Responsabilités scientifiques et administratives :

• Responsable de l’équipe de géochimie du LMV (depuis fin 2001)
• Membre du comité scientifique de la Coordination de Recherches Volcanologiques, CNRS UMS 833
• Encadrement de 2 DEA et 1 thèse, co-encadrement de 1 DEA et 1 thèse .

Conférences invitées et activités internationales :

• Ecole Normal Supérieure de Lyon, France, 1999: Déséquilibre radioactif dans les magmas d’arcs.
• University of Iceland, Reykjavik, 2000. Nuclear volcanology or short-lived nuclides and rates of magmatic processes.
• Bern University, Switzerland, 2000. Constraints from U-series on timescales for magma transport and residence time
• University of Geneva, Switzerland, 2001. Magma transfer rate beneath the Southern Volcanic Zone (Chile) and Piton de la Fournaise volcano.
• Geological society of Iceland, 2002: How long does magma dwell beneath Icelandic volcanoes?
• Nordic Volcanological Institut, 2002: Magma transfer rate beneath Chilian volcanoes and Piton de la Fournaise, Reunion Island.
• Séjour de quatre mois a l’Institute Scientifique de l’Université d’Islande .

Publications LMV depuis 2010 :

Articles scientifiques

• Marshall E.W., Caracciolo A., Bali E., Halldórsson S.A., Matthews S., Ranta E., Rasmussen M.B., Robin J.G., Guðfinnson G.H., Maclennan J., Bosq C. , Auclair D. , Sigmarsson O. , Gísladóttir B., Johnson S., Löw N., Stracke A., Genske F. (2024) . The petrology and geochemistry of the 2021 fagradalsfjall eruption, iceland: an eruption sourced from multiple, compositionally diverse, near‐moho sill. AGUADVANCES (AGU Advances) . vol.5, p.e2024AV001310, DOI
• Matthews S.W., Caracciolo A., Bali E., Halldórsson S., Sigmarsson O. , Guðfinnsson G., Pedersen G.B.M., Gunnarsson Robin J., Marshall E.W., Aden A.A., Ýr Gísladóttir B.B., Bosq C. , Auclair D. , Merrill H., Levillayer N., Löw N., Hlín Rúnarsdóttir R., Johnson S.M., Steinþórsson S., Drouin D. (2024) . A dynamic mid crustal magma domain revealed by the 2023 to 2024 sundhnuksgigar eruptions, iceland. SCIENCES (Science) . DOI
• Sigmarsson O. , Larsen G., Hervé-Carpentier G. (2024) . Rapid differentiation of mafic to intermediate magma constrained by ra–th disequilibrium and the size of magma chamber beneath hekla volcano, iceland. CONTMP (Contributions to Mineralogy & Petrology) . vol.179, DOI

• Sigmarsson O. (2023) . Reply to comment on “long or short silicic magma residence time beneath hekla volcano, iceland?” by sigmarsson o, bergþórsdóttir i a, devidal j‑l, larsen g, gannoun a. CONTMP (Contributions to Mineralogy & Petrology) . vol.178, p.72, DOI

• Flaherty T. , Druitt T. , Francalanci L., Schiano P. , Sigmarsson O. (2022) . Temporal variations in the diversity of primitive melts supplied to the santorini silicic magmatic system and links to lithospheric stresses. CONTMP (Contributions to Mineralogy & Petrology) . vol.177, p.79, DOI
• Halldórsson S.A., Marshall E.W., Caracciolo A., Matthews S., Bali E., Rasmussen M.B., Ranta E., Gunnarsson Robin J., Guðfinnsson G.H., Sigmarsson O. , Maclennan J., Jackson M.G., Whitehouse M.J., Jeon H., van der Meer Q.H.A., Mibei G.K., Pfeffer M.A., Scott S.W., Kjartansdóttir R., Kleine B.I., Oppenheimer C., Aiuppa A., Ilyinskaya E., Bitetto M., Giudice G., Stefánsson A. (2022) . Rapid source shifting of a deep magmatic system revealed by the fagradalsfjall eruption, iceland. NATURE (Nature) . vol.609, p.529-534, DOI
• Sigmarsson O. , Bergþórsdóttir I.A., Devidal J.L. , Larsen G., Gannoun A.M. (2022) . Long or short silicic magma residence time beneath hekla volcano, iceland?. CONTMP (Contributions to Mineralogy & Petrology) . vol.177, p.13, DOI

• Vlastélic I. , Bachèlery P. , Sigmarsson O. , Koga K. , Rose-Koga E. , Bindeman I., Gannoun A.M. , Devidal J.L. , Falco G., Staudacher T. (2021) . Prolonged trachyte storage and unusual remobilization at piton de la fournaise, la réunion island, indian ocean: li, o, sr, nd, pb and th isotope study. JOURPETRO (Journal of Petrology) . DOI
• Oladottir B.A., Thordarson T., Larsen G., Sigmarsson O. (2021) . Survival of the my´rdalsjo¨ kull ice cap through the holocene thermal maximum: evidence from sulphur contents in katla tephra layers (iceland) from the last 8400 years. ANNALSOFGLA (Annals of Glaciology) . vol.47, p.183-188, DOI

• Sigmarsson O. , Moune S. , Gauthier P.J. (2020) . Fractional degassing of s, cl and f from basalt magma in the barðarbunga rift zone, iceland. BULLVOLC (Bulletin of Volcanology) . vol.82, p.54, DOI
• Terray L. , Gauthier P.J. , Breton V., Giammanco S., Sigmarsson O. , Salerno G., Caltabiano T., Falvard A. (2020) . Radon activity in volcanic gases of mt. etna by passive dosimetry. JGR (Journal of Geophysical Research - Solid Earth) . vol.125, p.e2019JB019149, DOI

• Oladottir B., Sigmarsson O. , Larsen G. (2018) . Tephra productivity and eruption flux of the subglacial katla volcano, iceland. BULLVOLC (Bulletin of Volcanology) . vol.80, p.58, DOI
• Gomez-Ulla A. , Sigmarsson O. , Huertas M.J., Devidal J.L. , Ancochea E. (2018) . The historical basanite alkali basalt tholeiite suite at lanzarote, canary islands: carbonated melts of heterogeneous mantle source?. CHEMGEO (Chemical Geology) . vol.494, p.56-68, DOI

• Carley T.L., Miller C.F., Sigmarsson O. , Coble M.A., Fisher C.M., Hanchar J.M., Schmitt A.K., Economos R.C. (2017) . Detrital zircon resolve longevity and evolution of silicic magmatism in extinct volcanic centers: a case study from the east fjords of iceland. GEOSPHERE (Geosphere) . vol.13, DOI
• Haddadi B. , Sigmarsson O. , Larse G. (2017) . Magma storage beneath grimsvötn volcano, iceland, constrained by clinopyroxene melt thermobarometry and volatiles in melt inclusions and groundmass glass. JGR (Journal of Geophysical Research - Solid Earth) . vol.122, DOI
• Gomez-Ulla A. , Sigmarsson O. , Gudfinnsson G.H. (2017) . Trace element systematics of olivine from historical eruptions of lanzarote, canary islands: constraints on mantle source and melting mode. CHEMGEO (Chemical Geology) . DOI

• Gudmundsson, M., Jónsdóttir K., Hooper A., Holohan E.P., Halldórsson S.A., Ófeigsson B.G., Cesca, S., Vogfjörd K.S., Sigmundsson F., Högnadóttir T., Einarsson P., Sigmarsson O. , Jarosch A.H., Jónasson K., Magnússon E., Hreinsdóttir S., Bagnardi M., Parks M.M., Hjörleifsdóttir V., Pálsson F., Walter T.R., Gudfinnsson G.H., Dahm T., Roberts M.J., Hensch M., Belart J.M.C., Spaans K., Jakobsson S., Gudmundsson G.B., Fridriksdóttir H.M., Drouin V., Dürig T., Aðalgeirsdóttir G., Riishuus M.S., Pedersen G.B.M., Van Boeckel T., Oddsson B., Pfeffer M.A., Barsotti S., Bergsson B., Donovan A., Burton M.R., Aiuppa A. (2016) . Gradual caldera collapse at bardarbunga volcano, iceland, regulated by lateral magma outflow. SCIENCES (Science) . vol.353, DOI
• Gauthier P.J. , Sigmarsson O. , Gouhier M. , Haddadi B. , Moune S. (2016) . Elevated gas flux and trace metal degassing from the 2014–2015 fissure eruption at the barðarbunga volcanic system, iceland. JGR (Journal of Geophysical Research - Solid Earth) . vol.121, p.1610–1630, DOI
• Carpentier M. , Gannoun A.M. , Pin C. , Sigmarsson O. (2016) . New thorium isotope ratio measurements in silicate reference materials: a tho, agv 2, bcr 2, be n, bhvo 2 and bir 1. GEOSTAND (Geostandards and Geoanalytical Research) . vol.40, p.239-256, DOI

• Sigmarsson O. , Halldorsson S. A (2015) . Delimiting baroarbunga and askja volcanic systems with sr and nd isotope ratios. JOKULL (Jökull) . vol.65, p.17-28,
• Gíslason S.R,, Stefánsdóttir G,, Pfeffer M.A., Barsotti S., Jóhannsson Th,, Galeczka I., Bali E., Sigmarsson O. , Stefánsson A., Keller N.S., Sigurdsson Á., Bergsson B., Galle B., Jacobo V.C., Arellano S., Aiuppa A., Jónasdóttir E.B., Eiríksdóttir E.S., Jakobsson S., Guðfinnsson G.H., Halldórsson S.A., Gunnarsson H., Haddadi B. , Jónsdóttir I., Thordarson Th., Riishuus M., Högnadóttir Th., Dürig T., Pedersen G.D.M., Höskuldsson Á., Gudmundsson M.T. (2015) . Environmental pressure from the 2014–15 eruption of barðarbunga volcano, iceland. GEOCHPERPL (Geochemical Perspectives Letters) . vol.1, p.84-93, DOI
• Sigmarsson O. , Condomines M., Gauthier P.J. (2015) . Excess 210po in 2010 eyjafjallajökull tephra (iceland): evidence for pre eruptive gas accumulation. EPSL (Earth and Planetary Science Letters) . vol.427, p.66-73, DOI

• Oladottir B.A., Larsen G., Sigmarsson O. (2014) . Volume estimates of nine katla tephra layers (similar to 1860 bc 870 ad). JOKULL (Jökull) . vol.63, p.23-40,

• Oladottir B., Larsen G., Sigmarsson O. (2013) . Skyggnst i fortið grimsvatna, barðarbungu og kverkfjalla. natturufræðingurinn, 2013. 83(3 4): p. 112−125..
• Sigmarsson O. , Laporte D. , Carpentier M., Devouard B. , Devidal J.L. , Marti J. (2013) . Formation of u depleted rhyolite from a basanite at el hierro, canary islands: contributions to mineralogy and petrology, v. 165, p. 601 622,. DOI
• Sigmarsson O. , Haddadi B. , Carn S., Moune S. , Gudnason J., Yang K., Clarisse L. (2013) . The sulfur budget of the 2011 grimsvötn eruption,iceland: geophysical research letters, v. 40, p. 1 6,. DOI

• Oladottir B., Larsen G., Sigmarsson O. (2012) . Deciphering eruption history and magmatic processes from tephra in iceland. JOKULL (Jökull) . vol.62, p.1-20,
• Moune S. , Sigmarsson O. , Schiano P. , Thordarson T., Keiding J.K. (2012) . Melt inclusion constraints on the magma source of eyjafjallajökull 2010 flank eruption. JGR (Journal of Geophysical Research - Solid Earth) . vol.117, p.B00C07, DOI
• Jakob K., Sigmarsson O. (2012) . Geothermobarometry of the 2010 eyjafjallajökull eruption: new constraints on icelandic magma plumbing systems. journal of geophysical research 117, bc00c09,. DOI
• Bindeman I., Gurenko A., Carley T., Miller C., Martin E., Sigmarsson O. (2012) . Silicic magma petrogenesis in iceland by remelting of hydrothermally altered crust based on oxygen isotope diversity and disequilibria between zircon and magma with implications for morb. terra nova 2.

• Sigmarsson O. (2011) . Hvitserkur: fjall sem myndaðist i setskal: glettingur, v. 55 56, p. 20 23..
• Sigmarsson O. (2011) . Hvitserkur: fjall sem myndaðist i setskal. glettingur, 55 56(21): p. 20 23..
• Sigmarsson O. , Vlastélic I. , Andreasen R., Bindeman I., Devidal J.L. , Moune S. , Keiding J.K., Larsen G., Höskuldsson A., Thordarson T. (2011) . Remobilization of silicic intrusion by mafic magmas during the 2010 eyjafjallajökull eruption: solid earth, v. 2, p. 271 281.. SOLIDEARTH (Solid Earth) . vol.2, p.271-281,
• Oladottir B., Sigmarsson O. , Larsen G., Devidal J.L. (2011) . Provenance of basaltic tephra from vatnajökull subglacial volcanoes, iceland, as determined by major and trace element analyses: the holocene, v. 21, p. 1037 1048,. DOI
• Oladottir B., Larsen G., Sigmarsson O. (2011) . Holocene volcanic activity at grimsvötn, bardarbunga and kverkfjöll subglacial centres beneath vatnajökull, iceland: bulletin of volcanology, v. 73, p. 1187 1208,. DOI
• Martin E., Paquette J.L. , Bosse V. , Ruffet G., Tiepolo M., Sigmarsson O. (2011) . Geodynamics of rift–plume interaction in iceland as constrained by new 40ar/39ar and in situ u–pb zircon ages: earth and planetary science letters, v. 311, p. 28 38,. DOI

• Martin E., Martin H. , Sigmarsson O. (2010) . Comment on “continental geochemical signatures in dacites from iceland and implications for models of early archaean crust formation” by willbold, m., hegner, e. stracke a., rocholl a. earth and plana. DOI
• Condomines M., Sigmarsson O. , Gauthier P.J. (2010) . A simple model of ^222 rn accumulation leading to 210pb excesses in volcanic rocks. earth and planetary science letters 293, 331 338,. DOI

Congrès :

• Sigmarsson O. , Gannoun A.M. , Hervé-Carpentier G. , Bosq C. , Auclair D. , Marshall E., Halldorsson S. (2023) . Thorium, sr and nd isotope ratios in basalts from the 2021 2022 fagradalshraun, iceland. DOI

• Gomez-Ulla A. , Edmonds M., Sigmarsson O. (2019) . Elevated co2 concentrations and volatile trace element ratios suggest carbon rich fluid flux melting under lanzarote, canary islands.
• Sigmarsson O. (2019) . Depth of magma differentiation before the holuhraun eruption, bardarbunga (iceland), constraint by trace element systematics.
• Laporte D. , Sigmarsson O. , Haddadi B. , Mathieu A. , Pointud F. (2019) . Clinopyroxene melt experiments of holuhraun basalt, iceland: implications for magma storage and transport in the crust.
• Bachèlery P. , Berthod C. , Gurioli L. , Di Muro A., Gauthier P.J. , Sigmarsson O. , Médard E. , Rose-Koga E. , Besson P., Chauvel C., Burckel P., Nowak S., Caron B., Devidal J.L. , Benbakkar M. , Hidalgo S., Boudon G., Le Friant A., Komorowski J.C., Deplus C., Feuillet N., Jorry S., Fouquet Y., Thinon I. (2019) . Petrological and geochemical characterization of the lava from the 2018 2019 mayotte eruption, and comparison with the volcanic ridge extending from petite terre to about 3500m of water depth: first r.
• Gauthier P.J. , Moune S. , Sigmarsson O. (2019) . Fractional magma degassing at holuhraun, bardabunga volcanic system, iceland ?.
• Flaherty T. , Druitt T. , Sigmarsson O. , Schiano P. , Francalanci L. (2019) . Basaltic magmas of santorini from past to present.

• Flaherty T. , Druitt T. , Sigmarsson O. , Schiano P. , Francalanci L. (2018) . Basaltic magmas of santorini from past to present.
• Laporte D. , Haddadi B. , Sigmarsson O. , Mathieu A. , Pointud F. (2018) . Behaviour of clinopyroxene phenocrysts during transport and storage of basaltic magmas: experimental study and implications for clinopyroxene barometry.

• Gomez-Ulla A. , Sigmarsson O. , Guðfinnsson G.H. (2017) . Melting mode and source lithology inferred from trace element systematic in historical olivine from lanzarote, canary islands.
• Gudmundsson M.T., Hooper A., Sigmundsson F., Sigmarsson O. , HalldórssonS.A., Jónsdóttir K., Vogfjörd K.S., Holohan E.P., the Bárdarbunga Team (2017) . The bardarbunga 2014 2015 caldera collapse and its implications for evolution of central volcanoes.
• Haddadi B. , Sigmarsson O. , Larsen G. (2017) . Magma storage before large and small explosive eruption at grimsvötn volcano, iceland, constrained by thermobarometry and volatiles in melt inclusions.
• Sigmarsson O. (2017) . Volcanic systems of iceland and their magma source.
• Moune S. , Sigmarsson O. , Gauthier P.J. , Ilynskaya E. (2017) . Fractional degassing at holuhraun, iceland.

• Haddadi B. , Sigmarsson O. , Larsen G. (2016) . Plinian vs. phreatomagmatic eruptions at grimsvötn volcano, iceland.
• Sigmarsson O. , Carpentier M. , Larsen G., Guðmundsson M. (2016) . Magma fluxes and storage beneath grimsvötn volcano, iceland, estimated from ice kept historical tephra.

• Ilyinskaya E., Edmonds M., Mather T., Schmidt A., Hartley M., Oppenheimer C., Pope F., Donovan A., Sigmarsson O. , Maclennan J., Shorttle O., Francis P., Bergsson B., Barsotti S., Thordarson T., Bali E., Keller N., Stefansson A. (2015) . The source and longevity of sulfur in an icelandic flood basalt eruption plume.
• Bali E., Sigmarsson O. , Jakobsson S., Gunnarsson H. (2015) . Volatile budget of the nornahraun eruption of the barðarbunga system, iceland.
• Sigmarsson O. (2015) . Shallow lateral magma migration or not during the barðarbunga 2014 activity and preceding the flæðahraun eruption: the geochemical perspective.
• Gomez-Ulla A. , Sigmarsson O. , Huertas M.J., Ancochea E. (2015) . Melt inclusion study of the most recent basanites from el hierro and lanzarote, canary islands.
• Sigmarsson O. , Haddadi B. (2015) . Grimsvötn 2011 og stærð grimsvatnagosa.
• Haddadi B. , Sigmarsson O. , Devidal J.L. (2015) . Determining intensive parameters through clinopyroxene liquid equilibrium in grimsvötn 2011 and barðarbunga 2014 basalts. vol.17, p.EGU2015-5791-2,
• Haddadi B. , Moune S. , Sigmarsson O. , Gauthier P.J. , Gouhier M. (2015) . Pre eruptive volatile and erupted gas phase characterization of the 2014 basalt of barðarbunga volcanic system, iceland. vol.17, p.EGU2015-9572,
• Gouhier M. , Gauthier P.J. , Haddadi B. , Moune S. , Sigmarsson O. (2015) . Retrieval of lava and so2 fluxes during long lived effusive eruptions using msg seviri: the case of bardarbunga 2014 activity. vol.17, p.EGU2015-9955,
• Gauthier P.J. , Sigmarsson O. , Moune S. , Haddadi B. , Gouhier M. (2015) . Trace element degassing patterns and volcanic fluxes to the atmosphere during the 2014 holuhraun eruption, iceland. vol.17, p.EGU2015-10206-2,

• Carpentier M. , Sigmarsson O. , Larsen G. (2014) . Implications for future activity of grimsvötn volcano, iceland, from compositional time series of historical tephra.
• Haddadi B. , Jordan S. , Sanchez L. , Gurioli L. , Harris A. , Laporte D. , Le Pennec J.L. , Menand T. , Roche O. , Sigmarsson O. (2014) . Eruptions exceptionnelles : le volcanisme basaltique explosif. manifestation scientifique de restitution du cper 2007 2014, conseil régional d’auvergne, 08 09 décembre 2014 (poster)..
• Sigmarsson O. , Gauthier P.J. , Condomines M. (2014) . Duration of gas accumulation before the 2010 eyjafjallajökull eruption constrained by 210po 210pb 226ra disequilibria. geophysical research abstracts, egu2014 7987..
• Oladottir B., Larsen G., Sigmarsson O. (2014) . Volume estimates of selected prehistoric basaltic tephra layers from katla, iceland.
• Haddadi B. , Carn S., Sigmarsson O. (2014) . Sulphide globules and their impact on sulphur degassing budget: the case of grimsvötn volcano, iceland. geophysical research abstracts, egu2014 1652..

• Sigmarsson O. , Haddadi B. (2013) . Grimsvötn 2011 og stærð grimsvatnagosa. in jfi spring meeting, 2013 (communication orale)..
• Sigmarsson O. (2013) . Birth of silicic magmas at eyjafjallajökull volcano,iceland. in invited talk at geological soceiity of america annual meeting, denver, colorado, oct..

• Sigmarsson O. , Moune S. , Schiano P. (2012) . The mantle source of eyjafjallajökull magma. nordic winter meeting, reykjavik, 2012..
• Sigmarsson O. , Höskuldsson Á., Thordarson T., Larsen G. (2012) . What caused the grimsvötn 2011 eruption to penetrate into the stratosphere? nordic winter meeting, reykjavik, 2012..
• Sigmarsson O. , Gauthier P.J. , Condomines M. (2012) . Constraints from short lived u series nuclides on the magma dynamics leading to the 2010 eyjafjallajökull eruption. nordic winter meeting, reykjavik, 2012..
• Sigmarsson O. , Laporte D. , Marti J., Devouard B. , Cluzel N. (2012) . Mafic intrusion remobilising silicic magma under el hierro, canary islands. geophysical research abstracts, vol. 14, egu2012 12251. egu general assembly, vienna (austria), 22 27 april 2012..
• Sigmarsson O. (2012) . Mafic intrusions triggering eruptions in iceland. egu general assembly, vienna (austria), 22 27 april 2012 (invited talk)..

• Sigmarsson O. (2011) . Eldfell og eyjafjallajökull: hraði kvikuþróunnar undir misþroskuðum alkaliskum eldfjöllum: jfi spring meeting, 2011..
• Thordarson T., Hayward C., Moune S. , Hartley M., Sigmarsson O. , Höskuldsson A., Guðmundsson M.T., Sigmundsson F. (2011) . The 20 march 12 april 2010 fimmvörðuhals eruption, eyjafjallajöull volcano, iceland: volatile contents and magma degassing: egu 2011, vienna..
• Sigmarsson O. , Condomines M. (2011) . Time scales of magma mingling during the 2010 eruption of eyjafjallajökull, iceland: geophysical research abstracts, vol. 13, egu2011 12622, egu general assembly 2011..
• Sigmarsson O. (2011) . The dynamic magma mixing during the 2010 eruption of eyjafjallajökull, iceland: geophysical research abstracts, vol. 13, egu2011 12589, egu general assembly 2011..
• Oladóttir B.A., Larsen G., Sigmarsson O. (2011) . The neighbours of the eyjafjallajökull volcano: katla, grimsvötn and barðarbunga: geophysical research abstracts vol. 13, egu2011 3522, egu general assembly 2011..
• Moune S. , Sigmarsson O. , Schiano P. , Thordarson T. (2011) . Volatile characterisations of eyjafjallajokull volcano (iceland): from the magmatic source at depth to the surface: geophysical research abstracts vol. 13, egu2011 4184, egu general assembly 2011..
• Keiding J.K., Sigmarsson O. (2011) . Geothermobarometry of the 2010 eyjafjallajökull eruption: geophysical research abstracts vol. 13, egu2011 9855, egu general assembly 2011..