Well-connected basalt sequences as potential reservoirs for large-scale carbon sequestration revealed by strontium isotopes. Communications Earth & Environment. 7(1). doi: 10.1038/s43247-025-03020-7. Fulltekst i vitenarkiv Vis sammendrag

  Abstract Permanent storage of gigatons of carbon in basalt requires thick, uncompartmentalized sequences that allow lateral dissipation of CO 2 away from injection sites. Here we assess the presence of flow barriers by evaluating the variations in 87 Sr/ 86 Sr patterns in pore water, a method used extensively in sedimentary successions. Present-day pore water 87 Sr/ 86 Sr was measured from residual salts in core samples, while past water compositions were reconstructed from carbonate cements of different ages. We reveal smooth and uninterrupted trends in strontium isotopes through a 100 m thick basalt section indicating a common fluid reservoir unaffected by low-permeability massive lava flow interiors. The data further indicate that unconsolidated overburden sediments act as a good seal preventing seawater to mix with in situ pore water, and buoyant supercritical CO 2 to leak. Finally, basaltic sequences form viable targets for CO 2 storage and suggests that fractures may bypass low-permeability units to create a well-connected reservoir system.

• Betlem, Peter; Rosenqvist, Marija Plahter; Millett, John; Griffiths, Luke; Filina, Irina & Park, Joonsang [Vis alle 9 forfattere av denne artikkelen] (2025). Fluid flow behaviour in vesicular basalt samples from the Skoll High, Vøring Margin. Geomechanics and Geophysics for Geo-Energy and Geo-Resources. ISSN 2363-8419. 12(1). doi: 10.1007/s40948-025-01080-9. Fulltekst i vitenarkiv Vis sammendrag

  Abstract This study presents the fluid flow testing results of 32 lava flow samples recovered from IODP Sites U1571/U1572 (145–315 mbsf) on the Skoll High, Vøring Margin. Few past studies have investigated the mid-Norwegian margin’s basalt reservoir and flow properties. Even fewer implement subsurface-like conditions to explore in-situ fluid flow and the possible response to changing pore fluids during injection. These aspects are critical for large-scale carbon sequestration. In this study, hydraulic properties including porosity and permeability were measured at ambient conditions for all samples along with multi-stress, multi-fluid core flooding experiments on a representative sample enclosed in an X-ray µCT scanner. Petrographic observations reveal varying degrees of alteration with secondary clays, including smectite, commonly lining pores and vesicles. He-porosities (4.2–45.6%) fall mostly below the theoretical percolation threshold of ~ 30% for randomly distributed spherical pores. Klinkenberg-corrected nitrogen-gas permeability (0.0038–361.9 mD) shows weak correlation to porosity and no apparent depth dependence. Further, brine permeability is four orders of magnitude lower than gas permeability, with no notable flow reduction during injection of CO 2 . Rather than being stress-dependent, we argue that brine-induced swelling significantly reduced the accessibility of microstructural elements to fluids. The findings urge caution when using literature-reported, ambient gas measurements for basalts with similar levels of alteration as they may not accurately reflect in-situ fluid flow properties. Low matrix permeability of the moderately to highly altered vesicular basalts and prevalence of swelling clays may, without major contributions from fractures, limit the injectivity potential into the basaltic lava flows on the Skoll High, Vøring Margin.

• Jones, Morgan Thomas; Augland, Lars Eivind; Ovtcharova, Maria; Stokke, Ella Wulfsberg; Ganerød, Morgan & Planke, Sverre (2025). New constraints on the absolute age and duration of the Paleocene – Eocene Thermal Maximum (PETM) from ash layer +19 in Denmark. Earth and Planetary Science Letters. ISSN 0012-821X. 671. doi: 10.1016/j.epsl.2025.119643. Fulltekst i vitenarkiv Vis sammendrag

  Precise age constraints for the onset and duration of the Paleocene–Eocene Thermal Maximum (PETM) are essential for understanding the mechanisms that triggered and sustained this major climate perturbation. However, establishing a precise PETM geochronology is complicated by uncertainties in orbital tuning and a current lack of precise radiometrically dated marker horizons. An early Eocene rhyolitic ash layer named +19 is a promising marker horizon due to its distinct geochemistry, its occurrence in key offshore archives, and well-preserved outcrops in Denmark such as Stolleklint, where it conformably overlies PETM strata. We present a new high-precision U-Pb zircon age of 55.331 ± 0.053/(0.060)/[0.080] Ma for ash +19, supported by a new Ar-Ar age of 55.424 ± 0.115/(0.116)/[0.320] Ma within uncertainty. The ash +19 U-Pb age enables direct comparison with ash SB01–1 in Svalbard that was erupted during the PETM carbon isotope excursion (CIE), yielding a 454 ± 90 kyr interval between the two layers. This provides a robust geochronological link from the PETM to ash +19 that is independent of stratigraphic interpretations. Using end-member PETM durations (94–170 kyr), we estimate the time between the PETM onset and ash +19 as 528–604 ± 102 kyr, which is significantly shorter than the 862 ± 20 kyr interval derived from astronomical tuning. Adopting the longer helium isotope-based PETM duration yields an onset age of 55.935 ± 0.102 Ma, with a CIE recovery end at 55.700 Ma. A shorter PETM duration requires a younger PETM onset age. The positive ash series in Denmark, correlating with the offshore Balder Formation, is now constrained to a 250 kyr interval between 55.367 and 55.117 ± 0.080 Ma. This refined age model provides a robust framework for testing and improving early Eocene astronomical time scales.

• Knies, Jochen Manfred; Killops, Stephen; Brekke, Trond; Grøsfjeld, Kari; Sliwinska, Kasia K. & Planke, Sverre [Vis alle 13 forfattere av denne artikkelen] (2025). A prolific Tertiary source rock of terrestrial origin in the eastern Nordic Seas. Marine and Petroleum Geology. ISSN 0264-8172. 183. doi: 10.1016/j.marpetgeo.2025.107637. Fulltekst i vitenarkiv Vis sammendrag

  This study evaluates the source rock potential, organic matter input, and depositional environments of Miocene-aged sediments in the eastern Nordic Seas. It focuses on ODP/IODP Sites 909, 985, and U1572, two exploration wells (7316/5-1 and 6608/10-1), and oil seeps offshore western Svalbard. Integrated marine palynological, biomarker, and geochemical analyses indicate a mainly Early to Middle Miocene age and a mixed terrestrial-marine origin of the sedimentary organic matter and associated oil seeps. Angiosperm-derived biomarkers, especially triterpenoids like oleananes and oleanenes, are abundant and help link seeping oils to deltaic terrestrial sources. Depositional settings ranged from oxic in the Fram Strait (Hole 909C) to dysoxic or anoxic in southern Sites (Holes 985A and U1572B), influenced by the semi-enclosed Nordic Seas. Geochemical indicators such as sulfur content, TOC/S ratios, and Pr/Ph values reflect variations in bottom water oxygenation and sediment conditions. Terrestrial organic input is linked to Miocene deltaic systems, likely formed by tectonic uplift in East Greenland, the Barents Sea, and central Norway. Basin modeling in the southwestern Barents Sea, using seismic and well data, shows that Miocene source rocks have reached maturity levels sufficient for hydrocarbon generation, especially beneath thick Plio-Pleistocene glacial overburden. The presence of oleanene and oleanane in both boreholes and oil seeps supports the conclusion that these Miocene source rocks are regionally widespread and part of an active petroleum system

• Smyrak-Sikora, Aleksandra; Betlem, Peter; Engelschiøn, Victoria Sjøholt; Foster, William J.; Grundvåg, Sten-Andreas & Jelby, Mads Engholm [Vis alle 26 forfattere av denne artikkelen] (2025). Phanerozoic paleoenvironmental and paleoclimatic evolution in Svalbard. Climate of the Past. ISSN 1814-9324. 21(11), s. 2133–2187. doi: 10.5194/cp-21-2133-2025. Fulltekst i vitenarkiv Vis sammendrag

  Sedimentary rocks can provide information about the Earth paleoenvironment and are studied extensively to understand the causes and consequences of global climate changes in deep time. They facilitate long-time perspectives that constrain climate models and provide analogues for how Earth systems may respond to, and recover from, intervals of profound environmental change, including projected anthropogenic change. The Norwegian Svalbard archipelago offers an extensive Phanerozoic stratigraphic record that reflects the geological evolution of the northern flanks of continental assemblages that include Laurentia, Eurasia, and Pangea. Svalbard's Phanerozoic sedimentary and paleoclimatic archive is controlled largely by Svalbard's overall northward plate-tectonic motion from equatorial to high latitudes but also by regional to local formation of topography and basins in response to long-term plate reorganization, as well as the near- and far-field influence of large igneous province activity on the tectono-stratigraphic and paleoclimatic development. Various sedimentary and geochemical proxies, such as bentonite beds and carbon isotope excursions associated with the far-reaching environmental effects of the Siberian Traps, the High Arctic Large Igneous Province, and the North Atlantic Igneous Province, are present in Svalbard's near complete geological record. As such, Svalbard is unique in that these and numerous other global environmental perturbations are recorded within a relatively restricted study area, with most of the key events preserved and recorded in easily accessible drill cores and well-exposed outcrop sections. Here we review deep-time paleoenvironmental and paleoclimate research in Svalbard by summarizing 148 peer-reviewed scientific articles. The review builds on the well-established tectono-stratigraphic and lithostratigraphic framework, as well as state-of-the art environmental reconstructions, to provide insights into the Earth system during the Phanerozoic northward drift of Svalbard and the many major biotic crises in the geological past. We focus on globally significant events including (i) the expansion of Devonian vegetation, (ii) the Carboniferous–Permian response to icehouse conditions during the Late Paleozoic Ice Age (LPIA), (iii) the End-Permian Mass Extinction (EPME) and the subsequent Triassic recovery, the (iv) Carnian Pluvial Episode, (v) Jurassic–Early Cretaceous climate perturbations including the Volgian Isotopic Carbon Excursion (VOICE) and the Aptian Ocean Anoxic Event 1a (OAE1a), and (vi) the Paleocene–Eocene Thermal Maximum (PETM). We present and synthesize existing core and outcrop data that preserve biological and geochemical proxies and climate-sensitive sedimentary facies that reflect environmental change in terrestrial and marine settings. Finally, we discuss the Phanerozoic climate recorded in Svalbard and its role in providing high-latitude calibration points for several global paleoclimate events to provide a higher-latitude perspective to complement the dominance of mid- and low-latitude locations and datasets in the literature.

• Binde, Cornelia Mentzoni; Manton, B.; Plaza-Faverola, Andreia; Bünz, Stefan & Planke, S. (2025). Seismic Characteristics and Morphology of an Igneous Intrusion in the Vøring Basin, Offshore Norway: New Insights on the Lateral Evolution of Elongated Intrusions. Geochemistry Geophysics Geosystems. 26(10). doi: 10.1029/2025gc012429. Fulltekst i vitenarkiv Vis sammendrag

  Igneous sill intrusions are common features in volcanic basins worldwide, constituting important components of basin‐scale magma plumbing systems. While sills exhibiting simple geometries, such as saucer‐shaped sills, are commonly linked to distinct mechanical processes, emplacement mechanisms for sills exhibiting more complex geometries are debated. To better understand the emplacement of complex sills, this study aims to constrain the formation mechanisms associated with the Infinity Sill, a 237 km 2 elongated sill located in the SW Vøring Basin. Detailed seismic interpretation and attribute analysis of an industry‐standard 15,000 km 2 3D seismic data set reveal that the 36 km long and 4–8 km wide Infinity Sill intruded mud‐dominated Late Cretaceous strata. The thickness of the sill has been estimated to be dominantly 50–150 m, with a volume of ∼20 km 3 (ranging between 7.9 and 25.5 km 3 ). The shape of the sill and geometry of the sill elements suggest that the sill propagated as a large, magma‐filled fracture exploiting a pre‐existing polygonal fault network during propagation. The sill originated at a source in the SW, and the asymmetric propagation away from the source facilitated a 36 km lateral elongation of the sill, contrasting along‐axis dike models for elongated intrusion geometries. Local deformation around the sill initially facilitated continuous transgression, but with increasing sill length, forced folding of the overburden triggered abrupt transgression of the sill margins, resulting in a lateral change in geometry. The Infinity Sill, with its distinct geometrical features and changing cross‐sectional geometry, demonstrates that complex sill geometries are formed by a combination of emplacement mechanisms.

• Kjøll, Hans Jørgen; Midtkandal, Ivar; Manton, Ben & Planke, Sverre (2025). Seismic Geomorphology of an Early Eocene Canyon‐Channel‐Lobe System North of Shetland. Basin Research. ISSN 0950-091X. 37(3), s. 78–105. doi: 10.1111/bre.70031. Fulltekst i vitenarkiv Vis sammendrag

  Submarine canyon and channel systems are the primary paths for sediment transport from platforms to deep‐sea terminal depositional fans and are present on all continental margins. The temporal morphological expression of such systems should be documented in order to fully understand the development of these important sediment pathways. We utilise a 3D seismic dataset from the northern Shetland Platform to the southern Møre Basin region and map two regionally continuous seismic horizons. The dataset includes an early Eocene northward‐oriented canyon‐channel system that allows high‐resolution mapping of erosion and sedimentation. The morphology of the system allows a subdivision of platform, upper, middle, and lower slope, and basin floor. It is further subdivided from east to west according to the degree of erosive maturity. The platform contains channel shapes and their fill stretching from the south towards the platform edge and upper slope, where dendritic canyon heads developed. Scars in the canyon sidewalls indicate slope failure as an important widening mechanism. The slope canyons progressively shallow and widen basinward. At the canyon exits, deepwater submarine channels developed and continued onto the basin floor. We document progressive filling and overspilling of channels towards the terminal fan. The filling of the channels that resulted in overbank deposition is likely due to a decrease in slope gradient leading to an increased deposition rate that exceeds the channel capacity. Post‐depositional differential compaction of the clastic channel fill and the surrounding muddy sediments causes the channel fills to form elongated ridges that lead towards the terminal fan. It is further shown that the morphological elements observed in the canyon‐channel system adjust towards an equilibrium profile with a shallower gradient. These detailed observations provide an enhanced understanding of how canyon‐channel systems develop on active margins and how sediment transport pathways are influenced by the submarine equilibrium profile and post‐depositional processes.

• Nygaard, Madeleine Skov; Planke, Sverre; Zastrozhnov, Dmitry; Midtkandal, Ivar; Huismans, Ritske Sipke & Faleide, Jan Inge [Vis alle 13 forfattere av denne artikkelen] (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. Fulltekst i vitenarkiv Vis sammendrag

  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.

• Senger, Kim; Ammerlaan, Fenna; Betlem, Peter; Dumais, Marie-Andrée; Eagles, Graeme & Foster, William [Vis alle 29 forfattere av denne artikkelen] (2025). Geology of Svalbard: Deep-time and Deep-Earth (SVALGEOL). I Neuber, R.; Łupikasza, E.; Hübner, C. & Holmén, K. (Red.), The State of Environmental Science in Svalbard – an annual report. Svalbard Integrated Arctic Earth Observing System. ISSN 9788293871149. s. 52–83. doi: 10.5281/zenodo.14425478. Fulltekst i vitenarkiv Vis sammendrag

  Geology is omnipresent in Svalbard, defining among other parameters the location of all major settlements. The SVALGEOL chapter provides an overview of the geology of Svalbard, and how it influences local and global society. We briefly describe the history of geological exploration and mapping of Svalbard, before outlining the various data sets geoscientists use in their work. We then focus on two key aspects of geology: the study of “deep-time” (i.e., rocks older than 2.58 million years; the pre-Quaternary period) and the study of “deep-Earth” (i.e., integration of data from Earth’s surface to the interior). By investigating the Earth System at the scale of millions to billions of years, geologists can decipher how the global climate has varied through time. Furthermore, studying different proxies allows us to investigate the processes linking the geosphere with the biosphere (e.g., evolution of life, recovery following mass extinctions). By using field and various geophysical data, geologists can understand the properties of the Earth from its surface to its core, and the processes causing them. Furthermore, by coupling deep, shallow and surface observations with a time component, geoscientists can characterise the underlying processes that also influence society (e.g., natural gas emissions, permafrost development, geothermal potential, earthquakes)

• Vickers, Madeleine Larissa; Jelby, Mads Engholm; Blok, Carlette Neline; Price, Gregory D.; Jerrett, Rhodri M. & Jensen, Maria [Vis alle 7 forfattere av denne artikkelen] (2025). Early Cretaceous giant glendonites: A record of (sub-)millennial-scale cooling? Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 661. doi: 10.1016/j.palaeo.2025.112739. Fulltekst i vitenarkiv Vis sammendrag

  The Lower Cretaceous succession in Svalbard contains numerous glendonites, pseudomorphs after the cold-water carbonate mineral ikaite, which have been used in conjunction with other evidence to argue for episodic global cooling punctuating the greenhouse climates of the Early Cretaceous. Recent fieldwork in central Spitsbergen has recovered giant bladed glendonites of up to half a metre long, the largest ever recorded in a Lower Cretaceous site, and comparable in size to outlier glendonites found in similar-aged strata of the Sverdrup Basin in Arctic Canada. Unlike the rosette to pineapple-like morphologies seen in some of the largest Canadian Arctic specimens, the new finds in Svalbard appear only as single or crossed blades. These large glendonites, found clo indicate that very local variations in pore water chemistry governed whether numerous small ikaite crystals or few large crystals grew. Taken with evidence from modern ikaite and other large ancient glendonites, we argue that large glendonites such as these (>30 cm long) are pseudomorphs after ikaites that took, at the shortest, decades, but potentially millennia to even tens of millennia to attain their massive size. As growth of the parent ikaite took place in the sediments just below the seafloor of the shallow, epicontinental seas of the High Arctic (then situated at c. 63–66°N), this is consistent with the hypothesis that geologically short-term cooling episodes interrupted the background warmth of the Early Cretaceous greenhouse, although the duration, extent, and cause of such cooling is still debated.

• Faleide, Jan Inge; Zastrozhnov, Dmitrii; Abdelmalak, Mohamed Mansour; Manton, Ben M.; Planke, Sverre & Gernigon, Laurent [Vis alle 8 forfattere av denne artikkelen] (2025). Møre–Vøring Composite Tectono-Sedimentary Element, Norwegian Rifted Margin, Norwegian Sea. Geological Society of London Memoirs. ISSN 0435-4052. 57, s. 174–196. doi: 10.1144/M57-2023-14. Fulltekst i vitenarkiv Vis sammendrag

  The Møre and Vøring basins at the mid-Norwegian margin were affected by a series of rift phases separated by periods of tectonic quiescence from Caledonian collapse in the Devonian to final continental break-up in the earliest Eocene. The tectonic phases were mostly extensional in nature, and the pre-drift extension across the Møre and Vøring basins since mid-Permian time has been estimated to be of the order of 200–250 km. The pre-Cretaceous basin configuration is poorly constrained due to limited seismic resolution at great depths and a lack of borehole control. A fundamental change occurred in the crustal deformation regime: from Late Jurassic distributed stretching of the upper crust to Early Cretaceous thinning at lower-crustal levels located along the axis of the Møre and Vøring basins. A westward migration of Late Cretaceous–Paleocene depocentres in the Vøring Basin reflects the focus of deformation towards the time and line of break-up. The basin architecture and evolution are summarized in relation to tectono-sedimentary elements corresponding to the main tectonic and depositional phases, and represent characteristic megasequences in the seismic data. Finally, the exploration history and main petroleum systems of the Møre and Vøring basins are presented.

• Millett, J.M.; Jolley, D.W.; Hole, M.J.; Augland, Lars Eivind; Pugsley, J.H. & McLeod, G.W. [Vis alle 7 forfattere av denne artikkelen] (2024). High-precision U/Pb zircon dating of explosive volcanism in an early bi-modal volcano-sedimentary sequence from the Isle of Mull, North Atlantic Igneous Province. Lithos. ISSN 0024-4937. 482-483. doi: 10.1016/j.lithos.2024.107729. Fulltekst i vitenarkiv Vis sammendrag

  The North Atlantic Igneous Province (NAIP) forms one of the best studied Large Igneous Provinces (LIP) on the planet, however, significant uncertainties regarding the age and nature of the early onset of volcanism across the province remain. In order to better understand the onset and timing of volcanism within the NAIP, we present a new study of the mixed volcano-sedimentary deposits exposed at the base of the Isle of Mull lava pile, Inner Hebrides, Scotland. The study area comprises organic rich estuarine sediments, intimately mixed and interdigitated with bi-modal composition volcaniclastic and pyroclastic interlayers, including a prominent stratigraphically constrained c. 30 cm thick water-lain rhyolitic ignimbrite. Pristine magmatic zircons liberated from the ignimbrite reveal a high precision Usingle bondPb age of 62.035 ± 0.041 Ma (2σ) giving a robust age for early volcanism in this part of the province. Field observations reveal evidence for mafic phreatomagmatic eruptive deposits both above and below the rhyolite documenting the bimodal explosive nature of the initial magmatism in this area and, importantly, that mafic magmatism initiated before the dated unit. The bi-modal explosive eruptions periodically inundated an otherwise quiet and low energy Danian aged estuarine environment prior to its inundation with lava as magmatism took hold in the region.

• Millett, John M.; Rossetti, Lucas; Bischoff, Alan; Rossetti, Marcos; Rosenqvist, Marija Plahter & Avseth, Per Åge [Vis alle 11 forfattere av denne artikkelen] (2024). Lava flow-hosted reservoirs: a review. Geological Society Special Publication. ISSN 0305-8719. 547(1), s. 357–387. doi: 10.1144/SP547-2023-102. Fulltekst i vitenarkiv Vis sammendrag

  Lava flows form important fluid reservoirs and have been extensively exploited for water aquifers, geothermal energy, hydrocarbon production and, more recently, for carbon storage. Effusive subaerial mafic to intermediate lava flows account for vast rock volumes globally, and form reservoirs with properties dictated by well-known lava flow facies ranging from pāhoehoe through several transitional forms to ‘a’ā lava. These variations in flow type lead to critical differences in the pore structure, distribution, connectivity, strength and fracturing of individual lava flows, which, alongside lava flow package architectures, determine primary reservoir potential. Lava flow margins with vesicular, fracture and often autobreccia-hosted pore structures can have porosities commonly exceeding 40% and matrix permeabilities over 10−11 m2 (>10 D) separated by much lower porosity and permeability flow interiors. Secondary post-emplacement physicochemical changes related to fracturing, meteoric, diagenetic and hydrothermal alteration can significantly modify reservoir potential through a complex interplay of mineral transformation, pore-clogging secondary minerals and dissolution, which must be carefully characterized and assessed during exploration and appraisal. Within this contribution, a review of selected global lava flow-hosted reservoir occurrences is presented, followed by a discussion of the factors that influence lava flow reservoir potential.

• Faleide, Jan Inge; Abdelmalak, Mohamed Mansour; Zastrozhnov, Dmitrii; Lasabuda, Amando P. E.; Hjelstuen, Berit Oline Blihovde & Laberg, Jan Sverre [Vis alle 7 forfattere av denne artikkelen] (2024). Norwegian Sea Oceanic Basin and Prograded Margins Composite Tectono-Sedimentary Element. Geological Society of London Memoirs. ISSN 0435-4052. 57(1). doi: 10.1144/M57-2023-26. Fulltekst i vitenarkiv Vis sammendrag

  The Norwegian Sea oceanic basins and prograded margins have developed since NE Atlantic break-up in the earliest Eocene. Significant amounts of sediments were fed to the regionally subsiding and widening Norwegian Sea during the Cenozoic as a result of several phases of uplift and erosion of the bounding shelves and their hinterland. Despite an overall passive-margin evolution, the area experienced tectonic events and associated processes that interrupted the regional subsidence, causing contraction/inversion and tilting. The post-break-up depositional history of the mid-Norwegian margin comprises two main stages: (1) middle Eocene–Pliocene margin subsidence and relatively modest sedimentation during a period of climatic decline; and (2) latest Pliocene–Pleistocene full-scale northern hemisphere glaciations that resulted in deep erosion of shelves and hinterlands, and very high sedimentation rates and large-scale continental margin progradation. Slope failures within rapidly deposited glacial sediments affect

• Morris, A.M.; Lambart, S.; Stearns, M.A.; Bowman, J.R.; Jones, Morgan Thomas & Mohn, G. [Vis alle 30 forfattere av denne artikkelen] (2024). Evidence for Low-Pressure Crustal Anatexis During the Northeast Atlantic Break-Up. Geochemistry Geophysics Geosystems. 25(7). doi: 10.1029/2023GC011413. Fulltekst i vitenarkiv
• Huebner, Nico; Fowler, Jim; Manton, Ben; Zastrozhnov, Dmitrii; Planke, Sverre & Badics, Balasz [Vis alle 7 forfattere av denne artikkelen] (2024). Sub-Basalt Hydrocarbon Exploration at the Vøring Marginal High, 85th EAGE Annual Conference & Exhibition. European Association of Geoscientists and Engineers (EAGE). ISSN 9789462824980. doi: 10.3997/2214-4609.202410990. Fulltekst i vitenarkiv
• Maharjan, Dwarika; Planke, Sverre; Bellwald, Benjamin; Millett, John M.; Abdelmalak, Mohamed Mansour & Manton, Ben [Vis alle 9 forfattere av denne artikkelen] (2024). Rapid loading and deformation of soft sediments during emplacement of a Lava Delta in the Vøring Basin, Mid-Norwegian Margin. Geological Society Special Publication. ISSN 0305-8719. 547(1), s. 465–482. doi: 10.6084/m9.figshare.c.6946691.v1. Fulltekst i vitenarkiv
• Manton, Ben; Millett, John; Zastrozhnov, Dmitrii; Lebedeva-Ivanova, Nina N.; Planke, Sverre & Myklebust, Reidun [Vis alle 7 forfattere av denne artikkelen] (2024). Sedimentary and Volcanic Systems at the Flanks of the South Gjallar Ridge, offshore Norway, 85th EAGE Annual Conference & Exhibition. European Association of Geoscientists and Engineers (EAGE). ISSN 9789462824980. doi: 10.3997/2214-4609.2024101544. Fulltekst i vitenarkiv
• Senger, Kim; Betlem, Peter; Helland-Hansen, Annikken; Horota, Rafael Kenji; Kämpf, Horst & Kontny, Agnes M. [Vis alle 11 forfattere av denne artikkelen] (2024). Multi-disciplinary geoscientific expedition to Woodfjorden, NW Svalbard: Field sites, methods, and preliminary results. Czech Polar Reports. ISSN 1805-0689. 13(2), s. 142–161. doi: 10.5817/CPR2023-2-12. Fulltekst i vitenarkiv Vis sammendrag

  The Woodfjorden area of northern Spitsbergen (NW Svalbard) offers access to the world’s northernmost onshore thermal springs, extinct Pleistocene alkali basaltic volcanoes and Miocene flood basalts including extensive hyaloclastites. In July 2023, we undertook a 14-day international multi-disciplinary geoscientific expedition to Woodfjorden-Bockfjorden to investigate the Cenozoic geological evolution of the area. The expedition objectives spanned a wide range of scientific topics from sampling of fluids and gas in the thermal springs to constraining the lithosphere by acquiring magnetotelluric data and sampling volcanic rocks. More specifically, we have 1) conducted gas, fluid and travertine sampling at the thermal springs of Gygrekjelda, Jotunkjeldene and Trollkjeldene, 2) mapped and sampled the Quaternary volcanic centers at Sverrefjellet and Halvdanpiggen, 3) sampled the Miocene basalts of the Seidfjellet Formation along seven profiles plus the underlying Devonian sedimentary rocks, 4) acquired magnetotell

• Gernigon, Laurent; Knies, Jochen Manfred; Schönenberger, Jasmin; Piraquive, Alejandro; Lelij, Roelant van der & Huyskens, Magdalena H. [Vis alle 12 forfattere av denne artikkelen] (2024). Understanding volcanic margin evolution through the lens of Norway's youngest granite. Terra Nova. ISSN 0954-4879. 36(4), s. 250–257. doi: 10.1111/ter.12705. Fulltekst i vitenarkiv
• Berndt, Christian; Planke, Sverre; Zarikian, Carlos A. Alvarez; Frieling, Joost; Jones, Morgan Thomas & Millett, John M. [Vis alle 36 forfattere av denne artikkelen] (2023). Shallow-water hydrothermal venting linked to the Palaeocene–Eocene Thermal Maximum. Nature Geoscience. ISSN 1752-0894. 16, s. 803–809. doi: 10.1038/s41561-023-01246-8. Fulltekst i vitenarkiv Vis sammendrag

  The Palaeocene–Eocene Thermal Maximum (PETM) was a global warming event of 5–6 °C around 56 million years ago caused by input of carbon into the ocean and atmosphere. Hydrothermal venting of greenhouse gases produced in contact aureoles surrounding magmatic intrusions in the North Atlantic Igneous Province have been proposed to play a key role in the PETM carbon-cycle perturbation, but the precise timing, magnitude and climatic impact of such venting remains uncertain. Here we present seismic data and the results of a five-borehole transect sampling the crater of a hydrothermal vent complex in the Northeast Atlantic. Stable carbon isotope stratigraphy and dinoflagellate cyst biostratigraphy reveal a negative carbon isotope excursion coincident with the appearance of the index taxon Apectodinium augustum in the vent crater, firmly tying the infill to the PETM. The shape of the crater and stratified sediments suggests large-scale explosive gas release during the initial phase of vent formation followed by rapid, but largely undisturbed, diatomite-rich infill. Moreover, we show that these vents erupted in very shallow water across the North Atlantic Igneous Province, such that volatile emissions would have entered the atmosphere almost directly without oxidation to CO2 and at the onset of the PETM.

• Planke, Sverre; Christian, Berndt; A, Alvarez Zarikian Carlos & 396, Scientific Party Expedition (2023). Mid-Norwegian Margin Magmatism and Paleoclimate Implications. Proceedings of the International Ocean Discovery Program. Expedition reports. doi: 10.14379/iodp.proc.396.2023. Fulltekst i vitenarkiv

Se alle arbeider i NVA

• Polteau, Stephane; Smalley, P. Craig; Devegowda, Vani; Millett, John; Rosenqvist, Marija Plahter & Abdelmalak, Mohamed Mansour [Vis alle 8 forfattere av denne artikkelen] (2026). Well-connected basalt sequences as potential reservoirs for large-scale carbon sequestration revealed by strontium isotopes. doi: https:/www.egu26.eu/. Fulltekst i vitenarkiv Vis sammendrag

  Basalt complexes can cover hundreds to thousands of km2 and be several km thick; with an estimated global capacity of 40 Tt for carbon storage, they represent a solution for the large-scale injection of CO2 to reach the 2050 emission targets. However, the hydraulic conductivity of basalt sequences is difficult to predict because it has never been the focus in basalt research. In this contribution, we evaluate for the first time the vertical fluid connectivity of a basalt sequence using the Sr isotope composition of pore waters, sampled using the strontium residual salt analysis (SrRSA) method. Thirty seven samples were collected in the U1571A borehole (IODP Expedition 396 on the Skoll High, offshore Mid-Norway). Sampling of the well targeted the most representative lithologies in the core, and hence included vesicular and tight basalt. The SrRSA method measures the 87Sr/86Sr ratio in the salt residue that precipitated in the pores of core samples after the pore water evaporated, and the value measured in the laboratory should accurately reflect that of the in situ pore water. However, since the well was drilled using seawater with barite and sepiolite additives, each sample was washed in de-ionized water to reduce potential contamination. The samples were subsequently dried, crushed, the salts were leached, the leachate filtered, and the strontium analyzed using a MC-ICPS. The results show that the Sr concentrations are very low: 1-35 ppb in vesicular basalt samples and up to 2 ppb in tight basalt samples. The 87Sr/86Sr ratio of the vesicular basalt varies little away from the average value of 0.7085, while the values of tight basalts show more variability with an average of 0.7093. The SrRSA pattern vs. depth for the vesicular basalt samples is smooth, indicating limited contamination from drilling fluids, and further suggesting a good vertical connectivity. On the other hand, the pattern of the tight basalts is shifted towards heavier values similar to modern seawater, suggesting the SrRSA for these samples to be contaminated by the drilling fluids. In addition to the residual salts, we are currently analyzing the 87Sr/86Sr in carbonate vesicles and in basalt, which together represent the three main reservoirs of strontium in the samples. These additional results should help us constrain the source of the strontium in the pore system (i.e.: external, flowing or diffusing through the sequence). These results further show that the fluid connectivity of basalt sequences can be characterized using the SrRSA method by focusing the analyses on vesicular basalt samples. Finaly, this study will provide additional constrains to follow-up numerical models simulating the injectivity and capacity of intra- and inter-basalt reservoir units.

• Polteau, Stephane; Smalley, P. Craig; Devegowda, Vani; Johansen, Ingar; Millett, John & Rosenqvist, Marija Plahter [Vis alle 8 forfattere av denne artikkelen] (2026). Fluid connectivity and evolution of pore water in breakup basalt offshore mid-Norway with implications for CO2 storage. doi: https:/ngwm2026.fi/. Fulltekst i vitenarkiv Vis sammendrag

  Basalt complexes can cover thousands of square kilometres and be several kilometres thick. With an estimated global carbon storage capacity of 40 Tt they represent a possible solution to reach the 2050 emission targets. However, the injection of gigatons of CO2 into basaltic formations requires a thick reservoir system lacking barriers to lateral fluid flow for the CO2 to dissipate away from injection points. In this contribution, we evaluate for the first time the vertical fluid connectivity of a basalt sequence using the Sr isotope composition of pore waters, sampled using the strontium residual salt analysis (SrRSA) method. Thirty-seven samples were collected in the U1571A borehole (IODP Expedition 396 on the Skoll High, offshore mid-Norway). Sampling of the well targeted the most representative lithologies and hence included vesicular basalt and massive flow interiors. The SrRSA method measures the 87Sr/86Sr ratio in the salt residue that precipitated in the pores of core samples after the pore water evaporated, and the value measured in the laboratory should accurately reflect that of the in-situ pore water. In addition to present-day pore water from the residual salts, the 87Sr/86Sr of past water compositions were reconstructed from carbonate cements of different ages. We reveal smooth and uninterrupted trends in strontium isotopes through a 100 m thick basalt section indicating a common fluid reservoir unaffected by the low-permeability massive lava flow interiors. The data further indicate that the unconsolidated overburden sediments act as a good seal preventing seawater to mix with in situ porewater and may prevent CO2 leakage to the surface for buoyant supercritical CO2 injection scenarios. This study supports the premise that basaltic sequences form viable targets for CO2 storage and suggests that fractures may bypass low-permeability units to create a well-connected reservoir system. Finally, the 87Sr/86Sr method is demonstrably useful in basalts, and warrants being included routinely in evaluating thick basalt sequences for large-scale CO2 storage.

• Polteau, Stephane; Smalley, P. Craig; Devegowda, Vani N.; Johansen, Ingar; Millett, John & Rosenqvist, Marija Plahter [Vis alle 8 forfattere av denne artikkelen] (2026). Fluid connectivity and evolution of pore water in breakup basalt offshore mid-Norway with implications for CO2 storage. doi: https:/ngwm2026.fi/conference-programme. Fulltekst i vitenarkiv
• Svensen, Henrik Hovland & Planke, Sverre (2025). Potensialet for lagring av CO2 i vulkanske bergarter i Norge. Fulltekst i vitenarkiv
• Tugend, Julie; Mohn, Geoffroy; Kusznir, Nick; Planke, Sverre; Berndt, Christian & Manton, Ben [Vis alle 8 forfattere av denne artikkelen] (2025). Palaeobathymetry of the Mid-Norwegian volcanic margin during continental breakup and paleoclimate implications. doi: 10.5194/egusphere-egu24-11873. Fulltekst i vitenarkiv Vis sammendrag

  The Mid-Norwegian volcanic rifted margin and its NE-Greenland conjugate formed in relation to continental breakup in the latest Palaeocene to earliest Eocene during the emplacement of the North Atlantic Igneous Province (NAIP). The development of the NAIP and opening of the North Atlantic occurred contemporaneous to the Paleocene Eocene Thermal Maximum (PETM) which corresponded to a rapid 5-6&#160;&#176;C global warming episode.The cause of this rapid global warming, explored as part of IODP Expedition 396, is thought to relate to the thermogenic gases released to the atmosphere via thousands of hydrothermal vents. The thermogenic gases were produced by contact metamorphism of carbon-rich sediments during widespread sill emplacement from the NAIP. The potential of hydrothermally-released greenhouse gases to influence climate depends strongly on the water depth at which they get released. Unless it is released in a shallow marine environment most methane will be oxidized before it reaches the atmosphere.Early results from IODP Expedition 396 have documented that at least one of the Mid-Norwegian hydrothermal vents was emplaced in shallow marine to potentially sub-aerial conditions. The aim of this contribution is to constrain further the paleo-water depth at which hydrothermal vents formed along the other parts of the mid-Norwegian volcanic rifted margin. This study focuses on an integrated workflow of quantitative geophysical and geodynamic analyses calibrated by new IODP drilling results and structural and stratigraphic observations. We use a 3D flexural-backstripping, decompaction and reverse thermal subsidence modelling to predict the palaeobathymetry and palaeostructure at keys stages of the syn- to post-breakup evolution that can be compared with palaeo-water depths estimated from biostratigraphic data. Results provide new constraints on the paleobathymetry of hydrothermal vent complexes required to confirm whether the global warming recorded by the PETM was triggered by the magma-rich continental breakup leading to the opening of the northeast Atlantic Ocean.&#160;

• Millett, John; Planke, Sverre; Jolley, David; Berndt, Christian; Betlem, Peter & Rosenqvist, Marija Plahter [Vis alle 9 forfattere av denne artikkelen] (2025). Characterizing lava flows in offshore North Atlantic boreholes: a review with implications for basalt carbon storage. doi: 10.5194/egusphere-egu24-12383. Fulltekst i vitenarkiv Vis sammendrag

  Widespread and large-scale volcanism associated with the North Atlantic Igneous Province (NAIP) erupted during the Paleocene and Early Eocene and covers vast regions of the conjugate North Atlantic rifted margins. The majority of the preserved volume occurs in the offshore sequences of the continental shelves of Greenland, the Faroe Islands, UK, and Norway. These vast mafic igneous rock volumes in the offshore NAIP have been proposed as a potential area for permanent CO2 storage. However, a wide range of factors influence the suitability of mafic rock masses to act as fluid reservoirs including perhaps most importantly the volcanic facies (and associated pore structure, permeability, and distribution), along with alteration state, fracturing, and reactivity. In this contribution we focus on assessing the nature, distribution, and reservoir potential of sub-aerial lava flows from available borehole data across the NAIP. Lava flows are chosen for focus as they represent the most favorable reservoir target identified to date whilst also often constituting the dominant facies within much of the accessible NAIP offshore sequences.Over 50 offshore boreholes have penetrated the lava sequences of the NAIP including both industry and scientific boreholes drilled from the 1970&#8217;s onwards. Boreholes have encountered anything from a single lava flow through to several 10&#8217;s of lava flows in volcanic sequences reaching over 2 km in cumulative thickness in the deepest industry wells such as Brugdan (6104/21-1) and Lagavulin (217/15-1z) in the Faroese and UK sectors respectively.A summary of the lava flow nature (simple, compound, thickness, core-crust ratios) and physical property ranges (P-wave velocity, density, resistivity) of the penetrated lava flow sequences is presented utilizing available core, sidewall core, wireline and drill cuttings data to support the facies appraisal.Borehole data and the level of possible interpretation vary significantly depending on the age, purpose, and importantly the drilling operations of the individual boreholes. Some of the most robust and complete datasets are represented by modern hydrocarbon industry boreholes, for example those from the Rosebank Field in the UK sector, and cored boreholes from recent IODP Expedition 396 drilling Mid-Norway. Results from Expedition 396 are presented to highlight formation evaluation approaches for NAIP lava flow sequences including assessing the effects of different lava flow facies on Net to Gross calculations and the impact of alteration and secondary alteration on wireline log responses.This study presents important new constraints on the nature, variability, and distribution of NAIP lava flows from extensive available borehole ground truth data forming a foundational study for the development of reservoir appraisal techniques in the province going forward.

• Rosenqvist, Marija Plahter; Dunkel, Kristina; Planke, Sverre; Nogueira, Liebert Parreiras; Polteau, Stephane & Menegon, Luca (2025). Porosity structures and local compositional variations associated with natural CO2 sequestration in basalts offshore Norway. doi: 10.5194/egusphere-egu25-11073. Fulltekst i vitenarkiv Vis sammendrag

  Permanent storage of CO2 as carbonates in basalt deposits utilises natural weathering reactions between silicate minerals and carbonic water. By studying how CO2-enriched water has altered basalt in 43 samples from the V&#248;ring Margin, offshore Norway, we demonstrate the pathways and reactions of CO2 within a basalt reservoir.The pore spaces occupied by carbonates in the samples were studied through &#956;-CT (computer tomography) studies on three minicores and detailed microanalyses on 32 thin sections via scanning electron microscopy (SEM), electron microprobe analysis, and electron backscatter diffraction (EBSD). Single crystal X-ray diffraction on 15 samples determined the type of carbonate minerals and precipitation ages were determined for two samples through U/Pb-radiomeric dating. &#948;18O and &#948;13C-isotope analyses were used to determine the fluid origin in 11 samples.Three types of carbonate precipitation were characterised based on the pore structures they fill and the associated mineralogy. Type I carbonates, seen in 18 thin sections, fills vesicles, mainly along lava flow margins. SEM analyses showed that all vesicles are initially coated with a smectite layer which incorporates most of the Mg2+ and Fe2+ from dissolving silicate minerals. As pH and Ca concentrations increase, calcite precipitates in some vesicles. The secondary mineral assemblage and precipitation order fit with low-temperature alteration of basalt with pore water and atmospherically balanced CO2 levels (pH&#8805;8). Type II carbonates appear in seven thin sections as

• Tugend, Julie; Mohn, Geoffroy; Kusznir, Nick, J.; Planke, Sverre; Berndt, Christian & Zastrozhnov, Dmitrii [Vis alle 7 forfattere av denne artikkelen] (2025). Paleo-depth of hydrothermal venting along the Mid-Norwegian volcanic margin during Paleogene continental breakup. doi: 10.5194/egusphere-egu25-10746. Fulltekst i vitenarkiv Vis sammendrag

  Volcanic rifted margins commonly form in association with the emplacement of Large Igneous Provinces. The intense associated volcanic activity coincides with shifts in the global carbon cycle and rapid climate change during several key geological periods and crises. The Mid-Norwegian and NE-Greenland conjugate rifted margins formed after late Paleocene to early Eocene continental breakup in association with the emplacement of the North Atlantic Igneous Province (NAIP). The NAIP and early opening of the North Atlantic occurred contemporaneous to a rapid 5-6&#160;&#176;C global warming episode known as the Paleocene Eocene Thermal Maximum (PETM). The rapid global warming documented during the PETM is hypothesized to result from the release of thermogenic gases into the atmosphere through thousands of hydrothermal vents. The gases were generated by contact metamorphism of carbon-rich sediments during the extensive sill emplacement from the NAIP. The potential climatic impact of these hydrothermally released greenhouse gases is dependent on the water depth at which they were released. Unless it is released in a shallow marine environment most methane, known for its significantly greater global warming potential compared to carbon dioxide, will be oxidized and dissolved in the ocean before it reaches the atmosphere.First results of IODP Expedition 396 conducted on the Mid-Norwegian volcanic margin have documented the shallow marine to potentially sub-aerial setting of at least one of the hydrothermal vents (i.e. Modgunn vent). However, a comprehensive regional assessment of the water depth at which hydrothermal venting occurred remains necessary to validate the overall impact on paleoclimate and the PETM. To do so, we apply 3D flexural-backstripping and decompaction to remove the loading effects of sedimentary sequences and determine the sediment-corrected bathymetry down to the top Palaeocene surface at which most of the vents are mapped. Reverse subsidence cannot be directly modelled without knowing the detailed distribution of syn- and post-rift thermal subsidence from Cretaceous and Paleocene rifting as well as any mantle plume dynamic uplift during NAIP emplacement. Because these tectonic and geodynamic components of subsidence cannot be deterministically predicted at the required accuracy, we use local palaeobathymetric constraints from seismic observations and drilled biostratigraphic data, combined with our flexural backstripping and decompaction results to calibrate palaeobathymetric variations of the Paleocene venting surface at the time of the PETM.Our results predict that hydrothermal venting occurred within a range of palaeo-water depths showing the complex palaeo-structure of the top Paleocene surface. Key post-Paleocene tectonic influences such as a well-documented Miocene doming episode influence the margin history, and hence, at this location, our palaeobathymetric results represent shallowest estimates and must be interpreted with caution. However, most of the vents (>80%) restore to bathymetries shallower than 500&#160;meters, i.e., in sub-aerial to shallow marine conditions. Our work aims to confirm and extend initial results of IODP Expedition 396 from the Modgunn vent. Shallow water-depth hydrothermal venting most likely occurred during magma-rich continental breakup and NAIP emplacement; a large part of the released hydrogenic gas could have directly contributed to the global warming recorded by the PETM.&#160;

• Galerne, Christophe; Sinha, Aniruddha; Bach, Wolfgang; Kahl, Wolf-Achim; Millett, John & Planke, Sverre (2025). Pore-fluid pressure assisted columnar joint initiation: a natural carbon trapping process revealed from IODP Expedition 396 basalt samples. doi: 10.5194/egusphere-egu25-20273. Fulltekst i vitenarkiv Vis sammendrag

  Extensive flood basalt sequences of the North Atlantic Igneous Province (NAIP) offshore Norway comprise promising sequestration reservoirs for permanent CO2 on the doorstep of Europe. However, a key question remains open: How much of the pore space is available at present for Carbon Capture and Sequestration (CCS) endeavours?We investigated carbonate vein and void mineral fills in drill core samples from IODP Expedition 396 which recovered over 350 m of basaltic stratigraphy, to untangle the formation conditions of the carbonates and the origin of the carbon. We examined two main scenarios: carbonates originating from 1) dissolved carbon in seawater, or from 2) thermogenic gas ascending from greater depths within the basin. Several driving mechanisms for this second scenario are explored: natural migration of light petroleum derived from burial and/or contact metamorphism associated with later sill emplacement at depth.We present results of carbon and oxygen isotope analyses of carbonate found distributed down section of the landward-flow volcanic sequence (Site U1566) and the outer seaward-dipping reflector (SDR) sequence of flows (Site U1573). Oxygen isotope thermometry suggests a range of formation temperatures between 50 and 160&#176;C. However, results from micro-CT textural analyses and petro-chemical analyses suggests that some carbonate originated from thermogenic gas at much higher temperature. We interpret these signatures as relating to the early nucleation of contractional cooling joints (columnar joint fractures) in the basaltic lava at the time of emplacement. Newly obtained carbon and oxygen isotopes from this type of carbonate will be presented and discussed.Our result suggests an alternative third scenario in which carbonate originating from below the flood basalts seals the porosity and reduces permeability in the lower section of the SDR sequence. Textural analysis indicates that thermogenic gases mobilized during lava flow emplacement assist in initiating and sealing columnar joint fractures. If confirmed, this process implies that the SDR lava flow sequence above the first lava flow may be relatively carbonate-free, as it is sealed off from post-emplacement thermogenic gas fluxes ascending from depth.

• Planke, Sverre; Berndt, Christian; Huismans, Ritske Sipke; Faleide, Jan Inge; Bünz, Stefan & Millett, John [Vis alle 8 forfattere av denne artikkelen] (2025). Understanding Volcanic Rifted Margins and Paleoclimate Implications from Scientific Drilling in the NE Atlantic. doi: https:/ui.adsabs.harvard.edu/abs/2024AGUFMPP44A..02P/abstract. Fulltekst i vitenarkiv
• Lebedeva-Ivanova, Nina N.; Bünz, Stefan; Berndt, Christian; Millett, John; Betlem, Peter & Zastrozhnov, Dmitry [Vis alle 9 forfattere av denne artikkelen] (2025). High-resolution 2D and 3D seismic imaging and core-log-seismic integration of seaward dipping reflectors on the Vøring volcanic rifted margin. doi: 10.5194/egusphere-egu25-12935. Fulltekst i vitenarkiv Vis sammendrag

  Offshore basalt flow sequences represent potential permanent CO2 sequestration sites along volcanic rifted margins. The International Ocean Discovery Program (IODP) Expedition 396 drilled six basement sites on the V&#248;ring volcanic margin in 2021, recovering more than 350 m of basaltic basement cores and 15 m of granite cores. The cores have been extensively analyzed following the IODP shipboard procedures (e.g., velocity, density, porosity, and magnetic susceptibility measurements). In addition, shore-based petrographic, geochemical, CT scanning, and multi-fluid permeability and flow measurements (nitrogen, brine, liquid and gaseous CO2) have been performed to assess reservoir properties. A standard suite of conventional wireline logs along with borehole image (acoustic and resistivity) logs were acquired in four holes. High-resolution 2D and locally 3D seismic reflection data have been acquired across all sites during three surveys (2020, 2022, and 2024) using R/V Helmer Hansen. In total, four HR3D P-Cable cubes with a total areal extent of 62 km2 and c. 2700 km of HR2D data have been collected. The seismic data are interpreted using the concepts of seismic volcanostratigraphy and igneous seismic geomorphology combined with conventional horizon interpretation and core-log-seismic integration. On the Skoll High, the igneous seismic geomorphology of the Top Basalt horizon reveals two distinct domains: a pitted surface in the west, and a faulted surface in the east. Cross-cutting faults and fracture systems are well imaged in borehole data and the 3D seismic data. Borehole data show that the Inner Seaward Dipping Reflectors (SDR) were emplaced in subaerial and coastal environments, including vesicular flow tops and deposition of inter-basalt volcaniclastic sedimentary horizons. Vesicles are observed to be both open or filled with carbonates and clay minerals within different layers, however, laboratory measured matrix permeability of mini-core plugs is typically low and in the milli to micro-darcy range; brine permeability measurements are indicating even lower. Multiple scales of fracturing are identified within the cores and image logs, and Strontium residual salt analysis revealed that they have an important impact on permeability by enhancing fluid communication between flows. In conclusion, the integrated interpretation suggests that the V&#248;ring Margin basalt sequences may have reservoir potential in fractured intervals and flow tops, but reservoir-scale injection testing linked to fracture network parameterization is required for large-scale assessment.

• Planke, Sverre; Bünz, Stefan; Berndt, Christian; Zarikian, Carlos A. Alvarez; Lebedeva-Ivanova, Nina N. & Stokke, Henrik Henriksen [Vis alle 18 forfattere av denne artikkelen] (2025). The Ocean-Continent Transition of the Northern Vøring Margin from New High-Resolution 2D Seismic and IODP Expedition 396 Data. Fulltekst i vitenarkiv
• Planke, Sverre (2025). Exploration history and opportunities in the Vøring volcanic basin. Fulltekst i vitenarkiv
• Bünz, Stefan; Planke, Sverre; Berndt, Christian; Lebedeva-Ivanova, Nina N.; Stokke, Henrik Henriksen & Binde, Cornelia Mentzoni [Vis alle 14 forfattere av denne artikkelen] (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. Fulltekst i vitenarkiv Vis sammendrag

  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

• Binde, Cornelia Mentzoni; Bünz, Stefan; Plaza-Faverola, Andreia; Planke, Sverre & Manton, Ben (2025). Hydrothermal vent complexes associated to the Infinity Sill, Vøring volcanic margin, offshore Norway. doi: https:/www.geologi.no/konferanser/vinterkonferanser/abstracts/file/298-abst-vk25. Fulltekst i vitenarkiv Vis sammendrag

  Hydrothermal vent complexes (HTVCs) are pipe‐like fluid conduits formed in response to metamorphism of organic‐rich sedimentary strata in contact aureoles, venting thermogenic gases at the paleo‐seafloor following hydrofracturing and fluid migration. In the Møre and Vøring basins, extensive sill complexes were emplaced as part of the North Atlantic Igneous Province during the rifting and initial opening of the Norwegian‐Greenland Sea, near the Paleocene‐Eocene transition (c. 56 Ma ago). Hundreds of HTVCs were formed along sill margins, and the temporal coincidence between hydrothermal venting and the Paleocene‐Eocene Thermal Maximum (PETM) suggest that thermogenic gas release from sill aureoles may have contributed to increased temperatures at the Paleocene‐Eocene transition. To better understand the relationship between igneous intrusions and the formation of hydrothermal vent complexes, we are analyzing the distribution, seismic characteristics and morphology of HTVCs associated with the Infinity Sill, a large, elongated sill located in the southern Vøring Basin. We are using a 15 000 km2 3D seismic dataset (courtesy of TGS) across the border of the Møre and Vøring volcanic basins. 79 individual HTVCs, with vent conduits originating at the Infinity Sill margins and/or locals highs/sill steps, have been identified and classified into: i) along‐margin vents, distributed along the sill margins, ii) mid‐sill vents, distributed above the interior of the sill, and iii) mini‐vents, with vent diameters < ~350 m. Key observations from our study include: i) HTVCs occur as individual, amalgamated or clustered vents, ii) vents terminate at different sub surface levels, commonly at or below the regional vent horizon (Near Top Paleocene), iii) the majority of vents have eye‐shaped upper vent morphologies, with domed vent material and internal vent infill reflections, and iv) along‐margin and mid‐sill vents are characterized by radial and concentric faulting. We find that the formation and distribution of hydrothermal vent complexes associated to the Infinity Sill likely reflect variations in sill geometry, fluid generation potentials and/or migration pathways in the sill aureole, ultimately controlling the upper vent termination, size, number and distance between HTVCs

• Polteau, Stephane; Smalley, Craig; Millett, John; Planke, Sverre; Rosenqvist, Marija Plahter & Devegowda, Vani [Vis alle 7 forfattere av denne artikkelen] (2025). Vertical fluid connectivity of basalt sequence assessed using strontium isotopes in pore waters. Fulltekst i vitenarkiv
• Polteau, Stephane; Craig, Smalley,; Millett, John; Planke, Sverre; Rosenqvist, Marija Plahter & V., Devegowda, [Vis alle 7 forfattere av denne artikkelen] (2025). The fluid connectivity of continental margin basalt sequences for CO2 storage revealed by strontium isotopes. Fulltekst i vitenarkiv
• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Vis alle 18 forfattere av denne artikkelen] (2025). Mimir High Core-log-seismic Integration. Fulltekst i vitenarkiv
• Planke, Sverre; Millett, John; Lebedeva-Ivanova, Nina N.; Bünz, Stefan; Jones, Morgan Thomas & Myklebust, R. (2024). Cretaceous and Paleogene Source Rock Potential on the Norwegian Atlantic Margin. doi: 10.3997/2214-4609.2024101502. Fulltekst i vitenarkiv
• Planke, Sverre; Berndt, Christian; Bünz, Stefan; Huismans, Ritske Sipke; Faleide, Jan Inge & Svensen, Henrik Hovland [Vis alle 11 forfattere av denne artikkelen] (2024). Understanding Volcanic Rifted Margins and Paleoenvironment by Scientific Drilling in the NE Atlantic. Fulltekst i vitenarkiv
• Planke, Sverre (2024). Potensialet for permanent CO2 lagring i vulkanske bergarter i Norskehavet. Fulltekst i vitenarkiv
• Planke, Sverre; Millett, John M.; Lebedeva-Ivanova, Nina; Bünz, Stefan; Jones, Morgan Thomas & Myklebust, Reidun (2024). Cretaceous and Paleogene Source Rock Potential on the Norwegian Atlantic Margin. Fulltekst i vitenarkiv
• Planke, Sverre (2024). Drilling volcanic rifted margins to understand large igneous provinces and associated global warming. Fulltekst i vitenarkiv
• Zastrozhnov, Dmitrii; Planke, Sverre; Millett, John; Horota, Rafael Kenji; Kontny, Agnes M. & Senger, Kim [Vis alle 12 forfattere av denne artikkelen] (2024). Quaternary Magmatism in NW Svalbard: Refining the Architecture and Evolution of Sverrefjellet Volcano. EGU General Assembly Conference Abstracts. doi: 10.5194/egusphere-egu24-6844. Fulltekst i vitenarkiv
• Zastrozhnov, Dmitrii; Planke, Sverre; Lebedeva-Ivanova, Nina N.; Millett, John M.; Bünz, Stefan & Binde, Cornelia Mentzoni [Vis alle 12 forfattere av denne artikkelen] (2024). The Tectonomagmatic Development of the Vøring Marginal High, Norwegian Sea: Core-log-seismic Integration of the IODP Expedition 396 Boreholes U1571 and 1572. Fulltekst i vitenarkiv
• Tugend, Julie; Mohn, Geoffroy; Kusznir, Nick; Planke, Sverre; Berndt, Christian & Manton, Ben [Vis alle 8 forfattere av denne artikkelen] (2024). Palaeobathymetry of the Mid-Norwegian volcanic margin during continental breakup and paleoclimate implications. EGU General Assembly Conference Abstracts. Fulltekst i vitenarkiv
• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Vis alle 24 forfattere av denne artikkelen] (2024). PALMAR – Paleogene Basin Development on the Vøring and Møre Margins. Fulltekst i vitenarkiv
• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Vis alle 24 forfattere av denne artikkelen] (2024). IODP Exp. 396 Drilling and High-Resolution 3D Seismic on the Mimir High. Fulltekst i vitenarkiv
• Nygaard, Madeleine Skov; Planke, Sverre; Berndt, Christian; Zastrozhnov, Dmitry; Faleide, Jan Inge & Jones, Morgan Thomas [Vis alle 11 forfattere av denne artikkelen] (2024). Characterization of the Vøring Transform Margin by IODP Exp. 396 Drilling and High-Resolution 3D Seismic on the Mimir High. Fulltekst i vitenarkiv
• Lu, Gang; Huismans, Ritske S.; May, Dave A. & Keller, Tobias (2024). On the causes of melt focusing at mid-ocean ridges. Fulltekst i vitenarkiv
• Planke, Sverre; Berndt, Christian; Zarikian, Carlos A. Alvarez; Bünz, Stefan; Zastrozhnov, Dmitrii & Lebedeva-Ivanova, Nina [Vis alle 10 forfattere av denne artikkelen] (2023). The Nature of Outer Highs on Volcanic Rifted Margins: Results from High-Resolution Seismic Data and IODP Drilling on the Vøring Margin, Norwegian Sea. Fulltekst i vitenarkiv
• Planke, Sverre; Lebedeva-Ivanova, Nina; Bünz, Stefan; Binde, Cornelia Mentzoni; Berndt, Christian & Faleide, Jan Inge [Vis alle 11 forfattere av denne artikkelen] (2023). High-resolution core-log-seismic integration and igneous seismic geomorphology of IODP Expedition 396 sites on the mid-Norwegian margin. Fulltekst i vitenarkiv
• Planke, Sverre; Christian, Berndt; Zarikian, Zarikian Alvarez; Huismans, Ritske Sipke; Bünz, Stefan & Faleide, Jan Inge [Vis alle 8 forfattere av denne artikkelen] (2023). Breakup Magmatism and Paleogene Paleoenvironment: Initial Results from IODP Expedition 396 on the Mid-Norwegian Continental Margin. Fulltekst i vitenarkiv
• Planke, Sverre (2023). Hva skjer på Island nå? [Radio]. NRK Studio 2. Fulltekst i vitenarkiv
• Zastrozhnov, Dmitrii; Planke, Sverre; Lebedeva-Ivanova, Nina N.; Millett, John M.; Bünz, Stefan & Binde, Cornelia Mentzoni [Vis alle 10 forfattere av denne artikkelen] (2023). The Paleogene Tectonomagmatic Development of the Vøring Marginal High, offshore mid-Norway. AGU Fall Meeting Abstr.. Fulltekst i vitenarkiv
• Lebedeva-Ivanova, Nina N.; Planke, Sverre; Millett, John; Bünz, Stefan; Binde, Cornelia Mentzoni & Manton, Ben M. [Vis alle 10 forfattere av denne artikkelen] (2023). Terrestrial Early Eocene Volcanic Paleoenvironment of the Skoll High, Mid-Norwegian Margin, Based on New High-Resolution 3D Seismic Geomorphology. EGU General Assembly. Fulltekst i vitenarkiv
• Planke, Sverre; Berndt, Christian; Zarikian, C. A. Alvarez; Bünz, Stefan; Lebedeva‐Ivanova, N. & Binde, Cornelia Mentzoni [Vis alle 15 forfattere av denne artikkelen] (2023). The Nature of Outer Highs on Volcanic Rifted Margins: Results from IODP Drilling of Eldhø on the Vøring Margin. Fulltekst i vitenarkiv
• Bünz, Stefan; Stokke, Henrik Henriksen; Lebedeva-Ivanova, Nina; Sokolkova, Elisaveta; Rohde, Lea & Nygaard, Madeleine Skov [Vis alle 13 forfattere av denne artikkelen] (2026). UiT-IG24-8 Cruise Report Leg 1 High-resolution 2D and 3D seismic investigations on the Vøring Margin. UiT Norges arktiske universitet. Fulltekst i vitenarkiv Vis sammendrag

  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)

• Binde, Cornelia Mentzoni & Bünz, Stefan (2026). Geometry and evolution of the Infinity Sill and associated hydrothermal vent complexes on the Mid-Norwegian continental margin. UiT Norges arktiske universitet. ISSN 9788282366878. Fulltekst i vitenarkiv Vis sammendrag

  Igneous sill intrusions are tabular sheets of igneous rock, found in large igneous provinces worldwide. Previous work has shown that such intrusions are important components of shallow crustal magmatic systems, facilitating magma transport over significant distances in the Earth’s crust and influencing petroleum systems in sedimentary basins. Moreover, sill intrusions are linked to environmental perturbations through their association with hydrothermal vent complexes, which are pipe-like fluid conduits that release fluids such as methane and carbon dioxide from contact metamorphic aureoles around intrusions. The release of such fluids to the hydrosphere and atmosphere has been proposed as a potential driver for global warming events such as the Paleocene-Eocene Thermal Maximum, but the mechanics and fluid dynamics of sill emplacement and hydrothermal venting remain subjects of ongoing debate. This thesis aims to advance our understanding of the geometry and evolution of igneous sill intrusions and hydrothermal vent complexes. This study is based on seismic characterization and analysis of a single sill, named the Infinity Sill, and its associated hydrothermal system, utilizing an extensive 3D seismic dataset from the Møre and Vøring volcanic margins, offshore Norway. The findings of this study are presented in three interconnected papers, each focusing on specific parts and processes associated with the sill-HTVC system. Paper I examines the characteristics, morphology and lateral evolution of the Infinity Sill, while Papers II and III investigate the distribution, characteristics and evolution of the sill’s associated hydrothermal vent complexes. This study enhances our understanding of magmatic emplacement in both space and time, as well as the processes, materials and timing associated with hydrothermal venting from sills. Understanding these processes may ultimately provide insights into the climatic impacts of major magmatic events, including the connection between the emplacement of the North Atlantic Igneous Province and the Paleocene-Eocene Thermal Maximum.

• Bünz, Stefan; Polteau, Stephane; Mazzini, Adriano; Ferré, Benedicte; Krueger, Martin & Trivedi, Akash [Vis alle 14 forfattere av denne artikkelen] (2026). UiT-IG25-7 Cruise Report. UiT Norges arktiske universitet. Fulltekst i vitenarkiv

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