Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica
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 exa...
Published in: | Earth and Planetary Science Letters |
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Online Access: | http://hdl.handle.net/2122/7831 https://doi.org/10.1016/j.epsl.2011.04.005 |
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ftingv:oai:www.earth-prints.org:2122/7831 2023-05-15T14:01:37+02:00 Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica Oppenheimer, C. Moretti, R. Kyle, P. R. Eschenbacher, A. Lowenstern, J. B. Hervig, R. L. Dunbar, N. W. Oppenheimer, C. Moretti, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia Kyle, P. R. Eschenbacher, A. Lowenstern, J. B. Hervig, R. L. Dunbar, N. W. #PLACEHOLDER_PARENT_METADATA_VALUE# Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia 2011 http://hdl.handle.net/2122/7831 https://doi.org/10.1016/j.epsl.2011.04.005 en eng Elsevier Science Limited Earth and planetary science letters /306(2011) 0012-821X 1385-013X http://hdl.handle.net/2122/7831 doi:10.1016/j.epsl.2011.04.005 restricted CO2 fluxing 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring article 2011 ftingv https://doi.org/10.1016/j.epsl.2011.04.005 2022-07-29T06:06:15Z 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). Published 261–271 JCR Journal restricted Article in Journal/Newspaper Antarc* Antarctica Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) 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 |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
CO2 fluxing 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring |
spellingShingle |
CO2 fluxing 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring Oppenheimer, C. Moretti, R. Kyle, P. R. Eschenbacher, A. Lowenstern, J. B. Hervig, R. L. Dunbar, N. W. Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica |
topic_facet |
CO2 fluxing 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring |
description |
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). Published 261–271 JCR Journal restricted |
author2 |
Oppenheimer, C. Moretti, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia Kyle, P. R. Eschenbacher, A. Lowenstern, J. B. Hervig, R. L. Dunbar, N. W. #PLACEHOLDER_PARENT_METADATA_VALUE# Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia |
format |
Article in Journal/Newspaper |
author |
Oppenheimer, C. Moretti, R. Kyle, P. R. Eschenbacher, A. Lowenstern, J. B. Hervig, R. L. Dunbar, N. W. |
author_facet |
Oppenheimer, C. Moretti, R. Kyle, P. R. Eschenbacher, A. Lowenstern, J. B. Hervig, R. L. Dunbar, N. W. |
author_sort |
Oppenheimer, C. |
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 |
Elsevier Science Limited |
publishDate |
2011 |
url |
http://hdl.handle.net/2122/7831 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_relation |
Earth and planetary science letters /306(2011) 0012-821X 1385-013X http://hdl.handle.net/2122/7831 doi:10.1016/j.epsl.2011.04.005 |
op_rights |
restricted |
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 |
_version_ |
1766271555582558208 |