Blar i tittel Mastergradsoppgaver i geologi
Viser treff 22-41 av 271
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Climate and sea-ice development between 890 and 1660 CE in SW Greenland revealed by marine diatom studies
(Master thesis; Mastergradsoppgave, 2022-11-24)This thesis presents the results of august Sea Surface Temperature reconstructions from marine diatom assemblages in samples from core Ga3-2 retrieved from Narsaq Sound, inside the Ikersuad fjord, South Greenland. The diatom samples provide a high-resolution (~30-year) reconstruction dating between 890 and 1660 CE (common era). The results show variable conditions with warm periods between 960 and ... -
Climate controlled sedimentary processes in the Riiser Larsen Sea offshore Queen Maud Land, Antarctica
(Master thesis; Mastergradsoppgave, 2018-11-29)Multi-proxy analysis of gravity core PS56/029-1 have been performed in order to describe sedimentary processes and dynamics under pelagic, turbiditic and contouritic influences. The purpose is to reconstruct climate-controlled environmental change in the Riiser Larsen Sea, Antarctica, through past glacial/interglacial cycles. The gravity core was retrieved during expedition ANTARKTIS XVII/2 of R/V ... -
Climate reconstruction during the Last Glacial Maximum based on a marine sediment core from Vestnesa Ridge, Svalbard
(Master thesis; Mastergradsoppgave, 2018-07-14)The sediment core HH15-1255PC has been analyzed to reconstruct the climate in the Fram Strait during the last 45,000 years. The coring site is located west of Svalbard on the Vestnesa Ridge, a contourite drift with a high-resolution sedimentary record (Plaza-Faverola et al., 2015). This ridge also includes a pockmark field formed by methane seepage (Vogt et al., 1994). The core HH15-1255PC is a ... -
A combined 3D seismic and sedimentological study of the Lower Cretaceous succession in the northeastern part of the Nordkapp Basin
(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 ... -
Combining geophysical data with a mathematical model to describe vertical two-phase flow
(Master thesis; Mastergradsoppgave, 2018-05-15)This thesis combines a geological model with a mathematical model to describe the vertical propagation of a gas plume through layers with different physical properties. The geological model is based on geophysical data from the Sørvestsnaget Basin and the mathematical model is derived based on the classical Buckley-Leverett theory for two-phase flow. The model estimates the velocity of a vertical ... -
A comparative seismic study of gas chimney structures from active and dormant seepage sites offshore mid-Norway and west-Svalbard
(Master thesis; Mastergradsoppgave, 2015-05-15)Understanding the fluid flow and the related fluid expulsion from gas chimneys and pipe structures is very important to our environment, since seeping methane has a great influence on our Earth’s climate. Chimneys are found in many places in the world, for instance at the Vestnesa ridge offshore western Svalbard and at the Nyegga region on the mid Norwegian margin. Plumbing systems and chimney ... -
Comparison and classification of an Arctic Transitional snow climate in Tromsø, Norway
(Master thesis; Mastergradsoppgave, 2017-10-11)Winter tourism in Tromsø has increased significantly over the last years, consequently also the skiing tourism. It is advertised that Tromsø has a mild coastal climate compared to other destinations at similar latitudes. Existing snow climate classes separate covers into a maritime, continental and a transitional class where persistent weak layers are rare in the maritime class. Rain and average air ... -
Comparison of 3D and 2D rockfall models. Considering terrain model quality effect on respective model performances
(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 ... -
Connecting the late Neoproterozoic flysch sedimentation in the Gariep Belt (Namibia) with its potential source region in southern Dom Feliciano Belt (Uruguay) – a U-Pb detrital and protolith zircon study.
(Master thesis; Mastergradsoppgave, 2020-06-22)The Dom Feliciano Belt in Uruguay represents a counterpart of the Gariep Belt in Namibia and these two belts are presently considered as relics of one orogen split by the Atlantic Ocean. In this study, two presumed flysch samples from the Marmora Terrane of the Gariep Belt in Namibia, and five samples from potential source areas in the Nico Perez Terrane of the Dom Feliciano Belt in Uruguay have ... -
Connection between chemical zonation and crystallographic preferred orientation as an indicator for the fabric development in eclogites. Example from the Saxothuringian eclogites, Bohemian massif, Czech Republic
(Master thesis; Mastergradsoppgave, 2017-05-15)The presence of eclogites is one of the strongest evidences for high pressure metamorphism, and for the presence of a paleo subduction zone. Deformation of eclogites can yield important information about the kinematics of subduction zones. The main mechanism for fabric development in eclogites is still a matter of debate among various research groups and has split the field in two. Most previous ... -
Controls on fluid-flow systems in the Loppa High, SW Barents Sea
(Master thesis; Mastergradsoppgave, 2018-05-14)The SW Barents Sea is a large hydrocarbon-prone epicontinental Sea comprised of a complex mosaic of deep sedimentary basins and structural highs. Uplift and erosion have been affecting the area on a large scale since the Cenozoic and have had a major impact on the petroleum systems in the area, resulting in spillage of hydrocarbons. The origin of the hydrocarbons are from deep source rocks, which ... -
Correlation between changes in paleoceanography, paleoclimate and methane seepage on Vestnesa Ridge, eastern Fram Strait.
(Master thesis; Mastergradsoppgave, 2015-12-21)Two sediment cores HH14-002 GC and HH12-930 GC from Vestnesa Ridge in the eastern part of Fram Strain have been investigated to reconstruct the paleoclimate and paleoceanographic conditions during the last ~37,000 years, and to study possibly changes in emission of methane from the seabed through time. Core HH14-002 GC was taken from outside a pockmark, while core HH12-930 GC was taken from inside ... -
Cross-disciplinary investigation of gas seepage at Storbanken high and the Olga basin, The northern Barents Sea
(Master thesis; Mastergradsoppgave, 2019-05-15)The eastern parts of the northern Barents Sea is a little explored sector of the Barents Sea which currently is not open for petroleum activity. This thesis focuses on the processes and mechanisms controlling gas seepage activity in the Olga basin and Storbanken high. 2D seismic and bathymetric data has been correlated with water column acoustic data to identify gas bubbles in the water column and ... -
Dannelse og utvikling av submarine kanjoner på kontinentalskråningen utenfor Lofoten
(Master thesis; Mastergradsoppgave, 2015-05-15)Tre kanjoner på kontinentalskråningen utenfor Lofoten er studert ut fra multistråle batymetridata, høyoppløselig seismiske data og foto av havbunnssedimenter. Formålet med denne studien er å diskutere dannelse, utviklingen av og den yngste aktiviteten i de tre kanjonene. To hovedhypoteser vedrørende kanjoners dannelse råder i dag; dannelse fra bunn av kontinentalskråningen og oppover eller fra ... -
Deglasiasjon og postglasial dalinnfyllingshistorie i Målselvdalen : en syntese basert på egne undersøkelser i øvre Målselvdalen og tidligere arbeid i midtre og nedre Målselvdalen
(Master thesis; Mastergradsoppgave, 2013-08-14)Dalinnfylling i Målselvdalen Øst er kartlagt og beskrevet på bakgrunn av feltarbeid, kvartærgeologisk kartlegging og littaraturstudier. Det er også basert på tidligere (av andre) undersøkelser i Målselvdalen. Målet har vært å beskrive deglasial og postglasial innfylling av Målselvdalen Øst. -
Deposits and processes on the tide-influenced fjord-head delta in Dicksonfjorden, Svalbard
(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 ... -
Development of the Late Paleozoic, Mesozoic and Cenozoic sedimentary succession in SW Barents Sea and their role in fluid leakage process
(Master thesis; Mastergradsoppgave, 2012-06-15)2D seismic and well data have been used to understand the geological evolution of the SW Barents Sea by interpreting different seismic units and to evaluate their role in distribution of fluid migration system. Eight seismic unit including seafloor are identified in the study area based on well tie with seismic data. Torsk and Kolmule formation show western progradational pattern suggesting deposition ... -
Distribution, deposition and impact of tailing disposal on the seafloor in Ranfjorden, northern Norway
(Master thesis; Mastergradsoppgave, 2018-07-29)This study is conducted in Ranfjorden in northern Norway with the goal of gaining a better understanding of the interaction between natural and anthropologic sediments within the fjord. Ranfjorden is of interest due to the fact that it has experienced extensive anthropologic impacts over the last 100 years with the submarine tailings placement (STP) of mine tailings ongoing. The analysis of this ... -
Drill cutting release in Ingøydjupet, SW Barents Sea from a well drilled in 1987, and its impact on benthic foraminifera
(Master thesis; Mastergradsoppgave, 2017-05-15)In the nearby areas of the SW Barents Sea, large hydrocarbon reserves have been identified. During drilling procedures, drill cuttings are produced and some are released to sea. The disposal of drill cuttings may cause environmental degradation to the marine environment. Increasing petroleum activities, therefore requires further knowledge of ocean current transportation of fine sediment particles ... -
Dynamically controlled hydrocarbon column heights in fault bounded traps of the Hammerfest Basin, SW Barents Sea. Fault valve theory applied to the Snøhvit field
(Master thesis; Mastergradsoppgave, 2019-11-18)During initial exploration efforts in the Barents Sea several gas prone and underfilled prospects were drilled which significantly dropped the interest in the area. The Hammerfest Basin however turned out to hold significant hydrocarbon volumes. Although still mostly underfilled, the discoveries here today make up the Snøhvit oil and gas field. The Hammerfest Basin is an overfilled petroleum basin, ...