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Browsing by Subject "Jarðefnafræði"

Browsing by Subject "Jarðefnafræði"

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    Breiðdalur Central Volcano. What came first: the central volcano or the fissure swarm? 
    Askew, Robert Alexander (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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    A dynamic mid-crustal magma domain revealed by the 2023 to 2024 Sundhnúksgígar eruptions in Iceland 
    Matthews, Simon W.; Caracciolo, Alberto; Bali, Enikő; Halldórsson, Sæmundur A.; Sigmarsson, Olgeir; Guðfinnsson, Guðmundur H.; Pedersen, Gro B. M.; Robin, Jóhann Gunnarsson; Marshall, Edward W.; Aden, Araksan A.; Gísladóttir, Bryndís Ýr; Bosq, Chantal; Auclair, Delphine; Merrill, Heini; Levillayer, Nicolas; Löw, Noëmi; Rúnarsdóttir, Rebekka Hlín; Johnson, Sóley M.; Steinþórsson, Sveinbjörn; Drouin, Vincent (American Association for the Advancement of Science (AAAS), 2024-10-17)
    Mid-crustal magma domains are the source of many basaltic eruptions. Lavas from individual eruptions are often chemically homogeneous, suggesting they derive from single well-mixed magma reservoirs. The 2023-2024 eruptions at Sundhnúksgígar in the ...
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    Hydroclimate in the Pamirs Was Driven by Changes in Precipitation‐Evaporation Seasonality Since the Last Glacial Period 
    Aichner, Bernhard; Makhmudov, Zafar; Rajabov, Ilhomjon; Zhang, Qiong; Pausata, Francesco S. R.; Werner, Martin; Heinecke, Liv; Kuessner, Marie L.; Feakins, Sarah J.; Sachse, Dirk; Mischke, Steffen (American Geophysical Union (AGU), 2019-12-03)
    The Central Asian Pamir Mountains (Pamirs) are a high-altitude region sensitive to climatic change, with only few paleoclimatic records available. To examine the glacial-interglacial hydrological changes in the region, we analyzed the geochemical ...
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    Lipids at high latitudes: investigation of sources, environmental controls, and new potential applications of brGDGT-based paleoclimate proxies 
    Råberg, Jonathan Henrik (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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    Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz 
    Budd, David A.; Troll, Valentin R.; Deegan, Frances M.; Jolis, Ester M.; Smith, Victoria C.; Whitehouse, Martin J.; Harris, Chris; Freda, Carmela; Hilton, David R.; Halldorsson, Saemundur; Ilya N., Ilya N. (Springer Nature, 2017-01-25)
    Quartz is a common phase in high-silica igneous rocks and is resistant to post-eruptive alteration, thus offering a reliable record of magmatic processes in silicic magma systems. Here we employ the 75 ka Toba super-eruption as a case study to show ...
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    The magmatic evolution, eruptive history and geothermal reservoir assessment of the Paka volcanic complex, Northern Kenya rift 
    MIBEI, GEOFFREY (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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    Rapid CO2 mineralisation into calcite at the CarbFix storage site quantified using calcium isotopes 
    Pogge von Strandmann, Philip A. E.; Burton, Kevin W.; Snæbjörnsdóttir, Sandra Ósk; Sigfússon, Bergur; Aradóttir, Edda S.; Gunnarsson, Ingvi; Alfreðsson, Helgi A.; Mesfin, Kiflom G.; Oelkers, Eric H.; Gíslason, Sigurður Reynir (Springer Science and Business Media LLC, 2019-04-30)
    The engineered removal of atmospheric CO 2 is now considered a key component of mitigating climate warming below 1.5 °C. Mineral carbonation is a potential negative emissions technique that, in the case of Iceland’s CarbFix experiment, precipitates ...
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    Refining the climate, glacier, and volcanic history of Iceland during the Holocene 
    Harning, David (University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-04)
    Iceland’s position at the confluence of major oceanic and atmospheric fronts results in a highly sensitive climate evident in both instrumental and paleo records. However, open questions still remain regarding the pre-instrumental evolution of climate, ...
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    A review of statistical tools for morphometric analysis of juvenile pyroclasts 
    Dürig, Tobias; Ross, Pierre-Simon; Dellino, Pierfrancesco; White, James D. L.; Mele, Daniela; Comida, Pier Paolo (Springer Nature, 2021-10-30)
    Morphometric analyses are based on multiparametric datasets that describe quantitatively the shapes of objects. The stochastic nature of fracture-formation processes that break up magma during explosive eruptions yields mixtures of particles that have ...
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    Stable isotopes of volatile elements as a window into the crust and mantle beneath Icelandic volcanoes 
    Ranta, Eemu Johannes (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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    Standardized analysis of juvenile pyroclasts in comparative studies of primary magma fragmentation: 2. Choice of size fraction and method optimization for particle cross-sections 
    Comida, Pier Paolo; Ross, Pierre-Simon; Dürig, Tobias; White, James D. L.; Lefebvre, Nathalie (Springer Nature, 2021-12-27)
    The morphological and textural features of juvenile pyroclasts record crucial details on magma conditions at the time of fragmentation. Their study is therefore essential to better understand the dynamics of explosive eruptions. Unfortunately, the ...
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    Surtsey: Basalt alteration by seawater in a low-temperature geothermal system 
    Prause, Simon (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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    The timing and mechanisms of sulfur release by Icelandic flood lava eruptions: Holuhraun 2014–15 CE and Laki 1783–84 CE a case study. 
    Gallagher, Catherine Rachael (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. ...