Institutt for geovitenskap: Recent submissions

Now showing items 701-720 of 1025

    • Triassic Channel Systems on the northern Loppa High, SW Barents Sea 

      Arntzen, Marit (Master thesis; Mastergradsoppgave, 2018-06-07)
      During the Triassic, the Barents Sea Basin was filled with sediments from the Uralian and Caledonian mountain belts. High sediment yield and large river systems made progradation possible, resulting in an alluvial to deltaic plain stretching from the mountain belts in the south east to Spitsbergen in the north.This thesis focuses on the northwestern part of the Loppa High area, SW Barents Sea. The ...

    • The regional upper Paleozoic development of the SE part of the Norwegian Barents Sea - from seismic interpretation 

      Slettehaug, Hanne-Lise (Master thesis; Mastergradsoppgave, 2018-05-15)
      This thesis focuses on the Barents Sea South East (BSSE), and the overall goal has been to investigate the regional upper Paleozoic development in the SE part of the Barents Sea. After more than four decades of negotiation between Norway and Russia, a delineation agreement came in effect in 2011. Today, the area known as BSSE is opened up for petroleum operations. As part of the opening of the BSSE, ...

    • Ore petrography and fluid evolution in the Cu-(Zn) VMS deposits at Sulitjelma, Northern Norway 

      Birkeland, Andre (Master thesis; Mastergradsoppgave, 2018-05-29)
      The Sulitjelma deposits, Nordland, Northern Norway, with more than 20 Zn-Cu ore bodies (total tonnage excesses 35 Mt of ore at 1.84 % Cu, 0.86 % Zn, 10 g/t Ag and 0.25 g/t Au) have been described as a classic example of the Zn-Cu volcanogenic massive sulfide (VMS) mineralization. The mineralization is spatially associated with metamorphosed mafic rocks of Ordovician age. Both, ore bodies and their ...

    • The origin of quartz-carbonate veins hosted by ductile shear zones of the Astridal Supracrustal Belt, West-Troms Basement Complex. 

      Forslund, Thea Mathilde (Master thesis; Mastergradsoppgave, 2018-05-29)
      An approximately 1 meter wide NE-SW-oriented mylonitic shear zone hosts hydrothermally precipitated quartz and carbonate veins. The shear zone mainly consists of a secondary mylonitic fabric enriched in chlorite. A similar mylonitic shear zone striking NE-SW, oriented parallel to the axial plane of a F3-fold, consists of the same secondary mylonitic chloritized fabric and are therefore assumingly ...

    • Comparison of 3D and 2D rockfall models. Considering terrain model quality effect on respective model performances 

      Hind, Håvard (Master thesis; Mastergradsoppgave, 2018-05-15)
      Rockfalls are blocks of rock that bounce and roll down slopes. They are commonly detached from rock-slopes with inclinations over 40-45°. They embody high energy and mobility and are a major cause of landslide related deaths. Rockfalls can be simulated using empirical relationships and modelling, of which 2D and 3D variants exist for the latter. 3D models allow for rock fragment- and surface shape ...

    • Regional structural analysis of rock slope failure types, mechanisms and controlling bedrock structures in Kåfjorden, Troms 

      Andresen, Maren Lund (Master thesis; Mastergradsoppgave, 2018-05-15)
      Unstable areas producing rock slope failures come with large consequences. The understanding of why and where they might occur is necessary to mitigate damage and prevent casualties. A total of 133 unstable rock slopes have been detected in Troms, Northern Norway, evidencing that a great focus on these geohazards is important. This study has focused on seven unstable rock slopes in Kåfjorden, Troms, ...

    • Steinsprang. Simulering, bevegelsesanalyse, struktur- og geomorfologisk undersøkelse av steinsprangområdet over Holmen ved Oksfjellet, Kåfjord, Troms. 

      Haukenes, Håvard Lytskjold (Master thesis; Mastergradsoppgave, 2018-05-14)
      Vurdering av skredfare og sikringstiltak i Kåfjord kommune i Troms viste i 2012 at en driftsbygning ved Holmen i Kåfjorddalen var utsatt for steinsprang fra Oksfjellet. Det er registrert flere steinsprang i tillegg til bevegelser i et mindre fjellparti under toppen av Oksfjellet. Studieområdet over Holmen har dermed et unikt potensiale for å studere flere problemstillinger tilknyttet steinsprang. ...

    • Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea 

      Piasecka, Emilia Daria; Winsborrow, Monica; Andreassen, Karin; Stokes, Chris R. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-01)
      The stability of contemporary ice sheets is influenced by the discharge from ice streams - corridors of fast-flowing ice bounded by ice flowing an order of magnitude slower. Reconstructions of palaeo-ice stream dynamics contribute to our understanding of ice stream sensitivity to the ocean-climate system and can aid in the numerical modelling and prediction of future changes in contemporary ice ...

    • Glacial isostatic adjustment associated with the Barents Sea ice sheet: A modelling inter-comparison 

      Auriac, Amandine; Whitehouse, P.L.; Bentley, M.J.; Patton, Henry; Lloyd, J.M.; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-01)
      The 3D geometrical evolution of the Barents Sea Ice Sheet (BSIS), particularly during its late-glacial retreat phase, remains largely ambiguous due to the paucity of direct marine- and terrestrial-based evidence constraining its horizontal and vertical extent and chronology. One way of validating the numerous BSIS reconstructions previously proposed is to collate and apply them under a wide range ...

    • Atmospheric circulation patterns associated with avalanche cycles in the Troms region 

      Jenssen, Marius (Master thesis; Mastergradsoppgave, 2018-05-15)
      Snow avalanches endangers human lives and infrastructure situated in alpine environments during the winter season. Occurrence of avalanche activity is a product of processes taking place in the snow cover situated in steep terrain, which are governed by meteorological conditions induced by synoptic weather patterns. Avalanche forecasting can therefore better forecast avalanche activity if they ...

    • Deposits and processes on the tide-influenced fjord-head delta in Dicksonfjorden, Svalbard 

      Kvam, Maria Huse (Master thesis; Mastergradsoppgave, 2018-05-15)
      This study investigates for the first time the tide-influenced fjord-head delta in Dicksonfjorden, a fjord in central Spitsbergen, Svalbard. In order to examine the deposits and processes, sediment cores, surface observations and bulk samples have been obtained. Sedimentary facies, log transects and composite logs are presented. Sediment cores are dated with the 210Pb dating method to provide an ...

    • Sedimentation in Lake Nordlaguna - a closed basin on Jan Mayen 

      Christoffersen, Marianne (Master thesis; Mastergradsoppgave, 2018-05-15)
      This thesis focuses on the lake Nordlaguna on Jan Mayen. Nordlaguna is closed basin separated from the ocean by a barrier and surrounded by steep mountains and valleys. The lake has the potential to be a paleoclimatic archive and provide information about the unknown sea-level history of the island. When lake sediments are used in paleoclimatic studies, it is useful to acquire knowledge about the ...

    • The Late Paleozoic development of the Ottar basin from seismic 3D interpretation 

      Tonstad, Sigurd August (Master thesis; Mastergradsoppgave, 2018-05-15)
      The Late Paleozoic sedimentary environments of the Ottar basin in the SW Barents Sea was studied using five 3D seismic surveys. By the use of seismic stratigraphic analysis and correlation to wells located in close proximity to the study area, the Paleozoic succession has been subdivided into 4 main units: Billefjorden Group (Late Devonian – Mid Carboniferous), Gipsdalen Group (Mid Carboniferous – ...

    • The upper Paleozoic regional development of the Ottar basin from seismic 2D interpretation 

      Finnesand, Sebastian Sandvik (Master thesis; Mastergradsoppgave, 2018-05-15)
      The Ottar basin is not yet formally defined, but is a known structural element situated under the Bjarmeland Platform in the southwestern Barents Sea, buried beneath thick, flay-lying Mesozoic strata. This thesis focuses on delineating the informal upper Paleozoic Ottar basin. The delineation presented, is based on lateral/vertical variations in lithology and the surrounding tectonic setting of the ...

    • Reconstruction of the bottom current strength of overflow water through the Faeroe-Shetland Channel in relation to climate change during the last 135,000 years 

      Solheim, Martin (Master thesis; Mastergradsoppgave, 2018-05-15)
      The focus of this thesis was to reconstruct the bottom current strength around the Faeroe Islands and relate it to the climate variability over the past 35,000 - 135,000 years and the Holocene, using the piston core, JM11-FI-19PC, from the North-eastern shelf of the Faeroe Islands. The core location is ideal for measuring the overflow from the Nordic Seas, as it is strategically placed on top of the ...

    • Late Miocene Ice Rafting in the Iceland Sea. Evidence from coarse fraction analysis of ODP Site 907 

      Dischington, Rebekka (Master thesis; Mastergradsoppgave, 2018-05-15)
      A high-resolution sedimentary record from ODP Leg 151 Hole 907A has been investigated with sedimentological and geochemical methods to study the paleoenvironmental evolution of the Iceland Sea over a 1-Myr time interval in the Late Miocene. Climate deterioration characterizes the Neogene period, culminating in a transition to bipolar glaciations in the Late Pliocene (Thiede and Myhre, 1996). Ice ...

    • Complementary biomarker-based methods for characterising Arctic sea ice conditions: A case study comparison between multivariate analysis and the PIP25 index 

      Koseoglu, Denizcan; Belt, Simon T.; Smik, Lukas; Yao, Haoyi; Panieri, Giuliana; Knies, Jochen (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-10)
      The discovery of IP25 as a qualitative biomarker proxy for Arctic sea ice and subsequent introduction of the so-called PIP25 index for semi-quantitative descriptions of sea ice conditions has significantly advanced our understanding of long-term paleo Arctic sea ice conditions over the past decade. We investigated the potential for classification tree1 (CT) models to provide a further approach ...

    • Geometriske og kinematiske studier av post-kaledonske rift-margin forkastninger og bruddsett mellom Tjeldsundet og Bjarkøy, Sør-Troms. 

      Johnsen, Therese Mortensen (Master thesis; Mastergradsoppgave, 2018-05-15)
      Dette studiet har fokus på analyse og korrelasjon av post-kaledonske riftstrukturer i nordre Nordland og Sør-Troms, hvor målet er å sammenligne antatte paleozoiske og mesozoiske sprø forkastninger på land med lignende strukturer på havbunnen og i fjorder og sund. Ved bruk av høyoppløselige digitale verktøy fra land (kartverket, norgeibilder, norgei3d) og på havbunnen (mareano), tar denne masteroppgaven ...

    • A combined 3D seismic and sedimentological study of the Lower Cretaceous succession in the northeastern part of the Nordkapp Basin 

      Brennhaugen, Adam Alfred (Master thesis; Mastergradsoppgave, 2018-05-15)
      In this master’s thesis in geology, 3D seismic data and shallow stratigraphic cores were used to investigate the Lower Cretaceous succession in the central sub-basin of the Nordkapp Basin, Barents Shelf. The Lower Cretaceous is listed as a potential petroleum play model on the Barents Shelf, which makes the succession of interest for petroleum exploration. Recent studies of the have divided the ...

    • The role of diapiric mound structures in the overburden fluid plumbing systems of the Vøring Basin 

      Hansen, Lene Loug (Master thesis; Mastergradsoppgave, 2018-05-15)
      The overall aim of this thesis is to better understand the development and emplacement of diapiric mound features in the Vema Dome area, located in the Vøring basin on the mid-Norwegian continental margin. Two 3D seismic surveys, ST9603R99 and BPN9601, were interpreted in this study, in order to investigate the diapiric mounds and their relationship with an underlying fluid plumbing system including ...