Browsing Department of Earth Science by Title
Now showing items 1033-1050 of 1050
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Vertikal utbredelse av glasialt transportert materiale på Gaustatoppen
(Master thesis, 2015-09-03)Gaustatoppen (1883 m o.h.) er en ikonisk fjelltopp i Sør-Norge, der det tidligere er gjort få kvartærgeologiske undersøkelser. På bakgrunn av blokkhavet som dekker fjellmassivet og toppens høyde i forhold til omkringliggende ... -
Visual Techniques for Geological Fieldwork Using Mobile Devices
(Doctoral thesis, 2017-10-06)Visual techniques in general and 3D visualisation in particular have seen considerable adoption within the last 30 years in the geosciences and geology. Techniques such as volume visualisation, for analysing subsurface ... -
Volcanic evolution of an ultraslow-spreading ridge
(Journal article; Peer reviewed, 2023)Nearly 30% of ocean crust forms at mid-ocean ridges where the spreading rate is less than 20 mm per year. According to the seafloor spreading paradigm, oceanic crust forms along a narrow axial zone and is transported away ... -
The Volcanic Hazards of Jan Mayen Island (North-Atlantic)
(Journal article; Peer reviewed, 2022)Hazard assessment of remote volcanic islands provides many challenges compared to other volcanoes and volcanic fields. Here we present the first systematic volcanic hazard assessment of Jan Mayen Island, a remote island ... -
Volcanic rocks at the Møre Marginal High: geochemistry, petrogenesis and emplacement mechanisms
(Master thesis, 2017-06-13)The opening of the Norwegian-Greenland Sea at the Paleocene−Eocene transition was accompanied by extensive magmatic activity, giving rise to the North Atlantic Igneous Province. The magmatic activity is today manifested ... -
Volcanically hosted venting with indications of ultramafic influence at Aurora hydrothermal field on Gakkel Ridge
(Journal article; Peer reviewed, 2022)The Aurora hydrothermal system, Arctic Ocean, hosts active submarine venting within an extensive field of relict mineral deposits. Here we show the site is associated with a neovolcanic mound located within the Gakkel Ridge ... -
Volcaniclastic Dispersal During Submarine Lava Effusion: The 2012 Eruption of Havre Volcano, Kermadec Arc, New Zealand
(Journal article; Peer reviewed, 2020)Understanding clast dispersal from subaqueous volcanism is hampered by uncertainty in the source and extent of seafloor deposits. Extensive sampling in situ of seafloor deposits from the 2012 submarine eruption of Havre ... -
Vurdering og tentativ kvantifisering av stislitasje i Geirangerfjorden verdsarvområde
(Master thesis, 2022-06-01)Ferdsel i stiar fører til auka erosjon i lausmassane og slitasje på forvitringshuda til dei harde overflatene i stiane. Problemstillinga i denne oppgåva omhandlar tentativ kvantifisering av stislitasje i lausmassar og på ... -
Warm Middle Miocene Indian Ocean Bottom Water Temperatures: Comparison of Clumped Isotope and Mg/Ca‐Based Estimates
(Journal article; Peer reviewed, 2020)The middle Miocene is an important analogue for potential future warm climates. However, few independent deep ocean temperature records exist, though these are important for climate model validation and estimates of changes ... -
Was common Era glacier expansion in the Arctic Atlantic region triggered by unforced atmospheric cooling?
(Peer reviewed; Journal article, 2019-08-05)The timing and causes of Common Era (CE) glacier growth in the Arctic Atlantic region remain elusive. There is mounting evidence of advances that predate the Little Ice Age (1250–1850 CE); this challenges the view that ... -
Water Migration in the Subduction Mantle Wedge: A Two-Phase Flow Approach
(Journal article; Peer reviewed, 2019)Subduction zones are the main entry points of water into Earth's mantle and play an important role in the global water cycle. The progressive release of water by metamorphic dehydration induces important physical‐chemical ... -
Wavefield Migration Imaging of Moho Geometry and Upper Mantle Structure Beneath Southern New England
(Journal article; Peer reviewed, 2022)The crust and upper mantle beneath the New England Appalachians exhibit a large offset of the Moho across the boundary between Laurentia and accreted terranes and several dipping discontinuities, which reflect Paleozoic ... -
Weathering of deep-sea hydrothermal sulfide deposits. Stability of heavy metals and implications for future mining activities
(Master thesis, 2016-12-20)During future mining operations on seafloor massive sulfide deposits, sulfidic material will be reworked and relocated at the seafloor, exposing the material to oxic conditions. In an oxic environment sulfidic material ... -
West Spitsbergen fold and thrust belt: A digital educational data package for teaching structural geology
(Journal article; Peer reviewed, 2023)The discipline of structural geology is taking an advantage of compiling observations from multiple field sites to comprehend the bigger picture and constrain the region's geological evolution. In this study we demonstrate ... -
Wide Versus Narrow Back-Arc Rifting: Control of Subduction Velocity and Convective Back-Arc Thinning
(Journal article; Peer reviewed, 2022)Back-arc basins such as the ones behind the island-arcs of the Western Pacific Ocean or the ones in the Mediterranean Sea are ubiquitous structures of the Earth. They are extensional basins forming in the overriding plate ... -
Widespread glacial erosion on the Scandinavian passive margin
(Journal article; Peer reviewed, 2021)The topography in Scandinavia features enigmatic high-elevation low-relief plateau regions dissected by deep valleys and fjords. These plateau regions have long been interpreted as relict landforms of a preglacial origin, ... -
Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability
(Journal article; Peer reviewed, 2021)We investigate winter Arctic Amplification (AA) on synoptic timescales and at regional scales using a daily version of the Arctic Amplification Index (AAI) and examine causes on a synoptic scale. The persistence, frequency ... -
Zippered Shear Zone Model for Interacting Shear Zones in the Borborema Province, Brazil, as Constrained by U-Pb Dating
(Peer reviewed; Journal article, 2019)Shear zones typically interact to form connected systems or networks to accommodate crustal deformation, but our knowledge of how this happens is fragmentary. Understanding branching and interacting shear zones requires ...