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  • Crustal processes sustain Arctic abiotic gas hydrate and fluid flow systems 

    Waghorn, Kate Alyse; Vadakkepuliyambatta, Sunil; Plaza-Faverola, Andreia; Johnson, Joel E; Bünz, Stefan; Waage, Malin (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-30)
    The Svyatogor Ridge and surroundings, located on the sediment-covered western flank of the Northern Knipovich Ridge, host extensive gas hydrate and related fluid flow systems. The fluid flow system here manifests in the upper sedimentary sequence as gas hydrates and free gas, indicated by bottom simulating reflections (BSRs) and amplitude anomalies. Using 2D seismic lines and bathymetric data, we ...
  • Anthropocene rockfalls travel farther than prehistoric predecessors 

    Vick, Louise Mary; Borella, Josh Walter; Quigley, Mark (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-02)
    Human modification of natural landscapes has influenced surface processes in many settings on Earth. Quantitative data comparing the distribution and behavior of geologic phenomena before and after human arrival are sparse but urgently required to evaluate possible anthropogenic influences on geologic hazards. We conduct field and imagery-based mapping, statistical analysis, and numerical modeling ...
  • Superimposed macro- and mesoscale folds, and their relation to ductile shear zones in the Karasjok Greenstone Belt, Finnmark, Norway 

    Stokmo, Eirik Bache (Master thesis; Mastergradsoppgave, 2020-06-05)
    The Karasjok Greenstone Belt (KGB) is a N-S trending supracrustal belt in Northern Norway. The KGB may comprise economically important mineral resources. Thus, a better understanding of ore genesis and structural architecture is key information for future exploration. The purpose of this master thesis is to perform detailed structural analysis based on field work in the northern part of KGB. Field ...
  • Long-lasting Cadomian magmatic activity along an active northern Gondwana margin: U–Pb zircon and Sr–Nd isotopic evidence from the Brunovistulian Domain, eastern Bohemian Massif 

    Soejono, Igor; Janousek, Vojtěch; Žáčková, Eliška; Sláma, Jiří; Konopásek, Jiří; Machek, Matěj; Hanžl, Pavel (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-03)
    Cadomian magmatic complexes of the Brunovistulian Domain crop out at the eastern termination of the Bohemian Massif. However, the age, nature and geotectonic affinity of some of pre-Variscan (meta-)igneous rock complexes from this domain are still unknown. Geochronological and geochemical study of the granitic rocks across the Brunovistulian Domain reveals new information about the timing and nature ...
  • Identifying global vs. basinal controls on Paleoproterozoic organic carbon and sulfur isotope records 

    Paiste, Kärt; Lepland, Aivo; Zerkle, Aubrey L.; Kirsimae, Kalle; Kreitsmann, Timmu; Mänd, Kaarel; Romashkin, Alexander E.; Rychanchik, Dimitry V.; Prave, Anthony R (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-03)
    Paleoproterozoic sedimentary successions are important archives of the redox evolution of Earth’s atmosphere and oceans. Efforts to unravel the dynamics of our planet’s early oxygenation from this archive rely on various geochemical proxies, including stable carbon and sulfur isotopes. However, ancient metasedimentary rocks often experienced early- and late-stage (bio)geochemical processes making ...
  • The rock slope failures at Låvan and Dusnjarga, Northern Norway. A comprehensive Quaternary, morphological and structural analysis 

    Blau, Frederic (Master thesis; Mastergradsoppgave, 2020-05-15)
    Rock avalanches and subsequent displacement waves represented the deadliest natural disaster in Norway in the past century. The two deep-seated and unstable slopes Dusnjarga and Låvan in Troms county (Norway) are clearly defined by morphological deformation features. Due to the steep fjord setting, a potential catastrophic rock avalanche could pose a severe threat to people and infrastructure along ...
  • Modification of bedrock surfaces by glacial abrasion and quarrying: Evidence from North Wales 

    Glasser, Neil F.; Roman, Matej; Holt, Tom O.; Žebre, Manja; Patton, Henry; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-30)
    Abrasion and quarrying are significant processes of subglacial erosion for ice masses in direct contact with hard substrates, yet their relative efficacy and spatio-temporal variability is unclear. Here, we investigate the glacial impact of these processes on a 70 m by 60 m bedrock surface at Moel Ysgyfarnogod in the Rhinog Mountains, Wales, using a combination of high-resolution digital photographs, ...
  • Upper Triassic to lower Cretaceous tectonostratigraphic development of the Barents Sea South East 

    Kristiansen, Ådne Frostad (Master thesis; Mastergradsoppgave, 2020-05-27)
    The aim of this study is to investigate the tectonic- and evolutionary differences between major structural elements of the Barents Sea South East (BSSE) during the uppermost Triassic to lower Cretaceous. The study area comprises the following structural elements: the Bjarmeland- and Finnmark platforms, the Nordkapp- and Tiddlybanken basins, the Signalhorn-, Haapet- and Veslekari domes and the ...
  • Tempestite facies variability and storm‐depositional processes across a wide ramp: Towards a polygenetic model for hummocky cross‐stratification 

    Jelby, Mads Engholm; Grundvåg, Sten-Andreas; Helland-Hansen, William; Olaussen, Snorre; Stemmerik, Lars (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-03)
    The hydrodynamic mechanisms responsible for the genesis and facies variability of shallow‐marine sandstone storm deposits (tempestites) have been intensely debated, with particular focus on hummocky cross‐stratification. Despite being ubiquitously utilized as diagnostic elements of high‐energy storm events, the full formative process spectrum of tempestites and hummocky cross‐stratification is still ...
  • Glacial dynamics and fluid flow processes in Bjørnøyrenna and the Loppa High area, SW Barents Sea 

    Ødegård Garpestad, Tor Geir (Master thesis; Mastergradsoppgave, 2020-05-15)
    During the Late Weichselian glaciation, the Bjørnøyrenna ice stream was the main outlet of the Barents Sea Ice Sheet. In this thesis, a 3D seismic dataset from the Loppa High, located in the main ice stream trunk, has been used to study the glacial sediment package, revealing details on pastglacial dynamics, fluid flow processes and gas hydrate formation. Three seismic horizons have been interpreted: ...
  • Engineering geology of the Jettan rockslide, Kåfjorden 

    Berg, Jørgen Nicolai (Master thesis; Mastergradsoppgave, 2020-05-15)
    The unstable rock slope (URS) Jettan is located at Nordnesfjellet in Kåfjorden municipality in Troms and Finnmark County, 800 m above the fjord. The rockslide has an estimated volume of 6 Mm3, and moving at a rate of up to 50 mm a-1. Jettan is considered a “high risk object” within the Norwegian unstable mountain framework. This is due to the potential displacement wave impact to housings, infrastructure ...
  • Innovative methods to monitor rock and mountain slope deformation 

    Hormes, Anne; Adams, Marc; Amabile, Anna Sara; Blauensteiner, Franz; Demmler, Christian; Fey, Christine; Ostermann, Marc; Rechberger, Christina; Sausgruber, Thomas; Vecchiotti, Filippo; Vick, Louise Mary; Zangerl, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-17)
    Displacement rates of mountain slope deformations that can affect entire valley mountain flanks are often measured spatially distributed in‐situ without spatial significance. The spatially explicit measurement and recording of time series of slope deformations is a challenge, as the unstable slopes are often disintegrated into several subdomains, which move with different deformation rates. The ...
  • Geochemical evidence for seabed fluid flow linked to the subsea permafrost outer border in the South Kara Sea 

    Semenov, Petr; Portnov, Aleksei D; Krylov, Alexey; Egorov, Alexander V; Vanshtein, Boris (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-16)
    Driven by rising bottom water temperatures, the thawing of subsea permafrost leads to an increase in fluid flow intensity in shallow marine sediments and results in the emission of methane into the water column. Limiting the release of permafrost-related gas hydrates and permafrost- sequestered methane into the global carbon cycle are of primary importance to the prevention of future Arctic Ocean ...
  • The relationship between shallow anomalies and gas-flaring on the flank of the Nordkapp Basin in the SE Barents Sea 

    Haldorsen, Joakim (Master thesis; Mastergradsoppgave, 2020-05-18)
    This study investigates the north-east-subbasin of the Nordkapp Basin in the Barents Sea. Main focus has been on mapping shallow seismic anomalies from 3D data, their potential association with faulting and sub-surface structures, and further to compare the occurrence of seismic anomalies to possible gas-flares above the seabed from water column data. The stratigraphic intervals from Triassic to ...
  • Last Glacial Maximum – Holocene palaeoenvironment in Bessel Fjord and southwestern Dove Bugt, Northeast Greenland 

    Zoller, Kevin Michael (Master thesis; Mastergradsoppgave, 2020-05-14)
    Marine studies reconstructing ice sheet conditions on the Northeast Greenland shelf and adjacent fjords since the Last Glacial Maximum (LGM) are sparse. As a result, the timing and origin of the deglaciation of the ice sheet over marine areas is not well constrained. This thesis aims to improve our understanding of the LGM, deglaciation, and Holocene ice dynamics of the Greenland Ice Sheet (GrIS) ...
  • Late Quaternary glacier and sea-ice history of northern Wijdefjorden, Svalbard 

    Allaart, Lis; Müller, Juliane; Schomacker, Anders; Rydningen, Tom Arne; Håkansson, Lena; Kjellman, Sofia Elisabeth; Mollenhauer, Gesine; Forwick, Matthias (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-10)
    The deglaciation history and Holocene environmental evolution of northern Wijdefjorden, Svalbard, are reconstructed using sediment cores and acoustic data (multibeam swath bathymetry and sub‐bottom profiler data). Results reveal that the fjord mouth was deglaciated prior to 14.5±0.3 cal. ka BP and deglaciation occurred stepwise. Biomarker analyses show rapid variations in water temperature and sea ...
  • Global temperature calibration of the Long chain Diol Index in marine surface sediments 

    de Bar, Marijke W.; Weiss, Gabriella; Yildiz, Caglar; Rampen, Sebastiaan W.; Lattaud, Julie; Bale, Nicole J.; Mienis, Furu; Brummer, Geert-Jan A.; Schulz, Hartmut; Rush, Darci; Kim, Jung-Hyun; Donner, Barbara; Knies, Jochen; Lückge, Andreas; Stuut, Jan-Berend W.; Sinninghe Damsté, Jaap S.; Schouten, Stefan (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-07)
    The Long chain Diol Index (LDI) is a relatively new organic geochemical proxy for sea surface temperature (SST), based on the abundance of the C<sub>30</sub> 1,15-diol relative to the summed abundance of the C<sub>28</sub> 1,13-, C<sub>30</sub> 1,13- and C<sub>30</sub> 1,15-diols. Here we substantially extend and re-evaluate the initial core top calibration by combining the original dataset with 172 ...
  • Analyse av strukturer og bevegelsesdata i det ustabile fjellskredområdet Gámmanjunni 3, Kåfjord kommune, Troms og Finnmark fylke. Med vekt på kontrollerende faktorer, skråningsprosesser, bevegelsesdynamikk og skredmodeller. 

    Hansen, Anne-Marte (Master thesis; Mastergradsoppgave, 2020-05-15)
    Gámanjunni 3 er et av de ustabile fjellpartiene i Norge med høyest bevegelseshastighet. Hovedmålet med studiet er å sammenstille gamle og nye feltdata, bevegelsesdata og geofysiske data fra tidligere studier ved Gámanjunni 3 til en helhetlig geologisk modell i 3D, og undersøke hvilke interne og eksterne faktorer som kontrollerer fjellpartiet. I tillegg skal det fokuseres på bevegelsesdynamikk, ...
  • Stratigraphy, neo-tectonics and mass wasting of deep water drifts in the Fram Strait 

    Selsaas, Bjarte (Master thesis; Mastergradsoppgave, 2020-05-15)
    The primary goal for this thesis was the reprocessing and interpretation of 2D seismic lines in the Fram Strait and West Svalbard Margin (WSM). Seismic data quality was significantly improved through the implementation of new processing steps that had previously not been applied, incl. e.g. burst removal and a more advanced type of migration. The reprocessed lines were acquired by CAGE over multiple ...
  • Late Devonian–Carboniferous faulting and controlling structures and fabrics in NW Finnmark 

    Koehl, Jean-Baptiste P.; Bergh, Steffen G; Osmundsen, Per Terje; Redfield, Thomas Fitzmaurice; Indrevær, Kjetil; Lea, Halldis; Bergø, Espen (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-10)
    In the SW Barents Sea, Devonian–Carboniferous collapse led to the formation of major basins and faults, e.g., the Hammerfest Basin bounded by the Troms–Finnmark Fault Complex, and rhomboid- to sigma-shaped (half-)grabens on the Finnmark Platform. High-resolution aeromagnetic and bathymetry data from the shallow shelf show that analogue fault systems are present in coastal and onshore areas of NW ...

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