Browsing Department of Earth Science by Title
Now showing items 81-100 of 858
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A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum
(Peer reviewed; Journal article, 2014-09-15)A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms ... -
A Comparative Palynofacies Study of Two Methods Used for Source Rock Validation. A Case Study From a Mississippian Succession on Spitsbergen
(Master thesis, 2017-06-30)This study is conducted on the analysis of twenty-nine kerogen slides of Tournasian and Visean age. The outcrop samples were collected from the Hoelbreen and Birger Johnsonfjellet Members in the Birger Johnsonfjellet section ... -
Comparison of metamorphic evolution and tectonic position of metasediments of the Austevoll islands with rocks from the Samnanger Complex (Major Bergen Arc, Norwegian Caledonides)
(Master thesis, 2015-08-01)Metasedimentary rocks represent a substantial component of the Bergen Arcs System and they are mostly confined to the Minor and Major Bergen Arcs. The arcs represents imbricate structures composed of island arc lithologies, ... -
A complex point-source solution of the acoustic eikonal equation for Gaussian beams in transversely isotropic media
(Peer reviewed; Journal article, 2020-03-11)The complex traveltime solutions of the complex eikonal equation are the basis of inhomogeneous plane-wave seismic imaging methods, such as Gaussian beam migration and tomography. We present the analytic approximations for ... -
Complex strain partitioning and heterogeneous extension rates during early rifting in the East Shetland Basin, northern North Sea
(Journal article; Peer reviewed, 2020)The early stages of continental rifting are accommodated by the growth of upper crustal normal fault systems that are distributed relatively evenly across the rift width. Numerous fault systems define fault arrays, the ... -
Compositions of dissolved organic matter in the ice-covered waters above the Aurora hydrothermal vent system, Gakkel Ridge, Arctic Ocean
(Journal article; Peer reviewed, 2022)Hydrothermal vents modify and displace subsurface dissolved organic matter (DOM) into the ocean. Once in the ocean, this DOM is transported together with elements, particles, dissolved gases and biomass along with the ... -
Computationally Efficient Methods for Seismic Modeling and Inversion
(Doctoral thesis, 2020-11-18)This thesis presents new methods for the modeling of seismic waveforms based on ray theory and ray-Born integrals. The waveforms are used in forward modeling, imaging and full waveform inversion and are computed in 3D ... -
Consistent fluctuations in intermediate water temperature off the coast of Greenland and Norway during Dansgaard-Oeschger events
(Peer reviewed; Journal article, 2019-11-01)Rapid warmings epitomize the Dansgaard-Oeschger events that are recorded in Greenland ice cores and imprinted in ocean sediment cores. While the abrupt climate changes appear connected to perturbations in sea ice and ocean ... -
Continuous and episodic sedimentation in western Norwegian fjord lakes. A Holocene climatic perspective
(Doctoral thesis, 2011-10-21)A Holocene chronology of hazardous events has been constructed in parallel with a new record of glacier variability from inner Nordfjord in western Norway, based on the analysis of seismic profiles and sediment cores from ... -
A continuous tephrostratigraphic record from the Labrador Sea spanning the last 65 ka
(Journal article; Peer reviewed, 2020)Volcanic ash preserved in marine sediment sequences is key for independent synchronization of palaeoclimate records within and across different climate archives. Here we present a continuous tephrostratigraphic record from ... -
Contractional deformation of porous sandstone: Insights from the Aztec Sandstone, SE Nevada, USA
(Peer reviewed; Journal article, 2015-05)Contractional deformation of highly porous sandstones is poorly explored, as compared to extensional deformation of such sedimentary rocks. In this work we explore the highly porous Aztec Sandstone in the footwall to the ... -
Contractional deformation of porous sandstones. Laramide and Sevier deformation of the Navajo and Aztec sandstones in western USA
(Doctoral thesis, 2015-02-16)In response to stress, high porosity sandstones tend to deform and localize strain in the form of deformation bands, which form by rotation, sliding and potentially crushing of grains. Contrary to slip surfaces and fractures, ... -
Control of increased sedimentation on orogenic fold-and-thrust belt structure-insights into the evolution of the Western Alps
(Peer reviewed; Journal article, 2019-03-13)We use two-dimensional thermomechanical models to investigate the potential role of rapid filling of foreland basins in the development of orogenic foreland fold-and-thrust belts. We focus on the extensively studied example ... -
Controls of basement fabric on cover faulting in strike-slip regimes: analogue physical models of faults using plaster
(Master thesis, 2015-06-01)The full complexity of deformation associated with natural faults is difficult to understand, given the lack of three-dimensional exposure in outcrop and the limitations of seismic resolution in the sub-surface. Analogue ... -
Controls on architecture and seismic imaging of igneous intrusions: Examples from LIDAR outcrop data on Traill Ø (East Greenland) and seismic data from the conjugate Møre Margin
(Master thesis, 2017-06-27)Intrusion of sills into sedimentary successions is a fundamental and widespread process in basins at volcanic rifted margins. Although intrusions emplaced at shallow paleodepths (<1.5 km) are relatively well understood, ... -
Controls on deformation band formation in carbonate grainstones along the Maghlaq Fault, Malta.
(Master thesis, 2018-06-20)Deformation bands are common structures in deformed porous rocks and sediments, that localise strain in millimetre to centimetre thick tabular zones. Deformation bands occurring in siliciclastic rocks have been described ... -
Controls on hydrocarbon column-heights in the Eastern province of Haltenbanken, the Norwegian Sea
(Master thesis, 2016-11-08)Knowledge of controls on hydrocarbon column-heights is highly relevant in hydrocarbon exploration, and important for determination of in-place volumes of prospects. The eastern province of Haltenbanken in the Norwegian Sea ... -
Controls on hydrocarbon column-heights in the north-eastern North Sea
(Master thesis, 2015-06-30)Knowledge about the controls on hydrocarbon column-heights is important in hydrocarbon exploration, as such column heights are the main controlling factor for in-place volumes of prospects. The north-eastern Viking Graben ... -
Controls on river patterns in active tectonic settings in the central Italian Apennines
(Master thesis, 2016-05-31)The central Italian Apennines have gone through a complex evolutionary history, involving compression and subsidence, followed by extension and uplift. The last 3 Ma, the area has experienced active extension, and presently ...