Backward tracking of gas chemistry measurements at Erebus volcano
International audience Erebus volcano in Antarctica offers an exceptional opportunity to probe the dynamics of degassing - its behavior is characterized by an active lava lake through which sporadic Strombolian eruptions occur. Here, we develop a framework for interpreting contrasting degassing sign...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2012
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Subjects: | |
Online Access: | https://insu.hal.science/insu-00771966 https://insu.hal.science/insu-00771966/document https://insu.hal.science/insu-00771966/file/ggge2328.pdf https://doi.org/10.1029/2012GC004243 |
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ftinsu:oai:HAL:insu-00771966v1 |
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openpolar |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Erebus volcano eruptive mechanisms thermodynamics volcanic gas [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Erebus volcano eruptive mechanisms thermodynamics volcanic gas [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes Burgisser, Alain Oppenheimer, Clive Alletti, Marina Kyle, Philip R. Scaillet, Bruno Carroll, Michael R. Backward tracking of gas chemistry measurements at Erebus volcano |
topic_facet |
Erebus volcano eruptive mechanisms thermodynamics volcanic gas [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Erebus volcano in Antarctica offers an exceptional opportunity to probe the dynamics of degassing - its behavior is characterized by an active lava lake through which sporadic Strombolian eruptions occur. Here, we develop a framework for interpreting contrasting degassing signatures measured at high temporal resolution, which integrates physical scenarios of gas/melt separation into a thermodynamic model that includes new volatile solubility data for Erebus phonolite. In this widely applicable framework, the measured gas compositions are backtracked from surface to depth according to physical templates involving various degrees of separation of gas and melt during ascent. Overall, explosive signatures can be explained by large bubbles (gas slugs) rising slowly in equilibrium from at least 20 bars but at most a few hundred bars in a magmatic column closer to the stagnant end-member than the convecting end-member. The span of explosive signatures can be due to various departure depths and/or slug acceleration below a few tens of bars. Results also reveal that explosive gases last equilibrated at temperatures up to 300 degrees C colder than the lake due to rapid gas expansion just prior to bursting. This picture (individual rise of gas and melt batches from a single, potentially very shallow phonolitic source) offers an alternative to the conclusions of previous work based on a similar data set at Erebus, according to which differences between quiescent and explosive gas signatures are due to the decompression of two deep, volatile-saturated sources that mixed to various degrees (phonolite at 1-3 kbar and basanite at 5-8 kbar). |
author2 |
Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Department of Geology University of Cambridge UK (CAM) New Mexico Institute of Mining and Technology New Mexico Tech (NMT) Departimento di Scienze della Terra Camerino Università degli Studi di Camerino = University of Camerino (UNICAM) ANT- 0838817 from the Office of Polar Programs (National Science Foundation) European Project: 202844,EC:FP7:ERC,ERC-2007-StG,DEMONS(2008) |
format |
Article in Journal/Newspaper |
author |
Burgisser, Alain Oppenheimer, Clive Alletti, Marina Kyle, Philip R. Scaillet, Bruno Carroll, Michael R. |
author_facet |
Burgisser, Alain Oppenheimer, Clive Alletti, Marina Kyle, Philip R. Scaillet, Bruno Carroll, Michael R. |
author_sort |
Burgisser, Alain |
title |
Backward tracking of gas chemistry measurements at Erebus volcano |
title_short |
Backward tracking of gas chemistry measurements at Erebus volcano |
title_full |
Backward tracking of gas chemistry measurements at Erebus volcano |
title_fullStr |
Backward tracking of gas chemistry measurements at Erebus volcano |
title_full_unstemmed |
Backward tracking of gas chemistry measurements at Erebus volcano |
title_sort |
backward tracking of gas chemistry measurements at erebus volcano |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://insu.hal.science/insu-00771966 https://insu.hal.science/insu-00771966/document https://insu.hal.science/insu-00771966/file/ggge2328.pdf https://doi.org/10.1029/2012GC004243 |
long_lat |
ENVELOPE(-128.996,-128.996,55.046,55.046) |
geographic |
Lava Lake |
geographic_facet |
Lava Lake |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://insu.hal.science/insu-00771966 Geochemistry, Geophysics, Geosystems, 2012, 13, pp.Q11010. ⟨10.1029/2012GC004243⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2012GC004243 info:eu-repo/grantAgreement/EC/FP7/202844/EU/Deciphering Eruptions by Modeling Outputs of Natural Systems/DEMONS insu-00771966 https://insu.hal.science/insu-00771966 https://insu.hal.science/insu-00771966/document https://insu.hal.science/insu-00771966/file/ggge2328.pdf doi:10.1029/2012GC004243 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2012GC004243 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
13 |
container_issue |
11 |
_version_ |
1788056708232249344 |
spelling |
ftinsu:oai:HAL:insu-00771966v1 2024-01-14T10:01:54+01:00 Backward tracking of gas chemistry measurements at Erebus volcano Burgisser, Alain Oppenheimer, Clive Alletti, Marina Kyle, Philip R. Scaillet, Bruno Carroll, Michael R. Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Department of Geology University of Cambridge UK (CAM) New Mexico Institute of Mining and Technology New Mexico Tech (NMT) Departimento di Scienze della Terra Camerino Università degli Studi di Camerino = University of Camerino (UNICAM) ANT- 0838817 from the Office of Polar Programs (National Science Foundation) European Project: 202844,EC:FP7:ERC,ERC-2007-StG,DEMONS(2008) 2012 https://insu.hal.science/insu-00771966 https://insu.hal.science/insu-00771966/document https://insu.hal.science/insu-00771966/file/ggge2328.pdf https://doi.org/10.1029/2012GC004243 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2012GC004243 info:eu-repo/grantAgreement/EC/FP7/202844/EU/Deciphering Eruptions by Modeling Outputs of Natural Systems/DEMONS insu-00771966 https://insu.hal.science/insu-00771966 https://insu.hal.science/insu-00771966/document https://insu.hal.science/insu-00771966/file/ggge2328.pdf doi:10.1029/2012GC004243 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://insu.hal.science/insu-00771966 Geochemistry, Geophysics, Geosystems, 2012, 13, pp.Q11010. ⟨10.1029/2012GC004243⟩ Erebus volcano eruptive mechanisms thermodynamics volcanic gas [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1029/2012GC004243 2023-12-20T17:22:39Z International audience Erebus volcano in Antarctica offers an exceptional opportunity to probe the dynamics of degassing - its behavior is characterized by an active lava lake through which sporadic Strombolian eruptions occur. Here, we develop a framework for interpreting contrasting degassing signatures measured at high temporal resolution, which integrates physical scenarios of gas/melt separation into a thermodynamic model that includes new volatile solubility data for Erebus phonolite. In this widely applicable framework, the measured gas compositions are backtracked from surface to depth according to physical templates involving various degrees of separation of gas and melt during ascent. Overall, explosive signatures can be explained by large bubbles (gas slugs) rising slowly in equilibrium from at least 20 bars but at most a few hundred bars in a magmatic column closer to the stagnant end-member than the convecting end-member. The span of explosive signatures can be due to various departure depths and/or slug acceleration below a few tens of bars. Results also reveal that explosive gases last equilibrated at temperatures up to 300 degrees C colder than the lake due to rapid gas expansion just prior to bursting. This picture (individual rise of gas and melt batches from a single, potentially very shallow phonolitic source) offers an alternative to the conclusions of previous work based on a similar data set at Erebus, according to which differences between quiescent and explosive gas signatures are due to the decompression of two deep, volatile-saturated sources that mixed to various degrees (phonolite at 1-3 kbar and basanite at 5-8 kbar). Article in Journal/Newspaper Antarc* Antarctica Institut national des sciences de l'Univers: HAL-INSU Lava Lake ENVELOPE(-128.996,-128.996,55.046,55.046) Geochemistry, Geophysics, Geosystems 13 11 |