Suprabasins Sedimentary Response to Growth of Major Extensional Fault Systems

• Janocha, Julian; Grundvåg, Sten-Andreas; Stemmerik, Lars; Olaussen, Snorre; Thomsen, Tonny B. & Stockli, Daniel F. [Vis alle 9 forfattere av denne artikkelen] (2026). Detrital zircon provenance of the Upper Devonian to Permian Billefjorden and Gipsdalen groups of Svalbard – influence of rifting on sediment routing and basin connectivity. Norwegian Journal of Geology. ISSN 2387-5844. 106(1), s. 1–48. doi: 10.17850/njg106-1-2. Fulltekst i vitenarkiv Vis sammendrag

  Provenance studies based on U–Pb dating of detrital zircons are routinely applied in basin analysis and source-to-sink studies to decipher ancient sediment pathways and the tectonic events that shaped them. The Norwegian Svalbard Archipelago, situated in the high Arctic, hosts a well-preserved upper Paleozoic sedimentary succession, deposited in the aftermath of the Caledonian Orogeny and influenced by shifting regional tectonics, which led to the formation of diverse sedimentary basins. The lower, clastic-dominated portion of the succession records a transition from extensive, pre-rift basins hosting Late Devonian–Mississippian strata (Billefjorden Group) to narrow, fault-bounded, north-south trending rift basins hosting middle Carboniferous–lowermost Permian strata (lower Gipsdalen Group). Despite its significance, the detrital zircon age signatures and sediment provenance of this succession have received limited attention. In this study, we present new detrital zircon age data from 41 samples spanning Late Devonian to lower Permian strata across all major late Paleozoic basins in Svalbard. We analyse the zircon age signatures of individual basin-fill successions and explore the role of regional and local tectonics in driving spatial and temporal changes in sediment provenance and routing during the late Paleozoic. Particular attention is given to the connectivity of pre-rift sedimentary basins, and shifts in provenance linked to the onset of localized rifting during the middle Carboniferous. Our data reveal significant provenance variability across the basins. Key findings include evidence of predominant sediment sourcing from northeastern Greenland during deposition of the Billefjorden Group (latest Devonian to Mississippian pre-rift phase). Similar zircon age signatures across the investigated basins suggest connectivity between pre-rift depocentres. The Billefjorden Trough shows signs of increasing isolation with continued rifting and subsidence. This study provides new insights into the post-Caledonian tectonosedimentary evolution of the region

• Dahlin, Anders; Lecomte, Isabelle; Senger, Kim; Smyrak-Sikora, Aleksandra Anna; Braathen, Alvar & Stemmerik, Lars (2025). Analysing lithological complexity in outcrop-scale seismic models of interbedded siliciclastics and carbonates from Svalbard. Marine and Petroleum Geology. ISSN 0264-8172. 181, s. 1–25. doi: 10.1016/j.marpetgeo.2025.107494. Fulltekst i vitenarkiv Vis sammendrag

  Thin sedimentary units typically constitute a large part of the volume of reservoirs targeted for hydrocarbons, CO2 storage, or groundwater but are considered to be below resolution thresholds of conventional seismic reflection data. Nonetheless, they affect seismic imaging through interference, and where lithology varies significantly over short distances, reflection characteristics may change laterally. This is especially valid for interbedded siliciclastic-carbonate systems characterised by lateral and vertical changes in lithology. We use high-resolution digital outcrop models of two interbedded siliciclastic-carbonate outcrops from Svalbard as input for seismic modelling using a 2D point-spread-function based convolution. The digital outcrop models show Carboniferous to Triassic strata, from southern Spitsbergen and Bjørnøya. We investigate detection thresholds (bed thickness, layer geometry, lithologic variability) and discuss their implications for resolvability on seismic data. Our base-case seismic models illustrate that units below the vertical resolution can be detected, even at high velocities (5–5.5 km/s). We present 6 scenarios to test the influence of thin (metre-scale) beds, lithological variability, faults, karstification, and imaging parameters on the seismic models. They illustrate that in mixed successions variations in reflection amplitudes, dimming and tuning effects become important for recognising thin units. Additionally, thin interfingering units can create artefacts such as apparent “faults”, thus leading to misinterpretation of seismic sections in this type of depositional setting. Varying seismic imaging parameters, such as adding random noise or reducing dominant frequency decrease the detectability of thin units.

• Maher, Harmon; Johnson, Ashley; Braathen, Alvar & Osmundsen, Per Terje (2025). Cataclastic Strain in the Footwall Rocks of the Mormon Point Turtleback, Death Valley. Lithosphere. ISSN 1941-8264. 2024(Special 15). doi: 10.2113/2024/lithosphere_2024_206. Fulltekst i vitenarkiv Vis sammendrag

  We explore an example of distributed brittle deformation in a core complex exposed in the Black Mountains of Death Valley in California, USA, and distinguish between cataclastic flow, common within fault zones, and a more general and inclusive phenomenon of cataclastic strain. In canyon traverses that cut hundreds of meters into footwall rocks within the Mormon Point turtleback slip surfaces are pervasive at the outcrop scale. Several relationships indicate most of the slip surfaces formed during and after turtleback formation. With slip surface densities typically greater than 1 per meter traverse and offsets from centimeters to meters, crude minimum estimates of bulk shear strain angle components range from ~10 to 60°, indicating a non-rigid footwall. While the kinematics are generally consistent with the established dextral transtensional environment, they vary considerably spatially. Local preferred orientations vary from shallowly to steeply dipping surfaces with the entire range of dip- to strike-slip movement. The variation suggests a domainal character to the cataclastic strain at outcrop and cliff-side scales. Internal strain within larger blocks bounded by larger-magnitude slip surfaces may be accommodated by distributed lower-magnitude slip. Earlier ductile fabrics in syn-kinematic intrusive rocks indicate a ductile to brittle transition in footwall deformation consistent with the known exhumation history. In Sheep Canyon, a marble tectonite zone separates footwall rocks of the Copper Canyon turtleback to the northeast with significantly less cataclastic strain from those of the Mormon Point turtleback to the southwest which have an abundance. Such spatial variation of footwall cataclastic strain as a function of core complex geometry and lithology may be an important phenomenon in some core complexes and in other settings and is worth further investigation.

• Dahlin, Anders; Blinkenberg, Kasper Høj; Braathen, Alvar; Olaussen, Snorre; Senger, Kim & Smyrak-Sikora, Aleksandra Anna [Vis alle 7 forfattere av denne artikkelen] (2024). Late syn-rift to early post-rift basin fill dynamics of a mixed siliciclastic-carbonate succession banked to a basement high, Hornsund, southwestern Spitsbergen, Arctic Norway. Basin Research. ISSN 0950-091X. 36(4). doi: 10.1111/bre.12880. Fulltekst i vitenarkiv Vis sammendrag

  The transition from syn-rift to post-rift sedimentation in rift basins is difficult to characterize in terms of stratigraphic architecture and dominating control on sedimentation, due to decreasing tectonic activity interplaying with regional subsidence, eustatic sea level changes, and differential compaction of underlying syn-rift sediments. Our case study of the Late Palaeozoic Inner Hornsund Fault Zone targets late syn-rift strata recorded in the (?Pennsylvanian – ?lower Permian) Treskelodden Formation in Hornsund, southern Spitsbergen, representing a mixed siliciclastic-carbonate succession, with siliciclastics primarily sourced from the adjacent Sørkapp-Hornsund High. We document local scale (<10 km) facies variability, sequence stratigraphy, and evolution of a succession deposited along a flank of the structural high during the late syn-rift stage. We observe that during the transition towards rift termination (glacio-)eustatic sea level changes and overall regional flooding became a more prominent forcing factor controlling sedimentation. Our dataset includes sedimentary logs, microfacies analysis, and high-resolution digital outcrop models. We identify four progressively backstepping stratigraphic sequences, reflecting an evolution from (1) terrestrial siliciclastics through (2–3) nearshore mixed siliciclastic–carbonates, to (4) carbonate ramp deposits. On the small scale (<5 m) the internal sediment cyclicity of the succession was formed by autogenic processes, particularly the changing rate of sediment input from the southwestern source area (the uplifted Sørkapp-Hornsund basement high). On the larger scale (10s of m), the importance of glacio-eustatic sea-level changes, driven by waxing and waning of ice caps in the southern hemisphere (Gondwana), increased as the rift-related tectonics decreased. The interdisciplinary methods used in this study provide new knowledge of the Middle Pennsylvanian to Permian depositional evolution in southern Spitsbergen, besides a novel framework for comparison to adjacent basins in the region and similar basins elsewhere.

• Blinkenberg, Kasper H.; Rameil, Niels; Hodgskiss, Malcolm; Polonio, Israel; Riber, Lars & Gianotten, Ingrid Piene [Vis alle 9 forfattere av denne artikkelen] (2024). Widespread dolomite recrystallization and porosity modification of upper Permian Zechstein carbonates, Symra discovery, Utsira High, Norwegian North Sea. Marine and Petroleum Geology. ISSN 0264-8172. 170. doi: 10.1016/j.marpetgeo.2024.107064. Fulltekst i vitenarkiv
• Janocha, Julian; Grundvåg, Sten-Andreas & Stockli, Daniel (2024). The Upper Devonian to Lower Carboniferous Billefjorden Group on Bjørnøya, Svalbard, and Its North-Eastern Greenlandic Provenance. Basin Research. ISSN 0950-091X. 36(6). doi: 10.1111/bre.70009. Fulltekst i vitenarkiv Vis sammendrag

  In this contribution, we document changes in detrital zircon ages in the upper Devonian (Famennian) to lower Carboniferous (Mississippian) Billefjorden Group on Bjørnøya, the southernmost island of Svalbard. This alluvial, coal-bearing clastic succession is widely distributed across the archipelago and the Barents Shelf. The sediments were deposited in subsidence-induced lowlands that formed just after regional post-Caledonian collapse-related extension, which created the classical ‘Old Red Sandstone’ basins during the Devonian, and prior to localised rift-basin development in the middle Carboniferous (Serpukhovian–Moscovian). Moreover, the succession is little affected by Ellesmerian compressional deformation, which occurred in the latest Devonian. However, little is known of the provenance and regional sediment routing in this tectonically transitional period between the post-Caledonian structuring events in the Devonian and the middle Carboniferous rifting. It has previously been invoked that a regional fault running parallel to the western Barents Shelf margin, the West Bjørnøya Fault, controlled sedimentation in the area. Here, we combine detrital zircon U–Pb ages and sedimentological data to investigate stratigraphic provenance variations and test whether tectonics controlled deposition of the Billefjorden Group on Bjørnøya. Sedimentological investigations demonstrate changes in fluvial style with intercalations between successions dominated by meandering channel fills and abundant overbank fines to sandstone-dominated sheet-like successions of braided stream origin. Palaeocurrent data show that two competing drainage directions accompany the changes in fluvial architecture. Northeasterly transport directions, recorded in the braided stream deposits, indicate possible fault-transverse drainage. The detrital zircon content in these deposits indicates sourcing from Caledonian terranes in Northeast Greenland. Northwest-oriented transport directions, measured in the meandering channel deposits, are inferred to represent axially positioned drainage systems. These may have been sourced from either Northeast Greenland, a more localised source, or Baltica. The latter would require long-distance sourcing, which, given the tectonic setting of the region, seems unlikely. Although our sedimentological observations point to syn-tectonic deposition, this is not clearly captured in the detrital zircon data, suggesting a common source for the Late Devonian–Mississippian fluvial systems of Bjørnøya. Thus, combined with previously published provenance data from Svalbard and Greenland, we demonstrate that the East Greenland Caledonides formed a long-lived and significant source area which provided sediments to nearby basins from the Devonian to the Early Cretaceous

• Janocha, Julian; Wesenlund, Fredrik; Thießen, Olaf; Grundvåg, Sten-Andreas; Koehl, Jean-Baptiste Philippe & Johannessen, Erik (2024). Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf. Marine and Petroleum Geology. ISSN 0264-8172. 163. doi: 10.1016/j.marpetgeo.2024.106768. Fulltekst i vitenarkiv Vis sammendrag

  Upper Palaeozoic strata are potential sources for hydrocarbon plays on the Norwegian Barents Shelf. The island of Bjørnøya (Bear Island) is located on the western margin of the Barents Shelf and represents an exposed part of the Stappen High, which makes it an excellent location to investigate the source rock potential of this succession. Here, we investigate the organic geochemical composition and source rock potential of coals and organic-rich mudstones of Late Devonian to middle Permian ages. The thermal maturity of the analysed samples ranges from mature to overmature with some samples being in the late oil generation window, and thus exhibiting higher maturities than age and facies equivalent strata in central Spitsbergen in the NW corner of the Barents Shelf and on the Finnmark Platform to the south. The high maturities and thermal cracking may thus have negatively affected the applied isoprenoid and biomarker-based source facies parameters, which potentially inhibit correct source facies interpretation. However, our results and comparisons with previous studies indicate that the vitrinite- and inertinite-dominated humic coals occurring in the lower part of the succession formed by the accumulation of peat in fluvially-influenced, humid wetlands at paleo-equatorial latitudes during a pronounced episode of rifting in the Late Devonian (Famennian) to earliest Carboniferous (Mississippian). Our source rock evaluation indicates a good potential for liquid hydrocarbon generation for the coals of the Upper Devonian Røedvika Formation prior to maturation. The oil-prone organic matter of these coals is primarily considered as terrestrial and non-aqueous. Because of renewed rifting in the middle Carboniferous combined with a shift to arid climatic conditions, as well as an environmental change from dominantly terrestrial and marginal marine clastic to marine carbonate platform environments, the accumulation of wetland peats effectively came to an end. Thus, the overlying Carboniferous and Permian strata generally seems to yield poor to no hydrocarbon generation potential

• Smelror, Morten; Olaussen, Snorre; Dumais, Marie-Andrée; Grundvåg, Sten-Andreas & Abay, Tesfamariam Berhane (2023). Northern Svalbard Composite Tectono-Sedimentary Element. Geological Society of London Memoirs. ISSN 0435-4052. 57. doi: 10.1144/M57-2023-2. Fulltekst i vitenarkiv Vis sammendrag

  The Northern Svalbard Composite Tectono-Sedimentary Element (CTSE) comprises Proterozoic, Early Paleozoic, and Devonian sedimentary rocks preserved in northern Svalbard and on the adjacent shelf margin. Here, the sedimentary strata of the CTSE are preserved between complexes of metamorphic and crystalline basement rocks. The Northern Svalbard CTSE covers four main tectonostratigraphic elements: Tonian syn-rift, Neoproterozoic to Cambrian post-rift, Ordovician passive margin, and late Silurian?/Devonian syn-extensional basins. The oldest documented sedimentary strata are greywacke and shale deposited after the Greenvillian Orogeny and assumed to be younger than 980-960 Ma. The present CTSE further includes Cambrian-Ordovician sedimentary rocks in Ny-Friesland and Nordaustlandet, while the dominant part of the CTSE are continental Old Red Sandstone sediments of the late Silurian?/Early Devonian Red Bay and Siktefjellet groups and the Early-Late Devonian Andreé Land Group onshore northern Spitsbergen. Locally, the Cambrian-Ordovician formations contain petroleum source rocks with moderate total organic carbon contents and relatively high hydrogen index values, suggesting a good potential for oil generation. There are possible reservoirs, seals, and traps in some of the basins, but the CTSE generally holds a very limited potential as a petroleum province, particularly as the region is under strict environmental protection

• López, Josep Puig; Howell, John; Roetzel, Reinhard & More, Miquel Poyatos (2023). Transgressive rocky coasts in the geological record: Insights from Miocene granitic rocky shorelines and modern examples. Sedimentary Geology. ISSN 0037-0738. 446. doi: 10.1016/j.sedgeo.2023.106344. Fulltekst i vitenarkiv
• Maher, Harmon; Braathen, Alvar; Ganerød, Morgan; Myhre, Per Inge; Osmundsen, Per Terje & Redfield, Thomas Fitzmaurice (2023). Discussion on ‘Paleozoic sedimentation and Caledonian terrane architecture in NW Svalbard: indications from U–Pb geochronology and structural analysis’ by Koglin et al. 2022 (JGS, 179, jgs2021-053). Journal of the Geological Society. ISSN 0016-7649. 180(4). doi: 10.1144/jgs2022-179. Fulltekst i vitenarkiv
• Pera, Emilia Le; Tangari, Anna Chiara; Marinangeli, Lucia; Morrone, Consuele; Riber, Lars & Andò, Sergio (2023). PROVENANCE OF MODERN SANDS FROM BAJA CALIFORNIA RIVERS (MEXICO): PETROGRAPHIC CONSTRAINTS FROM LIGHT AND HEAVY MINERALS. Journal of Sedimentary Research. ISSN 1527-1404. 93(9), s. 617–641. doi: 10.2110/jsr.2022.052. Fulltekst i vitenarkiv
• López, Josep Puig; Poyatos-Moré, Miquel & Howell, John (2023). Facies analysis and sequence stratigraphy of shallow marine, coarse-grained siliciclastic deposits in the southern Utsira High: The Late Jurassic intra-Draupne Formation sandstones in the Johan Sverdrup Field (Norwegian North Sea). Basin Research. ISSN 0950-091X. 00, s. 1–29. doi: 10.1111/bre.12833. Fulltekst i vitenarkiv
• Betlem, Peter; Rodes, Nil; Birchall, Thomas; Dahlin, Anders; Smyrak-Sikora, Aleksandra & Senger, Kim (2023). Svalbox Digital Model Database: A geoscientific window into the High Arctic. Geosphere. 19(6), s. 1640–1666. doi: 10.1130/GES02606.1. Fulltekst i vitenarkiv Vis sammendrag

  Digital outcrop models (DOMs) have revolutionized the way twenty-first century geoscientists work. DOMs are georeferenced three-dimensional (3-D) digital representations of outcrops that facilitate quantitative work on outcrops at various scales. Outcrop digitalization has been traditionally conducted using laser scanners, but in the past decade, it has seen an exponential growth because of efficient and consumer-friendly structure-from-motion (SfM) algorithms concurrent with the rapid development of cost-effective aerial drones with high-resolution onboard cameras. While DOMs are routinely used in geoscientific research, education, and industry, enhanced DOM usage is restricted because raw data (e.g., photographs) and metadata are often incomplete and/or unavailable. In this contribution, we present the Svalbox Digital Model Database (Svalbox DMDb), a database of metadata and openly available data packages for individual DOMs. The Svalbox DMDb is a regional DOM database geographically constrained to the Norwegian High Arctic archipelago of Svalbard at 74°N–81°N and 10°E–35°E. Svalbard offers exceptional-quality, vegetation-free outcrops with a wide range of lithologies and tectono-magmatic styles, including extension, compression, and magmatism. Data and metadata of the systematically digitalized outcrops across Svalbard are shared according to FAIR principles through the Svalbox DMDb. Fully open-access and downloadable DOMs include not just the DOMs themselves, but also the input data, processing reports and projects, and other data products such as footprints and orthomosaics. Rich metadata for each DOM include both the technical and geological parameters (metadata), enabling visualization and integration with regional geoscientific data available through the Norwegian Polar Institute and the Svalbox online portal. The current release of Svalbox DMDb, documented in this contribution, covers 135 DOMs cumulatively covering 114 km2 of Proterozoic to Cenozoic stratigraphy.

• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron, Gwenn (2023). Footwall geomorphology during necking domain evolution: A new model for the Frøya High, mid-Norwegian rifted margin. Basin Research. ISSN 0950-091X. 35(5), s. 1815–1839. doi: 10.1111/bre.12775. Fulltekst i vitenarkiv Vis sammendrag

  Observations and modelling results from highly extended regions indicate that detachment fault systems recording displacements of 10 km or more become associated with footwall uplift and back-rotation. This is commonly explained by the rolling hinge model, which predicts detachment fault back-rotation and severe dip reduction (<20°) controlled by the amount of extension. Although detachment faults within necking domains at rifted margins often record displacements in orders consistent with those for the rolling hinge model, it is rarely invoked to explain the associated footwall configurations. Our study area encircles the necking domain of the mid-Norwegian rifted margin, where the Middle Jurassic–Early Cretaceous Klakk Fault Complex (KFC) directly separates the Frøya High from the Rås Basin. The Frøya High represents the eroded footwall of the KFC detachment fault system which records displacements of 20–40 km. Seismic mapping and well correlation across the Frøya High reveal how three erosional unconformities correspond to three laterally extensive top basement segments which follow the strike of the sinuous KFC. The segments differ in terms of dip, basement geomorphology and the composition and age of the sediments that rest unconformably on the top of basement. We attribute the associated cross-cutting basement unconformities across the Frøya High to footwall uplift and back-rotation during fluctuating relative sea-level and repeated subaerial exposure during Middle Jurassic–Early Cretaceous times. We herein introduce a revised tectono-sedimentary model for the evolution of the Frøya High, with significant implications for sediment (re-)routing across the high during rifting. The model indicates that spatio-temporal sediment distribution was ultimately controlled by the process of necking and evolution of the KFC. Our findings indicate a rolling hinge-type evolution for the KFC and further suggest that the associated mechanisms may be more common in the necking domains of rifted margins than previously assumed.

• Osmundsen, Per Terje; Svendby, Anne Kathrine; Braathen, Alvar; Bakke, Beate & Andersen, Torgeir Bjørge (2023). Fault growth and orthogonal shortening in transtensional supradetachment basins: Insights from the `Old Red´ of western Norway. Basin Research. ISSN 0950-091X. 35(4), s. 1407–1432. doi: 10.1111/bre.12759. Fulltekst i vitenarkiv Vis sammendrag

  For basins that evolve adjacent to large-magnitude normal faults, tectonic controls on sedimentation involve isostatic back rotation of an exhuming footwall and, commonly, the evolution of kilometre-scale extension-parallel folds. Based on observations from classic localities in western Norway, we propose a three-stage evolution scenario for transtensional supradetachment basins where the basins become progressively re-arranged because of core complex exhumation and subsequent orthogonal shortening. Extension-parallel transverse synclines initially form due to a normal displacement gradient, but when displacements accumulate beyond a certain magnitude, the hanging wall increasingly responds to core complex exhumation and the original depocentre, formed close to the original area of maximum displacement, will become inverted and dismembered above the core complex. Two new synclinal depocentres will develop along the flanks. Because these synclines form by extensional fault growth rather than by shortening, they will be associated with widening of the basin and onlap onto basement at high angles to the maximum elongation trend with overall grain-size decrease and retrogradational stacking patterns. Further, because these synclines grow away from the evolving core complex, sedimentary units will become asymmetrically distributed inside each syncline in such a way that the oldest deposits in the syncline will be preserved on the flank most proximal to the core complex. In transtensional environments, a third evolutionary stage may involve constrictional strain where extension-parallel folds and reverse faults produced by orthogonal shortening enhance or interact with other structures. Ultimately, initial extensional sub-basins may become warped across extension-parallel folds. Hanging wall deformation will be manifested in shifting accommodation patterns, with depocentres that generally migrate in the direction of the detachment fault. Accommodation patterns initially related to megafault growth may conceptually evolve into depocentres controlled by orthogonal shortening.

• Horota, Rafael Kenji; Senger, Kim; Rodes, Nil; Betlem, Peter; Smyrak-Sikora, Aleksandra & Jonassen, Marius Opsanger [Vis alle 8 forfattere av denne artikkelen] (2023). West Spitsbergen fold and thrust belt: A digital educational data package for teaching structural geology. Journal of Structural Geology. ISSN 0191-8141. 167. doi: 10.1016/j.jsg.2022.104781. Fulltekst i vitenarkiv Vis sammendrag

  The discipline of structural geology is taking an advantage of compiling observations from multiple field sites to comprehend the bigger picture and constrain the region's geological evolution. In this study we demonstrate how integration of a range of geospatial digital data sets that relate to the Paleogene fault and thrust belt exposed in the high Arctic Archipelago of Svalbard, is used in teaching in bachelor-level courses at the University Centre in Svalbard. This event led to the formation of the West Spitsbergen Fold and Thrust Belt and its associated foreland basin, the Central Spitsbergen Basin. Our digital educational data package builds on published literature from the past four decades augmented with recently acquired high-resolution digital outcrop models, and 360° imagery. All data are available as georeferenced data containers and included in a single geodatabase, freely available for educators and geoscientists around the world to complement their research and fieldwork with course components from Svalbard.

• Grundvåg, Sten-Andreas; Strand, Mathias; Paulsen, Christian Oen; Simonsen, Bjørn Tore; Røstad, Jostein & Mørk, Atle [Vis alle 7 forfattere av denne artikkelen] (2023). The Hambergfjellet Formation on Bjørnøya – sedimentary response to early Permian tectonics on the Stappen High. Norwegian Journal of Geology. ISSN 2387-5844. 103. doi: 10.17850/njg103-1-2. Fulltekst i vitenarkiv Vis sammendrag

  On Bjørnøya, the exhumed crest of the Stappen High, the lower Permian (Cisuralian) Hambergfjellet Formation represents the only exposed part of the Bjarmeland Group carbonate platform, which occurs widely elsewhere in the subsurface of the Barents Shelf. A complex stratigraphic architecture has earlier been noted for the Hambergfjellet Formation and thickness estimates range from c. 50 to more than 100 m. Moreover, the unit lacks a formal type section, which hampers accurate regional correlations and comparisons. In this stratigraphic study, we integrate new field observations and microfacies analysis with data from previous work to present a composite section which is proposed as the type section for the Hambergfjellet Formation. Four internal units are recognized. Units A and B (post ?late Asselian–?Sakmarian), which consist of mixed carbonate and siliciclastic rocks interpreted to be of shallow marine origin, are restricted to a series of fault-bounded basins defined by gently rotated basement fault blocks. Locally, units A and B onlap or truncate lowermost Permian strata and appear to transgressively fill in antecedent topography presumably created during Sakmarian uplift and erosion of the Stappen High. The distorted character of unit A suggests that slumping was an important process during the initial phase of infilling, amid or soon after transgression. Unit C (?Sakmarian–?early Artinskian) is a thick-bedded, sheet-like limestone unit which contains fauna elements consistent with deposition on a warm-water carbonate platform occasionally subject to subaerial exposure. Unit D (late Artinskian) is a brachiopod-dominated, fusulinid-bearing, bioclastic limestone unit deposited on a fully marine, transitional warm-temperate to cool-water carbonate platform which developed during a late Artinskian circum-Arctic transgression. The unit only occurs in the eastern part of the outcrop belt on southern Bjørnøya due to fault-controlled tilting and peneplanation prior to deposition of the Miseryfjellet Formation (Kungurian–Wordian) limestones. Distinct evidence, including breccia pipes, points to prolonged exposure and karstification of the Hambergfjellet Formation carbonate platform prior to transgression and submergence of the Stappen High in the middle to late Permian (Guadalupian). The presence of angular and highly diachronous unconformities at the base and top of the formation, a series of small grabens, internal dip variations, as well as a conspicuous north to north-eastward thinning manifest tectonism pre-dating the late Permian extensional event along the western Barents Shelf margin. As such, we shed a new light on the Permian tectonostratigraphic evolution of the Stappen High.

• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron, Gwenn (2023). 3D Evolution of Detachment Fault Systems in Necking Domains: Insights From the Klakk Fault Complex and the Frøya High, Mid-Norwegian Rifted Margin. Tectonics. ISSN 0278-7407. 42(3). doi: 10.1029/2022TC007600. Fulltekst i vitenarkiv Vis sammendrag

  Detachment fault systems typically record displacements in the order of 10s of kilometers. The principles that control the growth of smaller magnitude normal faults are not fully applicable to the evolution of detachment fault systems. We use interpretation of 2D and 3D seismic reflection data from the mid-Norwegian rifted margin to investigate how the structural evolution of a detachment fault interacted with the effects of isostatic footwall rollback to produce complex 3D geometries and control the configuration of associated supradetachment basins. We further investigate the effects of lateral interaction and linkage of extensional detachment faults on the necking domain configuration. In our study area, the domain-bounding Klakk Fault Complex demonstrates how successive incision may induce a complex structural relief in response to faulting and fault plane folding. We interpret the previously proposed metamorphic core complex within its footwall as an extension-parallel turtleback-structure. The now eroded turtleback is flanked by a major supradetachment basin, connecting two main basin segments. We attribute footwall- and turtleback exhumation to Middle Jurassic - Early Cretaceous rifting. The study area further demonstrates how detachment fault geometries can change during rifting and lead to the formation of younger, successively incising fault splays. Lateral linkage between the original detachment fault plane and these fault splays enables displacement along a detachment fault system consisting of fault segments generated at different stages in time. Implicitly, detachment faults are complex 3D systems that change configuration during their evolution, perpetually controlling associated basin formation, footwall configuration, subsidence and uplift patterns.

• Stemmerik, Lars; Blinkenberg, Kasper H.; Gianotten, Ingrid P.; Hodgskiss, Malcolm; Lepland, Aivo & Paiste, Päärn [Vis alle 9 forfattere av denne artikkelen] (2023). STRATIGRAPHIC FRAMEWORK FOR ZECHSTEIN CARBONATES ON THE UTSIRA HIGH, NORWEGIAN NORTH SEA. Journal of Petroleum Geology. ISSN 0141-6421. 46(3), s. 257–273. doi: 10.1111/jpg.12838. Fulltekst i vitenarkiv Vis sammendrag

  The preserved Zechstein succession on the Utsira High in the NE part of the Norwegian North Sea is 25-100 m thick and is dominated by shelf carbonates. Internal subdivision of the succession is based on the recognition of key surfaces in petrophysical logs and cores, and suggests that the carbonates mainly consist of ZS2 and ZS3 deposits and that younger ZS4 and ZS5 deposits are only locally preserved. The carbonates have undergone early, syn-depositional dolomitization followed by later dolomite recrystallization and calcitization. Calcitization, interpreted as dedolomitization, is restricted to the upper part of the ZS3 carbonate unit and based on U/Pb dating took place during the Triassic, with a later phase of recrystallization linked to mid-Jurassic uplift. Both dedolomitization and dolomite recrystallization relate to fresh-water infiltration with the resetting of δO18 values prior to the Late Jurassic drowning of the Utsira High. The reservoir quality of the carbonates is directly linked to post-depositional meteoric diagenesis, and the best reservoir properties are recorded in intervals dominated by recrystallized dolomites in ZS2 and lower ZS3 carbonates. Dedolomitization significantly reduced porosity in the upper ZS3 carbonates.

• Olaussen, Snorre; Grundvåg, Sten-Andreas; Senger, Kim; Anell, Ingrid; Betlem, Peter & Birchall, Thomas [Vis alle 15 forfattere av denne artikkelen] (2023). Svalbard Composite Tectono-Sedimentary Element, Barents Sea”. Geological Society of London Memoirs. ISSN 0435-4052. 57. doi: 10.1144/M57-2021-36. Fulltekst i vitenarkiv Vis sammendrag

  The Svalbard Composite Tectono-Sedimentary Element (SCTSE) is located on the northwestern corner of the Barents Shelf and comprises a Carboniferous–Pleistocene sedimentary succession. Due to Cenozoic uplift, the succession is subaerially exposed in the Svalbard archipelago. The oldest parts of the succession consist of Carboniferous–Permian mixed siliciclastic, carbonate and evaporite, and spiculitic sediments that developed during multiple phases of extension. The majority of the Mesozoic succession is composed of siliciclastic deposits formed in sag basins and continental platforms. Episodes of Late Jurassic and Early Cretaceous contraction are evident in the eastern part of thearchipelago and in nearby offshore areas. Differential uplift related to the opening of the Amerasian Basin and the Cretaceous emplacement of the High Arctic Large Igneous Province created a major hiatus spanning from the Late Cretaceous and early Danian throughout the SvalbardCTSE. The West Spitsbergen Fold and Thrust Belt and the associated foreland basin in central Spitsbergen (Central Tertiary Basin) formed as a response to the Eurekan Orogeny and the progressive northward opening of the North Atlantic during the Paleogene. This event was followed by the formation of yet another major hiatus spanning the Oligocene–Pliocene. Multiple reservoir and source-rock units exposed in Svalbardprovide analogues to the prolific offshore acreages in the SW Barents Sea, and are important for the de-risking of plays and prospects. However, the archipelago itself is regarded as a high-risk acreage for petroleum exploration. This is due to Paleogene contraction and late Neogene uplift of the western and central parts in particular. There is an absence of mature source rocks in the east, and the entire region is subjected to strict environmental protection

• Olaussen, Snorre; Grundvåg, Sten-Andreas; Senger, Kim; Anell, Ingrid; Betlem, Peter & Birchall, Thomas [Vis alle 15 forfattere av denne artikkelen] (2022). The Svalbard Carboniferous to Cenozoic Composite Tectono-Stratigraphic Element. Geological Society of London Memoirs. ISSN 0435-4052. 57(1). doi: 10.1144/M57-2021-36. Fulltekst i vitenarkiv Vis sammendrag

  The Svalbard Composite Tectono-Stratigraphic Element is located on the north-western corner of the Barents Shelf and comprises a Carboniferous to Pleistocene sedimentary succession. Due to Cenozoic uplift the succession is subaerially exposed in the Svalbard archipelago. The oldest parts of the succession consist of Carboniferous to Permian mixed siliciclastic, carbonate and evaporite and spiculitic sediments that developed during multiple phases of extension. The majority of the Mesozoic succession is composed of siliciclastic deposits formed in sag basins and continental platforms. Episodes of Late Jurassic and Early Cretaceous contraction are evident in the eastern partof the archipelago and in nearby offshore areas. Differential uplift related to the opening of the Amerasian Basin and the Cretaceous emplacement of the High Arctic Large Igneous Province created a major hiatus spanning from the Late Cretaceous and early Danian throughout the Svalbard Composite Tectono-Stratigraphic Element

• Würtzen, Camilla Louise; Braathen, Alvar; Poyatos-Moré, Miquel; Mulrooney, Mark Joseph; Line, Lina Hedvig & Midtkandal, Ivar (2022). Impact of faulting in depocentres development, facies assemblages, drainage patterns, and provenance in continental half-graben basins: An example from the Fanja Basin of Oman. Basin Research. ISSN 0950-091X. 00, s. 1–39. doi: 10.1111/bre.12731. Fulltekst i vitenarkiv Vis sammendrag

  Fault throw gradients create transverse folding, and this can influence accommodation creation and sedimentary routing and infill patterns in extensional half-graben basin. The Fanja half-graben basin (Oman) offers an excellent outcrop of an alluvial fan succession displaying cyclical stacking and basin-scale growth-fold patterns. These unique conditions allow for an investigation of fault-timing and accommodation development related to fault-transverse folding. Our study combines geological mapping, structural analysis, sedimentary logging and correlation, and bulk mineralogical compositions. Mapping reveals that the basin is bounded by a regional-scale fault, with local depocentres changing position in response to transverse syncline and anticline development ascribed to fault-displacement gradients. The alluvial Qahlah Formation (Late Cretaceous) is unconformably overlying the Semail Ophiolite, and is in turn overlain by the marine Jafnayn Formation (Late Palaeocene). Facies and stratigraphic analysis allows for subdivision of the Qahlah Formation into four informal units, from base to top: (i) laterite in topographic depressions of the ophiolite, (ii) greenish pebbly sandstones, deriving from axially draining braided streams deposited in the low-relief half-graben basin. This green Qahlah grades vertically into the red Qahlah, formed by alluvial fanglomerates and floodplain mudstones, with drainage patterns changing from fault-transverse to fault-parallel with increasing distance to the main fault. The red Qahlah can be divided into (iii) the Wadi al Theepa member, found in a western basin depocentre, with higher immaturity and sand: mud ratio, suggesting a more proximal source, and (iv) the Al Batah member, located in the eastern part of the basin. The latter shows better sorting, a lower sand: mud ratio, and more prominent graded sub-units. It also shows eastward expansion from an orthogonal monocline, ascribed to accommodation developed in a relay ramp. Changes in sedimentary facies and depositional patterns are consistent with differential mineralogical composition. The Green Qahlah is composed of quartz and lithic mafic rock fragments, sourced from the ophiolite and schists of the metamorphic basement. The Red Qahlah is composed of chert and kaolinite sourced from the Hawasina Nappe succession in the footwall of the master fault. These changes in source area are linked to unroofing of fault-footwalls and domal structures during the extensional collapse of the Semail Ophiolite. The novelty of this study resides in linking sedimentology and fault-displacement events controlling fault-perpendicular folding, and its influence on depocentre generation and stratigraphic architecture. This is an approach seldom considered in seismic analysis, and rarely analysed in outcrop studies, thus placing the results from this study among the key outcrop-based contributions to the field.

• Serck, Christopher Sæbø; Braathen, Alvar; Hassaan, Muhammad; Faleide, Jan Inge; Riber, Lars & Messager, Grégoire [Vis alle 7 forfattere av denne artikkelen] (2022). From metamorphic core complex to crustal scale rollover: Post-Caledonian tectonic development of the Utsira High, North Sea. Tectonophysics. ISSN 0040-1951. 836. doi: 10.1016/j.tecto.2022.229416. Fulltekst i vitenarkiv
• Maher, Harmon; Braathen, Alvar; Ganerød, Morgan; Osmundsen, Per Terje; Redfield, Tim & Myhre, Per Inge [Vis alle 8 forfattere av denne artikkelen] (2022). Core complex fault rocks of the Silurian to Devonian Keisarhjelmen detachment in NW Spitsbergen. I Kuiper, Yvette D. (Red.), New Developments in the Appalachian-Caledonian-Variscan Orogen. The Geological Society of America. ISSN 9780813725543. s. 265–286. doi: 10.1130/2022.2554(11. Fulltekst i vitenarkiv Vis sammendrag

  A Silurian-Devonian metamorphic core complex has recently been recognized in northwest Spitsbergen, on the northwest corner of the Barents Shelf at the junction between the Atlantic and Arctic oceans. The associated Keisarhjelmen detachment, a major, ductile-brittle fault zone, is 200-500 m thick and has a map trace >150 km. A top-to-the-north transport direction is parallel to the axis of a large-scale, shallowly north-plunging, detachment corrugation. This detachment zone separates overlying faulted Silurian-Devonian aged cover strata from underlying migmatitic rocks in the core. The detachment shows a diverse array of fault and metamorphic rocks with structural ascent, ranging from sheared migmatite, mylonite, ultramylonite, foliated cataclasite, pseudotachylite, and breccia. Footwall post-kinematic granitic intrusions occurred shortly prior to, and likely during, deposition of the older cover strata. Variably deformed, syn-kinematic granitic sheets and veins within the detachment zone are considered coeval. Thin sections show significant grain size reduction, porphyroclasts, and well-developed composite fault surfaces. Relict garnet sigma porphyroclasts associated with chlorite and sericite indicate retrogression. Feldspar porphyroclasts show significant sericite alteration, undulose extinction and limited recrystallization low in the detachment, and brittle deformation throughout. Quartz deformation textures and grain size vary considerably within and between samples. Deformation during retrogression continued into the brittle realm with the development of thick foliated cataclasites, fault breccias, and local pseudotachylites concentrated at the top of the detachment. Biotite in particular shows grain size reduction, concentration along C-surfaces, and shredding and redistribution, suggesting it played a significant role in both ductile and brittle faulting. Veins, micro-veins, and fluid inclusion planes are ubiquitous throughout the detachment, indicating substantial fault-related fluid flow. Given existing geochronologic and P-T (pressure-temperature) data from the basement rocks of the area, the kinematics, retrogression, and ductile-brittle transition are consistent with exhumation of a core complex developing by orogen-parallel extension associated with transtension during the Late Silurian and Early to Middle Devonian in northwest Spitsbergen. Remaining questions include how this core complex connects with coeval plate-scale strike-slip faults in Svalbard, and its relationship to mainland Norwegian core complexes and Devonian basins to the south.

• Riber, Lars; Pera, Emilia Le; Morrone, Consuele; Ietto, Fabio; Conforti, Massimo & Dypvik, Henning (2022). Pore system evolution in arenaceous regoliths - Case study from the Sila Massif (southern Italy). Marine and Petroleum Geology. ISSN 0264-8172. 143. doi: 10.1016/j.marpetgeo.2022.105781. Fulltekst i vitenarkiv Vis sammendrag

  Porous and permeable crystalline rocks have the potential of being hydrocarbon reservoirs. In many cases, reservoir properties are created by rock-altering physico-chemical processes occurring in the near-surface environment. Hydrocarbon reservoirs in altered granitoids may comprise both arenaceous (clay-poor) and argillaceous (clay-rich) palaeoregoliths, and hence outcrop analogues from various environments are required. In the Sila Massif, southern Italy, the arenaceous weathering of medium to coarse grained granodioritic rocks has been studied. The pore system, dominated by microfractures, was described and quantified at each stage in the weathering process (altered coherent rock facies → saprock facies→ lower and upper saprolite facies → soil) in relation to changes in chemical and physical properties. The transformation of rock to saprolite was close to an isochemical process, as demonstrated by the low variations in the bulk mass transfer coefficient (τbulk). At the same time, trans-, intra- and intermineral microfractures increased in frequency and aperture upwards through the regolith profile. It was the main reason for the reduction of bulk densities (ρb) from 2.66 g/cm3 in the altered coherent rock to 1.88 g/cm3 in the saprolite, corresponding to the formation of up to 30% porosity (φc). The results suggest that a volume increase of >50%, represented by the volumetric strain factor (ε), was the main cause for the transformation of solid crystalline rock to porous saprolite. Anisovolumetric arenaceous regoliths with minimal mass loss, are the result of one of the major weathering processes, notwithstanding that they are much less understood than isovolumetric, anisochemical, argillaceous regoliths. Arenaceous saprolites potentially can have excellent porosity and permeability properties, with open and well-connected microfractures. Reservoir quality of arenaceous saprolites is in stark contrast to the poor permeability observed in some argillaceous saprolites where porosity is dominated by isolated dissolution voids within a clay-rich matrix.

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• Riber, Lars (2023). Frøya High basement characteristics. Fulltekst i vitenarkiv
• Braathen, Alvar (2023). Impact of fault-elastic rebound for sediment characteristics in hanging wall basins: observations and cases. Fulltekst i vitenarkiv
• Riber, Lars (2023). Analyses of basement-top weathering. Fulltekst i vitenarkiv
• Blinkenberg, Kasper & Braathen, Alvar (2023). Zechstein carbonates of the Utsira High region. Fulltekst i vitenarkiv
• Midtkandal, Ivar (2023). Changes in basin fill instigated by tectonic scenarios. Fulltekst i vitenarkiv
• Osmundsen, P.T. & Braathen, Alvar (2023). From rift-fault to mega-fault: fault throw and rollback impacting basin geometries. Fulltekst i vitenarkiv
• Osmundsen, P.T. & Braathen, Alvar (2023). Setting of the Frøya High and its northwards continuation to the Norland Ridge. Fulltekst i vitenarkiv
• Peron-Pinvidic, Gwen & Braathen, Alvar (2023). Evolution of the mid-Norwegian margin – from rift to breakup. Fulltekst i vitenarkiv
• Parcher, J. & Braathen, Alvar (2023). Basement-top plays and Jurassic deposits off the Utsira High (Johan Sverdrup Field). Fulltekst i vitenarkiv
• Braathen, Alvar (2023). Plans for a Suprabasins-II proposal (to Petromaks2: 15/2 or 15/9-23?). Fulltekst i vitenarkiv
• Sørlie, Ronald & Torp, Anders (2023). Basement reservoirs on the Norwegian Shelf. Processes of formation, challenges, and the way forward. Fulltekst i vitenarkiv
• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron, Gwenn (2023). Frøya High Learnings. Fulltekst i vitenarkiv
• Braathen, Alvar (2023). Isostatic rollback of faults and perched basins – some observations. Fulltekst i vitenarkiv
• Braathen, Alvar & Midtkandal, Ivar (2023). Plans for a Suprabasins-II proposal. Fulltekst i vitenarkiv
• Braathen, Alvar (2023). Plans for a Suprabasins-II proposal. Fulltekst i vitenarkiv
• Braathen, Alvar (2023). Introduction to Suprabasins. Fulltekst i vitenarkiv
• Braathen, Alvar (2023). Introduction to Utsira High proper. Fulltekst i vitenarkiv
• Braathen, Alvar (2023). Status on Suprabasins. Fulltekst i vitenarkiv
• Torp, Anders & Riber, Lars (2023). Basement reservoirs on the Utsira High - Weathering of the Utsira High during the Mesozoic resulted in unconventional reservoirs. Fulltekst i vitenarkiv
• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron-Pinvidic, Gwenn (2023). From detachment fault to turtleback structural configuration: insights from the Klakk Fault Complex and the Frøya High on the mid-Norwegian margin. Fulltekst i vitenarkiv
• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron-Pinvidic, Gwenn (2023). Sequential erosion of footwall culminations in necking domains during rifting: observations from and possible implications for Middle Jurassic – Early Cretaceous sedimentary distribution on and adjacent the Frøya High, mid-Norwegian margin. Fulltekst i vitenarkiv
• Midtkandal, I; Braathen, Alvar & Osmundsen, Per Terje (2022). Rift footwall range geomorphology as a function of fault length and throw. Fulltekst i vitenarkiv
• Smyrak-Sikora, Aleksandra; Augland, Amund; Betlem, Peter & Braathen, Alvar (2022). Deep-time paleoclimate events preserved in Svalbard’s rock record – a review. 35th IAS Meeting of Sedimentology. Fulltekst i vitenarkiv
• Vicedo, v; Robles-Salcedo, R; Poyatos-Moré, Miquel; Braathen, Alvar & Midtkandal, Ivar (2022). Evolution of a Paleogene shallow-marine platform in the northern sector of the Ibra Basin (NE Oman). Fulltekst i vitenarkiv
• Hassan, Muhammad & Braathen, Alvar (2022). Tectonic evolution of the Utsira High region. Fulltekst i vitenarkiv
• Blinkenberg, Kasper Høj; Braathen, Alvar; Stemmerik, Lars; Gianotten, Ingrid Piene & Polonio, Israel (2022). Permian carbonates of the Utsira High - new learnings. Fulltekst i vitenarkiv
• Riber, Lars (2022). Atmosphere - biosphere changes through time: Evidence from weathering and paleosol formation. Fulltekst i vitenarkiv Vis sammendrag

  The Earth's regolith (soils and weathered rocks) is highly sensitive to the interactions of a changing atmospheric composition and the terrestrial biosphere. By studying ancient regoliths (paleo-regoliths) we can follow the evolution of terrestrial life, from the earliest bacterial lifeforms (~3.48 Gya), through the oxygenation of our atmosphere by cyanobacteria (~2.4 Gya), the shift from mostly single-cellular organisms and simple ecosystem to complex animals and advanced plant life during the Cambrian explosion (~540 Mya), and the afforestation of the continents from Middle Devonian (~390 Mya). Paleo-regoliths have also recorded some of the most devastating events that have affected life through Earth's history, such as the Permian-Triassic (~250 Mya) and the Cretaceous – Paleogene extinctions (~66 Mya). Severe climatic shifts can result in abrupt changes in chemical rock weathering patterns, as is seen during the last great global warming episode during the Paleocene-Eocene Thermal maximum (55.9 Mya)

• Puig, Jose Maria; Braathen, Alvar & Howel, John (2022). Shallow marine sedimentary architecture of Jurassic growth-basin proximal to exhumed basement – the Johan Sverdrup case. Fulltekst i vitenarkiv
• Gresseth, Julie Linnea; Riber, Lars & Redfield, Tim F. (2022). Investigating a possible onshore-offshore correlation of the The Frøya High and the Frøya Island using an integrated approach. Fulltekst i vitenarkiv
• Tangari, Anna Chiara; Andò, Sergio; Marinangeli, Lucia; Riber, Lars & Pera, Emilia Le (2022). Provenance of Modern Sands from Baja California Rivers (Mexico). Fulltekst i vitenarkiv
• Würtzen, Camilla Louise; More, M.P; Midtkandal, Ivar & Braathen, Alvar (2022). The impact of faulting in depocentre development, facies assemblages, drainage patterns, and provenance in continental half‐graben basins: an example from the Fanja Basin of Oman. Basin Research. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; polonio, israel & Braathen, Alvar (2022). Follow-up meeting. Fulltekst i vitenarkiv
• Smyrak-Sikora, Aleksandra; Blinkenberg, Kasper; Braathen, Alvar & Dahlin, Anders (2022). Carboniferous–Permian rift systems in Svalbard. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; polonio, israel & Braathen, Alvar (2022). Zechstein collaboration work. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; Hodgkins, Malcolm & Braathen, Alvar (2022). U/Pb geochronology status meeting. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; polonio, israel; Rameil, Niels & Braathen, Alvar (2022). Lundin carbonates. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; polonio, israel & Braathen, Alvar (2022). Zechstein meeting. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; Rameil, Niels & Braathen, Alvar (2022). Core workshop and core viewing of Zechstein material. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; polonio, israel & Stemmerik, Lars (2022). Preservation and diagenesis of Zechstein platform carbonates, Utsira High, northern Norwegian North Sea – response to polyphase tectonic uplift. AAPG Europe GIC Workshop: Carbonate Reservoirs and Sequences:. Fulltekst i vitenarkiv
• Blinkenberg, Kasper & Braathen, Alvar (2022). Carbonate systems conference, Naples. Presented Zechstein study. LS + KHB + AD participated from Suprabasins. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; Hodgskiss, Malcolm S. W. & Braathen, Alvar (2022). U/Pb dating of Zechstein carbonates. Fulltekst i vitenarkiv
• Blinkenberg, Kasper; polonio, israel & Braathen, Alvar (2022). Zechstein meeting. Fulltekst i vitenarkiv
• Riber, Lars (2022). Basement reservoirs on the Utsira High, recent observations. Fulltekst i vitenarkiv
• Braathen, Alvar (2022). Tectonic setting of basins in Oman, and their relevance to North Sea studies. Fulltekst i vitenarkiv
• Braathen, Alvar; Midtkandal, Ivar & Osmundsen, Per Terje (2022). Geomorphology of continental rift landscapes - analyses inspired by North Sea observations. Fulltekst i vitenarkiv
• Braathen, Alvar (2022). Suprabasins Introduction; rift morphology. Fulltekst i vitenarkiv
• Braathen, Alvar & Midtkandal, Ivar (2022). Suprabasins – where do we go? Fulltekst i vitenarkiv
• Würtzen, Camilla Louise; Midtkandal, Ivar; Mulrooney, Mark Joseph & Braathen, Alvar (2022). Fault-influence in alluvial deposits of the Qahlah Formation - provenance, depocenter development, drainage patterns, and facies assemblage of Upper Cretaceous Fanja Basin, northeastern Oman. Fulltekst i vitenarkiv
• Gresseth, Julie & Braathen, Alvar (2022). Deep structures of the Bjarmland Platform region - Devonian tectonics guiding subsequent faulting in the Barents Shelf. Fulltekst i vitenarkiv
• Midtkandal, Ivar (2022). Depositional signatures of tectonic keel basin – Ibra Basin. Fulltekst i vitenarkiv
• Julian, Janocha & Braathen, Alvar (2022). Upper Devonian to Permian source rock potential on Bjørnøya and implications for the Barents Shelf. Fulltekst i vitenarkiv
• Dahlin, Anders & Braathen, Alvar (2022). Sørkapp-Hornsund High (South Spitsbergen) as an analogue to the Loppa High. Fulltekst i vitenarkiv
• Osmundsen, Per Terje & Braathen, Alvar (2022). Evolution of border faults in rifts and at rifted margins: tectono-sedimentary relationships produced by large-magnitude faulting and successive incision. Fulltekst i vitenarkiv
• Peron-Pinvidic, Gwen & Braathen, Alvar (2022). Prolonged evolution from rift to passive margin – the Mid-Norwegian Shelf. Fulltekst i vitenarkiv
• Smyrak-Sikora, Aleksandra & Braathen, Alvar (2022). Carboniferous to Permian rift deposits in Svalbard. Fulltekst i vitenarkiv
• Braathen, Alvar (2022). Suprabasins - Welcome and Introduction. Fulltekst i vitenarkiv
• Braathen, Alvar (2022). Suprabasins – status on project. Fulltekst i vitenarkiv
• Braathen, Alvar & Midtkandal, Ivar (2022). Suprabasins – where do we go? Fulltekst i vitenarkiv
• Blinkenberg, Kasper; Stemmerik,, Lars & Braathen, Alvar (2022). Permian carbonates of the Utsira High – new learnings. Fulltekst i vitenarkiv
• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron, Gwenn (2022). Tectonic development of the Frøya High, mid-Norwegian Margin. Fulltekst i vitenarkiv
• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron, Gwenn (2022). Frøya High, mid-Norwegian margin: Tectonic models and unconformities in the Late Jurassic. Fulltekst i vitenarkiv
• Poyatos-Moré, Miquel; Vicedo, v & Braathen, Alvar (2022). Depositional signatures and Tethys biostratigraphy of Paleogene tectonic keel basin – Ibra Basin, Oman. Fulltekst i vitenarkiv
• Stemmerik, Lars; Olaussen, Snorre & Braathen, Alvar (2022). Late Permian-Early Triassic synrift basin fill: Breakup of Pangea and the first brick in the puzzle of NE Atlantic-Arctic Mesozoic-early Cenozoic continental extension. Fulltekst i vitenarkiv
• Midtkandal, Ivar (2022). Clinothemes next to a fault-tip monocline in the Ibra Basin, Oman. Fulltekst i vitenarkiv
• Serck, Christopher Sæbø (2022). Tectonic evolution of the Utsira High region. Fulltekst i vitenarkiv
• Hassan, Muhammad & Faleide, Jan Inge (2022). Crustal structure and evolution in the northern North Sea - constraints for structural restorations in Suprabasins. Fulltekst i vitenarkiv
• Würtzen, Camilla Louise & Braathen, Alvar (2022). Fault-influence on the alluvial Upper Cretaceous Fanja Basin of northeastern Oman. Fulltekst i vitenarkiv
• Stemmerik, Lars & Braathen, Alvar (2022). Permian karstification in the northern North Atlantic and central Arctic. Fulltekst i vitenarkiv
• Redfield, Tim F.; Osmundsen, Per Terje & Braathen, Alvar (2022). A possible neotectonic signal derived from rivers of the MTFC - can a similar method be applied to offshore top basement grids? Fulltekst i vitenarkiv
• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron-Pinvidic, Gwenn (2022). Evolution of detachment fault systems within necking domains: insights from the Frøya and Gossa Highs, mid-Norwegian margin. Fulltekst i vitenarkiv
• Gresseth, Julie Linnea Sehested; Osmundsen, Per Terje & Peron-Pinvidic, Gwenn (2022). 3D evolution of necking domains: insights from the Frøya High, mid-Norwegian rifted margin. Fulltekst i vitenarkiv
• Braathen, Alvar & Eliassen, Gard (2023). Sele Ridge tectonics. Universitetet i Oslo. Fulltekst i vitenarkiv
• Braathen, Alvar & Johansen, Sindre Ekrene (2022). Tectono-sedimentary evolution of NW parts of the Devonian Hornelen Basin, West Norway. Universitetet i Oslo. Fulltekst i vitenarkiv
• Jarl, Espelund & Braathen, Alvar (2022). Extensional fault growth in high-resolution seismic data. Universitetet i Oslo. Fulltekst i vitenarkiv
• Bondevik, Lars H. & Braathen, Alvar (2022). Extensional fault growth in high-resolution seismic data. Universitetet i Oslo. Fulltekst i vitenarkiv

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