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Browsing by Author "Halldórsson, Sæmundur Ari"

Browsing by Author "Halldórsson, Sæmundur Ari"

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    Chlorine isotope ratios record magmatic brine assimilation during rhyolite genesis 
    Ranta, Eemu Johannes; Halldórsson, Sæmundur Ari; Barnes, J. D.; Jónasson, Kristján; Stefánsson, Andri (2021-01-13)
    Magmatic volatile phases within crustal silicic magma domains influence key volcanic processes such as the build up to eruptions and formation of magmatic-hydrothermal ore deposits. However, the extent and nature of fluid-melt interaction in such ...
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    Environmental pressure from the 2014–15 eruption of Bárðarbunga volcano, Iceland 
    Gíslason, Sigurður Reynir; Stefansdottir, Gerdur; Pfeffer, Melissa; Barsotti, Sara; Jóhannsson, Th.; Galeczka, Iwona Monika; Bali, Eniko; Sigmarsson, Olgeir; Stefansson, Andri; Keller, Nicole Simone; Sigurðsson, Á.; Bergsson, Bergur H.; Galle, B.; Jacobo, V.C; Arellano, S.; Aiuppa, A.; Jónasdóttir, Elín Björk; Eiríksdóttir, E.S.; Jakobsson, Sigurður; Guðfinnsson, Guðmundur; Halldórsson, Sæmundur Ari; Gunnarsson, H.; Haddadi, B.; Jonsdottir, Ingibjorg; Thordarson, Thorvaldur; Riishuus, Morten; Högnadóttir, Thórdís; Dürig, Tobias; Pedersen, Gro; Höskuldsson, Ármann; Gudmundsson, Magnus Tumi (European Association of Geochemistry, 2015)
    The effusive six months long 2014-2015 Bárðarbunga eruption (31 August-27 February) was the largest in Iceland for more than 200 years, producing 1.6 ± 0.3 km3 of lava. The total SO2 emission was 11 ± 5 Mt, more than the amount emitted from Europe ...
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    Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, Iceland 
    Hartley, Margaret E.; Bali, Eniko; Maclennan, John; Neave, David A.; Halldórsson, Sæmundur Ari (Springer Nature, 2018-01-12)
    The 2014–2015 Holuhraun eruption, on the Bárðarbunga volcanic system in central Iceland, was one of the best-monitored basaltic fissure eruptions that has ever occurred, and presents a unique opportunity to link petrological and geochemical data with ...
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    Silicon and oxygen isotopes unravel quartz formation processes in the Icelandic crust 
    Kleine, Barbara Irene; Stefansson, Andri; Halldórsson, Sæmundur Ari; Whitehouse, M.J.; Jónasson, Kristján (European Association of Geochemistry, 2018-04)
    Quartz formation processes in the Icelandic crust were assessed using coupled δ18O and δ30Si systematics of silica deposits formed over a wide temperature range (<150 to >550 °C). Magmatic quartz reveals δ18O (-5.6 to +6.6 ‰) and δ30Si (-0.4 ± 0.2 ‰) ...
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    Temporal evolution of primordial tungsten-182 and 3He/4He signatures in the Iceland mantle plume 
    Mundl-Petermeier, A.; Walker, R.J.; Jackson, M.G.; Blichert-Toft, J.; Kurz, M.D.; Halldórsson, Sæmundur Ari (Elsevier BV, 2019-10-20)
    Studies of short-lived radiogenic isotope systems and noble gas isotopic compositions of plume-derived rocks suggest the existence of primordial domains in Earth's present-day mantle. Tungsten-182 anomalies together with high 3He/4He in Phanerozoic ...
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    Unexpected large eruptions from buoyant magma bodies within viscoelastic crust 
    Sigmundsson, Freysteinn; Pinel, Virginie; Grapenthin, Ronni; Hooper, Andrew; Halldórsson, Sæmundur Ari; Einarsson, Páll; Ófeigsson, Benedikt G.; Heimisson, Elias; Jónsdóttir, Kristín; Gudmundsson, Magnus Tumi; Vogfjörð, Kristín; Parks, Michelle; Li, Siqi; Drouin, Vincent; Geirsson, Halldor; Dumont, Stéphanie; Friðriksdóttir, Hildur M.; Guðmundsson, Gunnar B.; Wright, Tim J.; Yamasaki, Tadashi (Springer Science and Business Media LLC, 2020-05-15)
    Large volume effusive eruptions with relatively minor observed precursory signals are at odds with widely used models to interpret volcano deformation. Here we propose a new modelling framework that resolves this discrepancy by accounting for magma ...