Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica
International audience Continental intraplate volcanoes, such as Erebus volcano, Antarctica, are associated with extensional tectonics, mantle upwelling and high heat flow. Typically, erupted magmas are alkaline and rich in volatiles (especially CO2), inherited from low degrees of partial melting of...
Published in: | Earth and Planetary Science Letters |
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ftunitours:oai:HAL:insu-00707142v1 2023-06-11T04:07:07+02:00 Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica Oppenheimer, Clive Moretti, Roberto Kyle, Philip R. Eschenbacher, Al Lowenstern, Jacob B. Hervig, Richard L. Dunbar, Nelia W. University of Cambridge UK (CAM) Institut des Sciences de la Terre d'Orléans (ISTO) Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS) Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Napoli (INGV) Istituto Nazionale di Geofisica e Vulcanologia Centro Interdipartimentale di Ricerca in Ingegneria Ambientale (CIRIAM) Seconda Università degli Studi di Napoli = Second University of Naples New Mexico Institute of Mining and Technology New Mexico Tech (NMT) Volcano Hazards Team United States Geological Survey Reston (USGS) ASU School of Earth and Space Exploration (SESE) Arizona State University Tempe (ASU) ANT-0538414 and ANT-0838817 from the Office of Polar Programs (National Science Foundation) 2011 https://hal-insu.archives-ouvertes.fr/insu-00707142 https://hal-insu.archives-ouvertes.fr/insu-00707142/document https://hal-insu.archives-ouvertes.fr/insu-00707142/file/Oppenheimer-EPSL-2011.pdf https://doi.org/10.1016/j.epsl.2011.04.005 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.04.005 insu-00707142 https://hal-insu.archives-ouvertes.fr/insu-00707142 https://hal-insu.archives-ouvertes.fr/insu-00707142/document https://hal-insu.archives-ouvertes.fr/insu-00707142/file/Oppenheimer-EPSL-2011.pdf doi:10.1016/j.epsl.2011.04.005 info:eu-repo/semantics/OpenAccess ISSN: 0012-821X Earth and Planetary Science Letters https://hal-insu.archives-ouvertes.fr/insu-00707142 Earth and Planetary Science Letters, 2011, 306 (3-4), pp.261-271. ⟨10.1016/j.epsl.2011.04.005⟩ CO2 fluxing degassing Strombolian eruptions lava lake melt inclusions redox [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2011 ftunitours https://doi.org/10.1016/j.epsl.2011.04.005 2023-05-02T22:39:52Z International audience Continental intraplate volcanoes, such as Erebus volcano, Antarctica, are associated with extensional tectonics, mantle upwelling and high heat flow. Typically, erupted magmas are alkaline and rich in volatiles (especially CO2), inherited from low degrees of partial melting of mantle sources. We examine the degassing of the magmatic system at Erebus volcano using melt inclusion data and high temporal resolution open-path Fourier transform infrared (FTIR) spectroscopic measurements of gas emissions from the active lava lake. Remarkably different gas signatures are associated with passive and explosive gas emissions, representative of volatile contents and redox conditions that reveal contrasting shallow and deep degassing sources. We show that this unexpected degassing signature provides a unique probe for magma differentiation and transfer of CO2-rich oxidised fluids from the mantle to the surface, and evaluate how these processes operate in time and space. Extensive crystallisation driven by CO2 fluxing is responsible for isobaric fractionation of parental basanite magmas close to their source depth. Magma deeper than 4 kbar equilibrates under vapour-buffered conditions. At shallower depths, CO2-rich fluids accumulate and are then released either via convection-driven, open-system gas loss or as closed-system slugs that ascend and result in Strombolian eruptions in the lava lake. The open-system gases have a reduced state (below the QFM buffer) whereas the closed-system gases preserve their deep oxidised signatures (close to the NNO buffer). Article in Journal/Newspaper Antarc* Antarctica Université François-Rabelais de Tours: HAL Lava Lake ENVELOPE(-128.996,-128.996,55.046,55.046) Earth and Planetary Science Letters 306 3-4 261 271 |
institution |
Open Polar |
collection |
Université François-Rabelais de Tours: HAL |
op_collection_id |
ftunitours |
language |
English |
topic |
CO2 fluxing degassing Strombolian eruptions lava lake melt inclusions redox [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
CO2 fluxing degassing Strombolian eruptions lava lake melt inclusions redox [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes Oppenheimer, Clive Moretti, Roberto Kyle, Philip R. Eschenbacher, Al Lowenstern, Jacob B. Hervig, Richard L. Dunbar, Nelia W. Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica |
topic_facet |
CO2 fluxing degassing Strombolian eruptions lava lake melt inclusions redox [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Continental intraplate volcanoes, such as Erebus volcano, Antarctica, are associated with extensional tectonics, mantle upwelling and high heat flow. Typically, erupted magmas are alkaline and rich in volatiles (especially CO2), inherited from low degrees of partial melting of mantle sources. We examine the degassing of the magmatic system at Erebus volcano using melt inclusion data and high temporal resolution open-path Fourier transform infrared (FTIR) spectroscopic measurements of gas emissions from the active lava lake. Remarkably different gas signatures are associated with passive and explosive gas emissions, representative of volatile contents and redox conditions that reveal contrasting shallow and deep degassing sources. We show that this unexpected degassing signature provides a unique probe for magma differentiation and transfer of CO2-rich oxidised fluids from the mantle to the surface, and evaluate how these processes operate in time and space. Extensive crystallisation driven by CO2 fluxing is responsible for isobaric fractionation of parental basanite magmas close to their source depth. Magma deeper than 4 kbar equilibrates under vapour-buffered conditions. At shallower depths, CO2-rich fluids accumulate and are then released either via convection-driven, open-system gas loss or as closed-system slugs that ascend and result in Strombolian eruptions in the lava lake. The open-system gases have a reduced state (below the QFM buffer) whereas the closed-system gases preserve their deep oxidised signatures (close to the NNO buffer). |
author2 |
University of Cambridge UK (CAM) Institut des Sciences de la Terre d'Orléans (ISTO) Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS) Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Napoli (INGV) Istituto Nazionale di Geofisica e Vulcanologia Centro Interdipartimentale di Ricerca in Ingegneria Ambientale (CIRIAM) Seconda Università degli Studi di Napoli = Second University of Naples New Mexico Institute of Mining and Technology New Mexico Tech (NMT) Volcano Hazards Team United States Geological Survey Reston (USGS) ASU School of Earth and Space Exploration (SESE) Arizona State University Tempe (ASU) ANT-0538414 and ANT-0838817 from the Office of Polar Programs (National Science Foundation) |
format |
Article in Journal/Newspaper |
author |
Oppenheimer, Clive Moretti, Roberto Kyle, Philip R. Eschenbacher, Al Lowenstern, Jacob B. Hervig, Richard L. Dunbar, Nelia W. |
author_facet |
Oppenheimer, Clive Moretti, Roberto Kyle, Philip R. Eschenbacher, Al Lowenstern, Jacob B. Hervig, Richard L. Dunbar, Nelia W. |
author_sort |
Oppenheimer, Clive |
title |
Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica |
title_short |
Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica |
title_full |
Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica |
title_fullStr |
Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica |
title_full_unstemmed |
Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica |
title_sort |
mantle to surface degassing of alkalic magmas at erebus volcano, antarctica |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00707142 https://hal-insu.archives-ouvertes.fr/insu-00707142/document https://hal-insu.archives-ouvertes.fr/insu-00707142/file/Oppenheimer-EPSL-2011.pdf https://doi.org/10.1016/j.epsl.2011.04.005 |
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: 0012-821X Earth and Planetary Science Letters https://hal-insu.archives-ouvertes.fr/insu-00707142 Earth and Planetary Science Letters, 2011, 306 (3-4), pp.261-271. ⟨10.1016/j.epsl.2011.04.005⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.04.005 insu-00707142 https://hal-insu.archives-ouvertes.fr/insu-00707142 https://hal-insu.archives-ouvertes.fr/insu-00707142/document https://hal-insu.archives-ouvertes.fr/insu-00707142/file/Oppenheimer-EPSL-2011.pdf doi:10.1016/j.epsl.2011.04.005 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2011.04.005 |
container_title |
Earth and Planetary Science Letters |
container_volume |
306 |
container_issue |
3-4 |
container_start_page |
261 |
op_container_end_page |
271 |
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1768379751201767424 |