Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ?
International audience How the solubility of volatile elements varies with magma composition, pressure and temperature controls theiroutgassing at active volcanoes. In general, the relative solubility of major volatile species in basalt increases fromCO2, H2O, S, Cl to F. The first three species are...
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ftinsu:oai:HAL:hal-02404323v1 2023-06-18T03:41:26+02:00 Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ? Gauthier, Pierre-J Moune, Séverine Sigmarsson, Olgeir Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS) Vienne, Austria 2019-04-07 https://uca.hal.science/hal-02404323 en eng HAL CCSD hal-02404323 https://uca.hal.science/hal-02404323 EGU General Assembly https://uca.hal.science/hal-02404323 EGU General Assembly, Apr 2019, Vienne, Austria [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/conferenceObject Conference poster 2019 ftinsu 2023-06-05T23:24:10Z International audience How the solubility of volatile elements varies with magma composition, pressure and temperature controls theiroutgassing at active volcanoes. In general, the relative solubility of major volatile species in basalt increases fromCO2, H2O, S, Cl to F. The first three species are known to form a gas phase both before and during volcaniceruptions, whereas the last two principally outgas during and after an eruption. Filter-pack gas samples collectedfrom the main crater of the Holuhraun eruption (29 August 2014 to 27 February 2015) a few days after theeruption ended have been compared with those of the main eruptive plume, confirming the degassing order of themajor gaseous elements. The eruption was characterized by high lava discharge rate and significant gas emissionwith approximately 10 Tg, SO2. Primary magmatic degassing had elevated S/Cl, infinitive S/F due to almostnegligible F degassing and high trace metal fluxes to the atmosphere (Gauthier et al., 2016; Gislason et al., 2015)causing a significant environmental impact (Ilyinskaya et al., 2017; Stefansson et al., 2017). Nevertheless, snowprecipitated around the lava field and collected during the eruption had significant F concentrations despite itsvery low abundance in the main gas plume.The post-eruptive diluted gas emissions of Holuhraun is characterized by concentrations of major gases withSO2, HCl and HF ranging from 98-327, 55-107, 28-49, respectively (mg/m3), with much lower S/Cl (1.4 0.4),Cl/F (2.0 0.2) and hence elevated F/S (0.4 0.1) compared to the syn-eruptive gas (46 8, 11 5, 0,respectively). Low S/Cl mass ratios (0.9-1.6) correspond to a factor of four decrease in S degassing and a factorof seven increase in Cl degassing compared to the primary magmatic degassing. High F/Cl suggests that 50 timesmore F is released during the secondary degassing event. Outgassing of the lave field thus explains the elevated Fin the environmental samples such as the snow and rivers flowing to the lowland. The lava composition ... Conference Object Iceland Institut national des sciences de l'Univers: HAL-INSU Gauthier ENVELOPE(-63.583,-63.583,-64.833,-64.833) Holuhraun ENVELOPE(-16.831,-16.831,64.852,64.852) Main Crater ENVELOPE(167.167,167.167,-77.533,-77.533) Stefansson ENVELOPE(-62.417,-62.417,-69.467,-69.467) |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Gauthier, Pierre-J Moune, Séverine Sigmarsson, Olgeir Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ? |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience How the solubility of volatile elements varies with magma composition, pressure and temperature controls theiroutgassing at active volcanoes. In general, the relative solubility of major volatile species in basalt increases fromCO2, H2O, S, Cl to F. The first three species are known to form a gas phase both before and during volcaniceruptions, whereas the last two principally outgas during and after an eruption. Filter-pack gas samples collectedfrom the main crater of the Holuhraun eruption (29 August 2014 to 27 February 2015) a few days after theeruption ended have been compared with those of the main eruptive plume, confirming the degassing order of themajor gaseous elements. The eruption was characterized by high lava discharge rate and significant gas emissionwith approximately 10 Tg, SO2. Primary magmatic degassing had elevated S/Cl, infinitive S/F due to almostnegligible F degassing and high trace metal fluxes to the atmosphere (Gauthier et al., 2016; Gislason et al., 2015)causing a significant environmental impact (Ilyinskaya et al., 2017; Stefansson et al., 2017). Nevertheless, snowprecipitated around the lava field and collected during the eruption had significant F concentrations despite itsvery low abundance in the main gas plume.The post-eruptive diluted gas emissions of Holuhraun is characterized by concentrations of major gases withSO2, HCl and HF ranging from 98-327, 55-107, 28-49, respectively (mg/m3), with much lower S/Cl (1.4 0.4),Cl/F (2.0 0.2) and hence elevated F/S (0.4 0.1) compared to the syn-eruptive gas (46 8, 11 5, 0,respectively). Low S/Cl mass ratios (0.9-1.6) correspond to a factor of four decrease in S degassing and a factorof seven increase in Cl degassing compared to the primary magmatic degassing. High F/Cl suggests that 50 timesmore F is released during the secondary degassing event. Outgassing of the lave field thus explains the elevated Fin the environmental samples such as the snow and rivers flowing to the lowland. The lava composition ... |
author2 |
Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Gauthier, Pierre-J Moune, Séverine Sigmarsson, Olgeir |
author_facet |
Gauthier, Pierre-J Moune, Séverine Sigmarsson, Olgeir |
author_sort |
Gauthier, Pierre-J |
title |
Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ? |
title_short |
Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ? |
title_full |
Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ? |
title_fullStr |
Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ? |
title_full_unstemmed |
Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ? |
title_sort |
fractional magma degassing at holuhraun, bardabunga volcanic system, iceland ? |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://uca.hal.science/hal-02404323 |
op_coverage |
Vienne, Austria |
long_lat |
ENVELOPE(-63.583,-63.583,-64.833,-64.833) ENVELOPE(-16.831,-16.831,64.852,64.852) ENVELOPE(167.167,167.167,-77.533,-77.533) ENVELOPE(-62.417,-62.417,-69.467,-69.467) |
geographic |
Gauthier Holuhraun Main Crater Stefansson |
geographic_facet |
Gauthier Holuhraun Main Crater Stefansson |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
EGU General Assembly https://uca.hal.science/hal-02404323 EGU General Assembly, Apr 2019, Vienne, Austria |
op_relation |
hal-02404323 https://uca.hal.science/hal-02404323 |
_version_ |
1769007013910544384 |