Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption
International audience Injection of basaltic magmas into silicic crustal holding chambers and subsequent magma mingling or mixing is a process that has been recognised since the late seventies as resulting in explosive eruptions. Detailed reconstruction and assessment of the mixing process caused by...
Published in: | Solid Earth |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://insu.hal.science/insu-02949513 https://insu.hal.science/insu-02949513/document https://insu.hal.science/insu-02949513/file/se-2-271-2011.pdf https://doi.org/10.5194/se-2-271-2011 |
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Université Jean Monnet – Saint-Etienne: HAL |
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English |
topic |
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology |
spellingShingle |
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology Sigmarsson, Olgeir Vlastélic, Ivan Andreasen, R. Bindeman, I. Devidal, Jean-Luc Moune, Séverine Keiding, J.K. Larsen, G. Höskuldsson, A. Thordarson, T. Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption |
topic_facet |
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology |
description |
International audience Injection of basaltic magmas into silicic crustal holding chambers and subsequent magma mingling or mixing is a process that has been recognised since the late seventies as resulting in explosive eruptions. Detailed reconstruction and assessment of the mixing process caused by such intrusion is now possible because of the exceptional time-sequence sample suite available from the tephra fallout of the 2010 summit eruption at Eyjafjallajökull volcano in South Iceland. Fallout from 14 to 19 April contains three glass types of basaltic, intermediate, and silicic compositions recording rapid magma mingling without homogenisation, involving evolved FeTi-basalt and silicic melt with composition identical to that produced by the 1821–1823 AD Eyjafjallajökull summit eruption. The time-dependent change in the magma composition suggests a binary mixing process with changing end-member compositions and proportions. Beginning of May, a new injection of primitive basalt was recorded by deep seismicity, appearance of Mg-rich olivine phenocrysts together with high sulphur dioxide output and presence of sulphide crystals. Thus, the composition of the basaltic injection became more magnesian and hotter with time provoking changes in the silicic mixing end-member from pre-existing melt to the solid carapace of the magma chamber. Finally, decreasing proportions of the mafic end-member with time in the erupted mixed-magma demonstrate that injections of Mg-rich basalt was the motor of the 2010 Eyjafjallajökull explosive eruption, and that its decreasing inflow terminated the eruption. Significant quantity of silicic magma is thus still present in the interior of the volcano. Our results show that detailed sampling during the entire eruption was essential for deciphering the complex magmatic processes at play, i.e. the dynamics of the magma mingling and mixing. Finally, the rapid compositional changes in the eruptive products suggest that magma mingling occurs on a timescale of a few hours to days whereas the ... |
author2 |
Laboratoire Magmas et Volcans (LMV) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-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) University of Iceland Reykjavik Imperial College London University of Oregon Eugene German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) University of Edinburgh (Edin.) |
format |
Article in Journal/Newspaper |
author |
Sigmarsson, Olgeir Vlastélic, Ivan Andreasen, R. Bindeman, I. Devidal, Jean-Luc Moune, Séverine Keiding, J.K. Larsen, G. Höskuldsson, A. Thordarson, T. |
author_facet |
Sigmarsson, Olgeir Vlastélic, Ivan Andreasen, R. Bindeman, I. Devidal, Jean-Luc Moune, Séverine Keiding, J.K. Larsen, G. Höskuldsson, A. Thordarson, T. |
author_sort |
Sigmarsson, Olgeir |
title |
Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption |
title_short |
Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption |
title_full |
Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption |
title_fullStr |
Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption |
title_full_unstemmed |
Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption |
title_sort |
remobilization of silicic intrusion by mafic magmas during the 2010 eyjafjallajökull eruption |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://insu.hal.science/insu-02949513 https://insu.hal.science/insu-02949513/document https://insu.hal.science/insu-02949513/file/se-2-271-2011.pdf https://doi.org/10.5194/se-2-271-2011 |
genre |
Eyjafjallajökull Iceland |
genre_facet |
Eyjafjallajökull Iceland |
op_source |
ISSN: 1869-9510 EISSN: 1869-9529 Solid Earth https://insu.hal.science/insu-02949513 Solid Earth, 2011, 2 (2), pp.271-281. ⟨10.5194/se-2-271-2011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/se-2-271-2011 insu-02949513 https://insu.hal.science/insu-02949513 https://insu.hal.science/insu-02949513/document https://insu.hal.science/insu-02949513/file/se-2-271-2011.pdf doi:10.5194/se-2-271-2011 |
op_rights |
http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/se-2-271-2011 |
container_title |
Solid Earth |
container_volume |
2 |
container_issue |
2 |
container_start_page |
271 |
op_container_end_page |
281 |
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1802643949137952768 |
spelling |
ftunivstetienne:oai:HAL:insu-02949513v1 2024-06-23T07:52:36+00:00 Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption Sigmarsson, Olgeir Vlastélic, Ivan Andreasen, R. Bindeman, I. Devidal, Jean-Luc Moune, Séverine Keiding, J.K. Larsen, G. Höskuldsson, A. Thordarson, T. Laboratoire Magmas et Volcans (LMV) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-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) University of Iceland Reykjavik Imperial College London University of Oregon Eugene German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ) University of Edinburgh (Edin.) 2011 https://insu.hal.science/insu-02949513 https://insu.hal.science/insu-02949513/document https://insu.hal.science/insu-02949513/file/se-2-271-2011.pdf https://doi.org/10.5194/se-2-271-2011 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/se-2-271-2011 insu-02949513 https://insu.hal.science/insu-02949513 https://insu.hal.science/insu-02949513/document https://insu.hal.science/insu-02949513/file/se-2-271-2011.pdf doi:10.5194/se-2-271-2011 http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess ISSN: 1869-9510 EISSN: 1869-9529 Solid Earth https://insu.hal.science/insu-02949513 Solid Earth, 2011, 2 (2), pp.271-281. ⟨10.5194/se-2-271-2011⟩ [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology info:eu-repo/semantics/article Journal articles 2011 ftunivstetienne https://doi.org/10.5194/se-2-271-2011 2024-06-11T00:01:19Z International audience Injection of basaltic magmas into silicic crustal holding chambers and subsequent magma mingling or mixing is a process that has been recognised since the late seventies as resulting in explosive eruptions. Detailed reconstruction and assessment of the mixing process caused by such intrusion is now possible because of the exceptional time-sequence sample suite available from the tephra fallout of the 2010 summit eruption at Eyjafjallajökull volcano in South Iceland. Fallout from 14 to 19 April contains three glass types of basaltic, intermediate, and silicic compositions recording rapid magma mingling without homogenisation, involving evolved FeTi-basalt and silicic melt with composition identical to that produced by the 1821–1823 AD Eyjafjallajökull summit eruption. The time-dependent change in the magma composition suggests a binary mixing process with changing end-member compositions and proportions. Beginning of May, a new injection of primitive basalt was recorded by deep seismicity, appearance of Mg-rich olivine phenocrysts together with high sulphur dioxide output and presence of sulphide crystals. Thus, the composition of the basaltic injection became more magnesian and hotter with time provoking changes in the silicic mixing end-member from pre-existing melt to the solid carapace of the magma chamber. Finally, decreasing proportions of the mafic end-member with time in the erupted mixed-magma demonstrate that injections of Mg-rich basalt was the motor of the 2010 Eyjafjallajökull explosive eruption, and that its decreasing inflow terminated the eruption. Significant quantity of silicic magma is thus still present in the interior of the volcano. Our results show that detailed sampling during the entire eruption was essential for deciphering the complex magmatic processes at play, i.e. the dynamics of the magma mingling and mixing. Finally, the rapid compositional changes in the eruptive products suggest that magma mingling occurs on a timescale of a few hours to days whereas the ... Article in Journal/Newspaper Eyjafjallajökull Iceland Université Jean Monnet – Saint-Etienne: HAL Solid Earth 2 2 271 281 |