Søk
Viser treff 1-10 av 690
Reconstructions of paleoceanography and ice retreat based on benthic foraminifera, stable isotopes and sedimentological investigations from the northwestern Barents Sea south of Nordaustlandet, Svalbard
(Master thesis; Mastergradsoppgave, 2016-07-12)
One gracity core NP05–11–49GC was retrieved from a 320 m water depth in the central part of Erik Eriksen Strait, south of Nordaustlandet, northwestern Barents Sea. The core was investigated for benthic foraminiferal distribution patterns, stable isotopes and sedimentological parameters in order to reconstruct the Late Weichselian deglaciation and Holocene paleoenvironment and paleoceanography of the ...
Paleoceanographic development in Leirdjupet, during the last deglaciation
(Master thesis; Mastergradsoppgave, 2016-08-23)
The focus of this master thesis is to investigate the paleoenvironmental and paleoceanography
during the last deglaciation in Leirdjupet, a small submarine trough in the southwestern
Barents Sea. The lower half of the piston corer HH15-1303PC has been investigated for the
distribution pattern of benthic foraminifera faunas, ice rafted debris (IRD), lithology and
oxygen and carbon isotopes covering; ...
Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-28)
The SW Barents Sea margin experienced a pulse of extensional deformation in the Middle–Late Devonian through the Carboniferous, after the Caledonian Orogeny terminated. These events marked the initial stages of formation of major offshore basins such as the Hammerfest and Nordkapp basins. We mapped and analyzed three major fault complexes, (i) the Måsøy Fault Complex, (ii) the Rolvsøya fault, and ...
Semi-quantitative reconstruction of early to late Holocene spring and summer sea ice conditions in the northern Barents Sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-07)
Semi-quantitative estimates of early to late Holocene spring sea ice concentration (SpSIC) andoccurrence of summer sea ice for the northern Barents Sea have been obtained by analysing the biomarkers IP<sub>25</sub>,brassicasterol and a tri-unsaturated highly branched isoprenoid lipid in a Holocene marine sediment core.Sub-surface water mass variations were derived from planktic foraminiferal assemblages ...
Paleo-methane emissions recorded in foraminifera near the landward limit of the gas hydrate stability zone offshore western Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-26)
We present stable isotope and geochemical data from four sediment cores from west of Prins
Karls Forland (ca. 340 m water depth), offshore western Svalbard, recovered from close to sites of
active methane seepage, as well as from shallower water depths where methane seepage is not
presently observed. Our analyses provide insight into the record of methane seepage in an area
where ongoing ocean ...
Sources and turnover of organic carbon and methane in fjord and shelf sediments off Northern Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-10-22)
To better understand the present and past carbon cycling and transformation processes in
methane-influenced fjord and shelf areas of northern Norway, we compared two sediment cores from the Hola trough and from Ullsfjorden. We investigated (1) the organic matter composition and sedimentological characteristics to study the sources of organic carbon (C<sub>org</sub>) and the factors influencing ...
Petrographic investigation of methane-derived authigenic carbonate crusts from Barents Sea and Norwegian Sea
(Master thesis; Mastergradsoppgave, 2016-06-15)
Methane-derived authigenic carbonate crusts from four seepage sites at the Loppa High in the southwestern Barents Sea, and one seepage site at Hola, off Vesterålen in the Norwegian Sea, have been investigated, with the main focus of understanding if and how the tests of benthic and planktonic foraminifera occurring in the crusts could serve as nucleation centers for the precipitated carbonates.
Cenozoic Erosion of the Barents Sea Shelf, Norwegian Arctic: A Review
(Conference object; Konferansebidrag, 2018-12)
The circum North Atlantic-Arctic continental margin and adjacent land areas have experienced
several episodes of uplift and erosion during the Cenozoic. A series of efforts quantifying this
erosion for the Barents Sea shelf, where the Arctic shelf is at its widest and deepest have been
done since the early 90’s using different methods. As the seismic and well database have
expanded considerably, ...
Fault-controlled asymmetric landscapes and low-relief surfaces on Vestvågøya, Lofoten, North Norway: inherited Mesozoic rift-margin structures?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-20)
The Lofoten Ridge is an integral basement horst of the hyperextended continental rift-margin off northern Norway. It is a key area for studying onshore–offshore rift-related faults, and for evaluating tectonic control on landscape development along the North Atlantic margin. This paper combines onshore geomorphological relief/aspect data and fault/fracture analysis with offshore bathymetric and ...
Paleoceanographic development in Storfjorden, Svalbard, during the deglaciation and Holocene: evidence from benthic foraminiferal records
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-08-07)
Brines can have a profound influence on the relative abundance of calcareous and agglutinated foraminiferal faunas. Here we investigated the distribution of benthic foraminiferal species in four cores from a brine‐enriched environment in Storfjorden, Svalbard. Stratigraphically, the cores comprise the last 15 000 years. The purpose of the study was to reconstruct changes in the palaeoecology and ...