Skip to main content

EN
ÍS

Forsíða

Forsíða

Guðmundur Heiðar Guðfinnsson - Fræðimaður

Guðmundur Heiðar Guðfinnsson

–

Verkfræði- og náttúruvísindasvið

Guðmundur Heiðar Guðfinnsson

Fræðimaður

Fræðimaður

Aðsetur
Askja / N-148
Sími
5254148
Tölvupóstur
gudmhg [hjá] hi.is

Starfseining
Jarðvísindastofnun

ORCID vefsíða
https://orcid.org/0000-0003-3275-9866
Rannsóknagátt – Guðmundur Heiðar Guðfinnsson

Útgefið efni

2025

Deconvolution of high and low-temperature alteration processes along the contact zones of basaltic-dike intrusions in basaltic host rocks of different permeabilities – implications for geothermal explorationGeothermics

2024

Hydraulically linked reservoirs simultaneously fed the 1975–1984 Krafla Fires eruptionsEarth and Planetary Science Letters
A dynamic mid-crustal magma domain revealed by the 2023 to 2024 Sundhnúksgígar eruptions in IcelandScience (New York, N.Y.)
Magmatic Controls on Volcanic Sulfur Emissions at the Iceland HotspotGeochemistry, Geophysics, Geosystems

2023

Magma plumbing architectures and timescales of magmatic processes during historical magmatism on the Reykjanes Peninsula, IcelandEarth and Planetary Science Letters
Deep magma mobilization years before the 2021 CE Fagradalsfjall eruption, IcelandGeology

2022

Oxygen isotope evidence for progressively assimilating trans-crustal magma plumbing systems in IcelandGeology
Ancient and recycled sulfur sampled by the Iceland mantle plumeEarth and Planetary Science Letters
Melting Phase Equilibria from 4 to 7 GPa in the System CaO-MgO-Al₂O₃-SiO₂-CO₂, the Persistence of the “Ledge” in Carbonated Basalt with Excess Silica, and the Most Likely Limits on the Depths of Termination of Carbon Cycle at Subduction ZonesJournal of Petrology
Rapid shifting of a deep magmatic source at Fagradalsfjall volcano, IcelandNature
Reservoir characterization of the Paka geothermal system in KenyaGeothermics

2021

Partial melt generation and evolution of magma reservoir conditions at the Paka volcanic complex in KenyaLithos
Warm and slightly reduced mantle under the off-rift snefellsnes volcanic zone, icelandJournal of Petrology
Timescales of crystal mush mobilization in the Bárðarbunga-Veiðivötn volcanic system based on olivine diffusion chronometryAmerican Mineralogist
Conditions and Dynamics of Magma Storage in the Snæfellsnes Volcanic Zone, Western IcelandJournal of Petrology
A Reappraisal of Peridotite Solidus Phase Equilibria from 6 to 14 GPa in the System CaO-MgO-AlO-SiOJournal of Petrology
Eruptive history and volcano-tectonic evolution of Paka volcanic complex in the northern Kenya riftJournal of African Earth Sciences

2020

Olivine chemistry reveals compositional source heterogeneities within a tilted mantle plume beneath IcelandEarth and Planetary Science Letters
Major and trace element partitioning between majoritic garnet and carbon dioxide-rich liquid in model carbonated peridotite at 10 GPa and interpretations of the element chemistry of majoritic garnet inclusions in diamonds from the subcontinental mantle of Brazil and GuineaLithos
Updated geothermal model, power capacity estimates and financial model for resource development in Paka geothermal Field
Geothermal energy and ore-forming potential of 600 °C mid-ocean-ridge hydrothermal fluidsGeology
Temporal evolution of magma and crystal mush storage conditions in the Bárðarbunga-Veiðivötn volcanic system, IcelandLithos

2019

Clinopyroxene-Liquid Equilibria and Geothermobarometry in Natural and Experimental TholeiitesJournal of Petrology
Signature of deep mantle melting in South Iceland olivineContributions to Mineralogy and Petrology
Mid-crustal storage and crystallization of Eyjafjallajökull ankaramites, South IcelandJokull

2018

Zircon and apatite-bearing pyroxene hornblendite mantle xenolith from Hungary, Carpathian-Pannonian regionLithos
Quantitative measurement of olivine composition in three dimensions using helical-scan X-ray micro-tomographyAmerican Mineralogist
Melt inclusion constraints on volatile systematics and degassing history of the 2014–2015 Holuhraun eruption, IcelandContributions to Mineralogy and Petrology
Petrology and geochemistry of the 2014–2015 Holuhraun eruption, central IcelandContributions to Mineralogy and Petrology

2017

Gosið í Holuhrauni 2014–2015. Magn gosefna, dreifing mengunar og mikilvægi tímasetningar og staðsetningar eldgosa með tilliti til umhverfisáhrifa
Geochemistry and petrology of Holocene lavas in the Bárðardalur region, N-Iceland. Part IJokull
Trace element systematics of olivine from historical eruptions of Lanzarote, Canary IslandsChemical Geology

2016

Gradual caldera collapse at Bárdarbunga volcano, Iceland, regulated by lateral magma outflowScience
Gradual caldera collapse at Bárdarbunga volcano, Iceland, regulated by lateral magma outflowScience

2015

Environmental pressure from the 2014–15 eruption of Bárðarbunga volcano, IcelandGeochemical Perspectives Letters

2014

Melting phase relations of model carbonated peridotite from 2 to 3 GPa in the system CaO-MgO-Al₂O₃-SiO₂-CO₂ and further indication of possible unmixing between carbonatite and silicate liquidsJournal of Geophysical Research: Solid Earth
Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al₂O₃-SiO₂-CO₂ and kimberlitic Liquids in the Earth's upper mantleAmerican Mineralogist
IDDP-The chemistry of the IDDP-01 well fluids in relation to the geochemistry of the Krafla geothermal systemGeothermics

2013

Silicate liquid-carbonatite liquid transition along the melting curve of model, vapor-saturated peridotite in the system CaO-MgO-Al₂O ₃-SiO₂-CO₂ from 1.1 to 2 GPaJournal of Geophysical Research: Solid Earth

2011

Melting phase relations of simplified carbonated peridotite at 12-26 gpa in the systems CaO-MgO-SiO₂-CO₂ and CaO- Mgo-al₂O₃-SiO₂-CO₂Journal of Petrology
Xenon and ArgonGeochimica et Cosmochimica Acta
Oceanic volcanism from the low-velocity zone - without mantle plumesJournal of Petrology

2010

Porosity, density and chemical composition relationships in altered icelandic hyaloclastites
Experimentally dictated stability of carbonated oceanic crust to moderately great depths in the EarthJournal of Geophysical Research: Solid Earth

2009

Experimental constraints on rutile saturation during partial melting of metabasalt at the amphibolite to eclogite transition, with applications to TTG genesisAmerican Mineralogist

2008

Origin of the oceanic lithosphereJournal of Petrology
Primary carbonatite melt from deeply subducted oceanic crustNature

2006

Response to the comment by M. Lustrino on "High-pressure melting experiments on garnet clinopyroxenite and the alkalic-tholeiitic transition in ocean-island basalts" by Keshav et al. [Earth Planet. Sci. Lett. 223, 365-379 (2004)]Earth and Planetary Science Letters

2005

Kimberlite petrogenesisGeochimica et Cosmochimica Acta
Carbonate-rich melts in the oceanic low-velocity zone and deep mantleSpecial Paper of the Geological Society of America
Continuous gradations among primary carbonatitic, kimberlitic, melilititic, basaltic, picritic, and komatiitic melts in equilibrium with garnet lherzolite at 3-8 GPaJournal of Petrology

2004

High-pressure melting experiments on garnet clinopyroxenite and the alkalic to tholeiitic transition in ocean-island basaltsEarth and Planetary Science Letters
Silica-poor, mafic alkaline lavas from ocean islands and continentsProceedings of the Indian Academy of Sciences, Earth and Planetary Sciences

2002

Generation of mid-ocean ridge basalts at pressures from 1 to 7 GPaGeochimica et Cosmochimica Acta

2001

A pressure-independent geothermometer for primitive mantle meltsJournal of Geophysical Research: Solid Earth

2000

Melting behaviour of model lherzolite in the system CaO-MgO-Al₂O₃-SiO₂-FeO at 0.7-2.8 GPaJournal of Petrology

1998

The effect of trace elements on the olivine-wadsleyite transformationAmerican Mineralogist

1996

Melting relations of model lherzolite in the system CaO-MgO-Al₂O₃-SiO₂ at 2.4-3.4 GPa and the generation of komatiitesJournal of Geophysical Research B: Solid Earth

Sérsvið:

Umsjón örgreinis