Department of Earth Science: Nye registreringer
Viser treff 1-20 av 1127
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An experimental study of the effect of water and chlorine on plagioclase nucleation and growth in mafic magmas: application to mafic pegmatites
(Journal article; Peer reviewed, 2023)In this study, the effects of H2O and Cl on the grain size and nucleation delay of plagioclase in basaltic magma were investigated using dynamic and equilibrium experiments at 1150 ∘C, 300 MPa, and oxygen fugacity between ... -
Fault sealing and fluid contact control in Gullfaks Sør
(Master thesis, 2023-11-06)In subsurface reservoirs, understanding the fault sealing capacity is important to predict the amount of hydrocarbons present in the reservoirs. Some earlier literature has emphasized using shale gouge ratio (SGR) to predict ... -
Interpretation of 3D Ground Penetrating Radar data in archaeology by applying seismic attributes
(Master thesis, 2023-11-20)Ground Penetrating Radar (GPR) has emerged as a widely employed geophysical method in archaeological studies, with recent advancements leading to large-scale, high-resolution surveys. The processing techniques applied to ... -
On the importance of temperature and precipitation changes for glacial ice sheet stability
(Master thesis, 2023-11-20)Ice sheets undergo periodic advances and retreats, resulting in glacial-interglacial cycles. The Last Glacial Period is widely believed as involving a long-time buildup phase followed by a rapid termination over approximately ... -
Assessing the influence of supraglacial lakes to the mass balance of Tapado Glacier
(Master thesis, 2023-11-27)Glaciers are an important source of water for agriculture, mining and large population residing in downstream basins in the semiarid Andes. The Tapado Complex (2.44 km2) is the main glacier in the catchment Coquimbo-La ... -
Architecture and Sedimentology of Late Weichselian Delta Deposit in Vie, Førde Norway
(Master thesis, 2023-12-04)An early Holocene glacier front deposit of a lower outwash fan and an upper delta, at Vie sandpit next to the town of Førde in Sunnfjord municipality in western Norway has been investigated using various fields methods, ... -
Temperature variation in caves and its significance for subterranean ecosystems
(Journal article; Peer reviewed, 2023)Climate change affects all ecosystems, but subterranean ecosystems are repeatedly neglected from political and public agendas. Cave habitats are home to unknown and endangered species, with low trait variability and intrinsic ... -
Configuration of the Scandinavian Ice Sheet in southwestern Norway during the Younger Dryas
(Journal article; Peer reviewed, 2023)The extent of the Scandinavian Ice Sheet in southwestern Norway is precisely located during the well-characterized Younger Dryas re-advance. However, the thickness of the ice sheet is less well constrained inland from the ... -
Atlantic inflow and low sea-ice cover in the Nordic Seas promoted Fennoscandian Ice Sheet growth during the Last Glacial Maximum
(Journal article; Peer reviewed, 2023)The Atlantic water inflow into the Nordic Seas has proven difficult to reconstruct for the Last Glacial Maximum. At that time, the Fennoscandian Ice Sheet grew potentially to its maximum extent. Sea-ice free conditions in ... -
A matrix-free variant of the distorted Born iterative method for seismic full-waveform inversion
(Journal article; Peer reviewed, 2023)The distorted Born iterative method reduces a nonlinear inverse scattering problem to a sequence of (ill-posed) linear inverse scattering problems that can be solved using a regularized least-squares formulation. This ... -
Coastal permafrost was massively eroded during the Bølling-Allerød warm period
(Journal article; Peer reviewed, 2023)The Bølling-Allerød interstadial (14,700–12,900 years before present), during the last deglaciation, was characterized by rapid warming and sea level rise. Yet, the response of the Arctic terrestrial cryosphere during this ... -
Limited exchange between the deep Pacific and Atlantic oceans during the warm mid-Pliocene and Marine Isotope Stage M2 “glaciation”
(Journal article; Peer reviewed, 2023)The Piacenzian stage (3.6–2.6 Ma) of the Pliocene is the most recent period where Earth experienced sustained intervals of global warmth analogous to predicted near-future climates. Despite considerable efforts to characterize ... -
Mechanical properties of selected granitoids along the Karora hydropower project, Besham, Northern Pakistan: Insights from petrography and joint analysis
(Journal article; Peer reviewed, 2023)The stability of tunnel site depends upon the deformation behaviors of the surrounding rocks, including joint density, mineral composition, micro cracks, and grain boundaries. The aim of this study was to analyze the ... -
Transient Deep Ocean Cooling in the Eastern Equatorial Pacific Ocean at the Eocene-Oligocene Transition
(Journal article; Peer reviewed, 2023)At the Eocene-Oligocene Transition (EOT), approximately 34 million years ago, Earth abruptly transitioned to a climate state sufficiently cool for Antarctica to sustain large ice sheets for the first time in tens to hundreds ... -
Microseismic wavefield modelling in anisotropic elastic media using integral equation method
(Journal article; Peer reviewed, 2023)In this paper, we present a frequency-domain volume integral method to model the microseismic wavefield in heterogeneous anisotropic-elastic media. The elastic wave equation is written as an integral equation of the ... -
"Candidatus Subterrananammoxibiaceae," a New Anammox Bacterial Family in Globally Distributed Marine and Terrestrial Subsurfaces
(Journal article; Peer reviewed, 2023)Bacteria specialized in anaerobic ammonium oxidation (anammox) are widespread in many anoxic habitats and form an important functional guild in the global nitrogen cycle by consuming bio-available nitrogen for energy rather ... -
Aftershock study of the 2019 Ambon earthquake using moment tensor inversion: identification of fault reactivation in northern Banda, Indonesia
(Journal article; Peer reviewed, 2023)On September 26, 2019, an Mw 6.5 earthquake occurred 23 km northeast of Ambon City, Indonesia, followed by numerous aftershock series related to a complex fault network reactivation in the Ambon and Seram region. Using ... -
Constraining the tectonic evolution of rifted continental margins by U–Pb calcite dating
(Journal article; Peer reviewed, 2023)We employ U–Pb calcite dating of structurally-controlled fracture fills within crystalline Caledonian basement in western Norway to reveal subtle large-scale tectonic events that affected this rifted continental margin. ... -
Lithological controls on architecture and development of igneous intrusions in sedimentary basins.
(Doctoral thesis, 2023-11-24)Magmatransport i jordskorpen forekommer igjennom magmatiske intrusjoner (siller og diker), som ofte omtales som et magmatisk rørsystem. Disse nettverkene av magma finnes i de fleste sedimentære bassenger over hele verden, ... -
Paleoceanographic reconstructions across the Plio-Pleistocene from clumped isotope thermometry
(Doctoral thesis, 2023-12-06)Bruk av isotopklyngetermometri (Δ47) på foraminiferer er en relativt ny tilnærming for å estimere havtemperaturer tilbake i tid. I motsetning til mange andre paleotermometre gir denne metoden temperaturer som er upåvirket ...