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Sæmundur Ari Halldórsson - Research Scientist

Sæmundur Ari Halldórsson

–

School of Engineering and Natural Sciences

Sæmundur Ari Halldórsson

Research Scientist

Geochemistry

Phone
525 - 4741
Email
saemiah [at] hi.is

Unit
Institute of Earth Sciences

Published works

2024

Medieval and recent SO2 budgets in the Reykjanes PeninsulaGeochemical Perspectives Letters
The effect of diffusion on lithium isotope ratios in Icelandic basaltsChemical Geology
Isotopic and kinetic constraints on methane origins in Icelandic hydrothermal fluidsGeochimica et Cosmochimica Acta
A dynamic mid-crustal magma domain revealed by the 2023 to 2024 Sundhnúksgígar eruptions in IcelandScience (New York, N.Y.)
Hydraulically linked reservoirs simultaneously fed the 1975–1984 Krafla Fires eruptionsEarth and Planetary Science Letters
Magmatic Controls on Volcanic Sulfur Emissions at the Iceland HotspotGeochemistry, Geophysics, Geosystems

2023

Rubidium isotopic fractionation during magmatic processes and the composition of the bulk silicate EarthGeochimica et Cosmochimica Acta
Earth's volatile cycles within the crust-mantle systemChemical Geology
Magma plumbing architectures and timescales of magmatic processes during historical magmatism on the Reykjanes Peninsula, IcelandEarth and Planetary Science Letters
No V-Fe-Zn isotopic variation in basalts from the 2021 Fagradalsfjall eruptionGeochemical Perspectives Letters
Ultrahigh-precision noble gas isotope analyses reveal pervasive subsurface fractionation in hydrothermal systemsScience advances
Complex organic matter degradation by secondary consumers in chemolithoautotrophy-based subsurface geothermal ecosystemsPLoS ONE
The indium isotopic composition of the bulk silicate EarthGeochimica et Cosmochimica Acta
Deep magma degassing and volatile fluxes through volcanic hydrothermal systemsJournal of Volcanology and Geothermal Research

2022

Nitrogen Incorporation in Potassic and Micro- and Meso-Porous MineralsAstrobiology
Helium and oxygen isotopic variations in the Iceland plume source controlled by entrainment of recycled oceanic lithosphereEarth and Planetary Science Letters
Evidence from gas-rich ultramafic xenoliths for Superplume-derived recycled volatiles in the East African sub-continental mantleChemical Geology
Rapid shifting of a deep magmatic source at Fagradalsfjall volcano, IcelandNature
Ancient and recycled sulfur sampled by the Iceland mantle plumeEarth and Planetary Science Letters
Boron isotope evidence for devolatilized and rehydrated recycled materials in the Icelandic mantle sourceEarth and Planetary Science Letters
Oxygen isotope evidence for progressively assimilating trans-crustal magma plumbing systems in IcelandGeology
Nitrogenous Altered Volcanic Glasses as Targets for Mars Sample ReturnJournal of Geophysical Research: Planets
Spatial distribution and geochemical characterization of Icelandic mantle end-membersChemical Geology
Seismic VolcanostratigraphyGeochemistry, Geophysics, Geosystems
Barium isotopes in ocean island basalts as tracers of mantle processesGeochimica et Cosmochimica Acta

2021

The Mercury Isotopic Composition of Earth's Mantle and the Use of Mass Independently Fractionated Hg to Test for Recycled CrustGeophysical Research Letters
Linking deeply-sourced volatile emissions to plateau growth dynamics in southeastern Tibetan PlateauNature Communications
The use of noble gas isotopes to trace subsurface boiling temperatures in Icelandic geothermal systemsEarth and Planetary Science Letters
Helium-carbon systematics of groundwaters in the Lassen Peak RegionChemical Geology
Isotope Systematics of Volatile Elements in Icelandic Thermal Fluid
Subduction-Driven Volatile Recycling: A Global Mass BalanceAnnual Review of Earth and Planetary Sciences
Chlorine isotope ratios record magmatic brine assimilation during rhyolite genesisGeochemical Perspectives Letters
He-CO2-N2 isotope and relative abundance characterization of geothermal fluids from the Ethiopian Rift
Characterising Geothermal Fluids of the Askja and Kverkfjöll Volcanic Systems, Iceland
Instrumental mass fractionation during sulfur isotope analysis by secondary ion mass spectrometry in natural and synthetic glassesChemical Geology
Timescales of crystal mush mobilization in the Bárðarbunga-Veiðivötn volcanic system based on olivine diffusion chronometryAmerican Mineralogist
High 3He/4He in central Panama reveals a distal connection to the Galapagos plumeProceedings of the National Academy of Sciences of the United States of America
Accuracy of Otolith Oxygen Isotope Records Analyzed by SIMS as an Index of Temperature Exposure of Wild Icelandic Cod (Gadus morhua)Frontiers in Marine Science

2020

Temporal evolution of magma and crystal mush storage conditions in the Bárðarbunga-Veiðivötn volcanic system, IcelandLithos
Unexpected large eruptions from buoyant magma bodies within viscoelastic crustNature Communications
Ancient helium and tungsten isotopic signatures preserved in mantle domains least modified by crustal recyclingProceedings of the National Academy of Sciences of the United States of America
Contrasting old and young volcanism from aitutaki, cook islandsJournal of Petrology
Hydrothermal ¹⁵N¹⁵N abundances constrain the origins of mantle nitrogenNature
Olivine chemistry reveals compositional source heterogeneities within a tilted mantle plume beneath IcelandEarth and Planetary Science Letters
Impact of fluid-rock interaction on water uptake of the Icelandic crust: Implications for the hydration of the oceanic crust and the subducted water fluxEarth and Planetary Science Letters

2019

Forearc carbon sink reduces long-term volatile recycling into the mantleNature
Clinopyroxene-Liquid Equilibria and Geothermobarometry in Natural and Experimental TholeiitesJournal of Petrology
Author CorrectionNature
Author CorrectionNature
Temporal evolution of primordial tungsten-182 and 3He/4He signatures in the Iceland mantle plumeChemical Geology
Hot and Heterogenous High-³He/⁴He ComponentsGeochemistry, Geophysics, Geosystems

2018

Spatial distribution of helium isotopes in Icelandic geothermal fluids and volcanic materials with implications for location, upwelling and evolution of the Icelandic mantle plumeChemical Geology
Petrology and geochemistry of the 2014–2015 Holuhraun eruption, central IcelandContributions to Mineralogy and Petrology
Silicon and oxygen isotopes unravel quartz formation processes in the Icelandic crustGeochemical Perspectives Letters
Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, IcelandContributions to Mineralogy and Petrology
Melt inclusion constraints on volatile systematics and degassing history of the 2014–2015 Holuhraun eruption, IcelandContributions to Mineralogy and Petrology

2017

Isotope systematics of Icelandic thermal fluidsJournal of Volcanology and Geothermal Research
Gosið í Holuhrauni 2014–2015. Magn gosefna, dreifing mengunar og mikilvægi tímasetningar og staðsetningar eldgosa með tilliti til umhverfisáhrifa
Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartzScientific Reports
Geochemistry and petrology of Holocene lavas in the Bárðardalur region, N-Iceland. Part IJokull

2016

ErratumGeochimica et Cosmochimica Acta
The Nature of Volcanism in the Environs of the Tanzanian Craton: the case of Rungwe Volcanic Province
Recycling of crustal material by the Iceland mantle plumeGeochimica et Cosmochimica Acta
Gradual caldera collapse at Bárdarbunga volcano, Iceland, regulated by lateral magma outflowScience
Subducted lithosphere controls halogen enrichments in the Iceland mantle plume sourceGeology

2015

Environmental pressure from the 2014–15 eruption of Bárðarbunga volcano, IcelandGeochemical Perspectives Letters
New paleointensity results from rapidly cooled Icelandic lavasJournal of Geophysical Research: Solid Earth
Evidence for primordial water in Earth's deep mantleScience
Delimiting Bárðarbunga and Askja volcanic systems with Sr-and Nd-isotope ratiosJokull
Environmental pressure from the 2014-15 eruption of Baröarbunga volcano, IcelandGeochemical Perspectives Letters

2014

Carbon isotope and abundance systematics of Icelandic geothermal gases, fluids and subglacial basalts with implications for mantle plume-related CO₂ fluxesGeochimica et Cosmochimica Acta
A common mantle plume source beneath the entire East African Rift System revealed by coupled helium-neon systematicsGeophysical Research Letters
Trace element and Sr-Nd-Pb isotope geochemistry of Rungwe Volcanic Province, Tanzania: implications for a Superplume source for East Africa Rift magmatismFrontiers in Earth Science

2013

Resolving volatile sources along the western Sunda arc, IndonesiaChemical Geology
Physicochemical characterization and stability of microbeads containing cod-liver oil encircled with natural cyclodextrinsJournal of Inclusion Phenomena and Macrocyclic Chemistry

2012

High precision nitrogen isotope measurements in oceanic basalts using a static triple collection noble gas mass spectrometerGeochemistry, Geophysics, Geosystems
Traversing nature's danger zoneGeology Today
Spatial variations in gas and stable isotope compositions of thermal fluids around Lake VanChemical Geology

2011

Helium isotopes at Rungwe Volcanic Province, Tanzania, and the origin of East African PlateauxGeophysical Research Letters

2010

Apparent decoupling of the He and Ne isotope systematics of the Icelandic mantleGeochimica et Cosmochimica Acta

2008

Isotopic-heterogeneity of the Thjorsa lava-Implications for mantle sources and crustal processes within the Eastern Rift Zone, IcelandChemical Geology

Keywords for Specialisation:

Igneous petrology

Isotope Geochemistry