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Browsing Doktorsritgerðir- HÍ by Department "Jarðvísindadeild (HÍ)"
Now showing items 1-20 of 38
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2024-04)This thesis describes the evidence of palaeo-ice streams in northeast Iceland. Ice streams within the Iceland Ice Sheet (IIS) had been previously proposed, but limited studies existed on their geomorphology. The aim of this study was to advance the ... -
(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2023-03)The chemical interaction between seawater and basalt at low temperatures (≤150°C) ranks among the more significant factors controlling the composition of seawater and the oceanic crust. However, the time-integrated geochemical and petrographic outcomes ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2023-01-06)The volcanic island of Surtsey, off the south coast of Iceland, was formed by shallow ocean-emergent basaltic volcanism in 1963-1967. There were several episodes of activity, migrating between five vents (Surtur, Surtla, Surtungur, Syrtlingur and Jólnir) ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2022-12)Post-eruptive deformation following volcanic eruptions may originate from continued magma movements, or reflect delayed and continued Earth adjustment due to co-eruptive events, often referred to as viscoelastic relaxation. Post-eruptive deformation ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021)Flood lavas (FL), or high magnitude (1–100 km3) basaltic fissure eruptions have a recurrence interval of 250–500 years in Iceland. These events can produce atmospheric volcanic pollution at tropospheric–stratospheric levels via their sulfur (S) emissions. ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2022-02-25)Volatile species (e.g., H2O, He, B, CO2, S, Cl) and their isotopes in volcanic materials provide a unique, but underexplored archive of information about magmatic processes and planetary evolution. This study aims to improve our understanding regarding ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2022)As high latitude regions continue a decades-long trend of warming at roughly twice the rate of the global average, an understanding of their climatic histories becomes increasing important for predicting their future. Organic molecular proxies preserved ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021-10)In this study, the magmatic evolution and the eruptive history of the Paka volcanic complex are investigated and its geothermal reservoir is assessed. The study comprises two parts. The first part deals with the eruptive history, magma evolution, and ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021-02)Phosphorus is an essential yet irreplaceable macronutrient for agriculture and thus plays a key role in global food security. Most of the phosphate fertilizers are produced from phosphate rock, a finite mineral resource that is mined and processed at ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021-02)The physico-chemical properties of magma storage reservoirs in multi-level magmatic systems may change with time, along with the timescales at which crystals and melts are processed throughout the crust. In this thesis, I use an integrated approach ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021-01)The extent of compositional and lithological heterogeneity in Earth’s convecting mantle, caused by the recycling of oceanic and continental lithosphere, has long been a subject of interest to geochemists and geophysicists. A fundamental outstanding ...
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(University of Turku; University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2020-11-13)Tephrochronology is a high-precision dating method that uses volcanic ash horizons as isochrons in correlating and dating geological records and archaeological sites. First developed in the volcanic regions of the world, tephrochronology has expanded ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2020-05-15)This study focused on the tectono-magmatic reconstruction of the Jan Mayen microcontinent (JMMC) and Iceland Plateau Rift (IPR) in context to the breakup and opening processes of the Northeast Atlantic region. Joint interpretation of densely spaced ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2020-04-29)The purpose of this thesis is to employ remote sensing to study lava flow products during the 2014-2015 eruption at Holuhraun, Iceland. Multimodal remote sensing techniques and datasets were applied and developed for three study themes (1) deriving ...
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(Faculty of Science, University of Helsinki; Faculty of Earth Sciences, University of Iceland, 2020-03-20)This thesis provides insights into the petrogenesis of Iceland basalts via three subprojects. The first uses olivine macrocrysts as a proxy for mantle melting conditions below Iceland, the second utilizes petrological thermobarometry to resolve the ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2020-03)Supercritical fluids have been reported from both rift and subduction-related geothermal systems. They typically form in the vicinity of magmatic intrusions at the roots of geothermal systems upon conductive heating and boiling of the subcritical ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2020-01)The Breiðdalur volcanic system, eastern Iceland, comprises of a ~600 km3 central volcano, a 30 - 40 km long dyke swarm and plateau basalts erupted from this dyke swarm. The entire volcanic system was active from 10.1 to 7.8 Ma, the central volcano was ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-12-13)An extensive geophysical survey comprising over 400 MT and 515 gravity stations on the Korosi, Paka and Silali volcanoes in the northern Kenya rift was conducted in order to assess the occurrence of geothermal resources in the context of the geophysics ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-11)Large and complete sections through glacial landforms formed in subaqueous environments are rare, impeding our knowledge of their internal composition and the processes responsible for their formation. Following the last deglaciation of the Icelandic ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-10-23)The reduction of carbon dioxide (CO2) emissions in the atmosphere is currently one of the main challenges facing humanity. One solution is carbon capture from concentrated sources and directly from the atmosphere, and long term storage in rocks. Basaltic ...
Now showing items 1-20 of 38