Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica
International audience Field observations and petrological studies have recently advanced understanding of the magmatic system of Erebus volcano, renowned for its sustained CO2-rich degassing, and long-lived phonolitic lava lake. However, this body of work has highlighted uncertainty in several key...
Published in: | Journal of Petrology |
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Main Authors: | , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2013
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Subjects: | |
Online Access: | https://doi.org/10.1093/petrology/egt012 https://hal-insu.archives-ouvertes.fr/insu-00813668/file/JPet-Moussallam.pdf https://hal-insu.archives-ouvertes.fr/insu-00813668 |
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fttriple:oai:gotriple.eu:10670/1.yp86r7 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
phonolite Erebus degassing CO2 phase equilibrium lava lake geo envir |
spellingShingle |
phonolite Erebus degassing CO2 phase equilibrium lava lake geo envir Moussallam, Yves Oppenheimer, Clive Scaillet, Bruno Kyle, Philip R. Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica |
topic_facet |
phonolite Erebus degassing CO2 phase equilibrium lava lake geo envir |
description |
International audience Field observations and petrological studies have recently advanced understanding of the magmatic system of Erebus volcano, renowned for its sustained CO2-rich degassing, and long-lived phonolitic lava lake. However, this body of work has highlighted uncertainty in several key parameters, including the magma temperature, redox state and the depth of the reservoir presumed to maintain the lava lake. Here, we use experimentally determined phase equilibria to constrain these unknowns. The experiments ranged in temperature from 900 to 1025°C, in pressure from atmospheric to 300 MPa, in water content from 0 to 8 wt %, and in oxygen fugacity from NNO + 4 (where NNO is nickel-nickel oxide) to QFM - 2 (where QFM is quartz-fayalite-magnetite). The natural system was experimentally reproduced at 950 ± 25°C, a pressure below 200 MPa, redox conditions between QFM and QFM - 1, and remarkably low water contents of less than 0*5 wt %. These findings help in understanding petrological observations, including melt inclusion data, as well as the measured composition of gas emissions from the lava lake. Biotite and amphibole appear in the crystallization sequence at around 925°C, even under very dry conditions (biotite). Both biotite and amphibole are absent in the phonolites erupted over the last 20 kyr at Erebus. The constant abundance of anorthoclase observed in the erupted lavas and bombs indicates that the shallow magmatic system feeding the Erebus lava lake (below pressures of 200 MPa) has been thermally buffered at 950 ± 25°C over this time period, possibly reflecting steady-state connection with the deep feeding system rooted in the mantle. Combined with recent seismological data, our results suggest that if a large phonolitic reservoir exists, then it should lie in the depth range 4-7*5 km. The tight constraints on temperature and redox conditions will be valuable for future thermodynamical and rheological modelling. |
author2 |
Department of Geography Cambridge, UK University of Cambridge UK (CAM) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) New Mexico Institute of Mining and Technology New Mexico Tech (NMT) |
format |
Article in Journal/Newspaper |
author |
Moussallam, Yves Oppenheimer, Clive Scaillet, Bruno Kyle, Philip R. |
author_facet |
Moussallam, Yves Oppenheimer, Clive Scaillet, Bruno Kyle, Philip R. |
author_sort |
Moussallam, Yves |
title |
Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica |
title_short |
Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica |
title_full |
Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica |
title_fullStr |
Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica |
title_full_unstemmed |
Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica |
title_sort |
experimental phase-equilibrium constraints on the phonolite magmatic system of erebus volcano, antarctica |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://doi.org/10.1093/petrology/egt012 https://hal-insu.archives-ouvertes.fr/insu-00813668/file/JPet-Moussallam.pdf https://hal-insu.archives-ouvertes.fr/insu-00813668 |
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 |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0022-3530 EISSN: 1460-2415 Journal of Petrology Journal of Petrology, Oxford University Press (OUP), 2013, 54 (7), pp.1285-1307. ⟨10.1093/petrology/egt012⟩ |
op_relation |
insu-00813668 doi:10.1093/petrology/egt012 10670/1.yp86r7 https://hal-insu.archives-ouvertes.fr/insu-00813668/file/JPet-Moussallam.pdf https://hal-insu.archives-ouvertes.fr/insu-00813668 |
op_rights |
lic_creative-commons other |
op_doi |
https://doi.org/10.1093/petrology/egt012 |
container_title |
Journal of Petrology |
container_volume |
54 |
container_issue |
7 |
container_start_page |
1285 |
op_container_end_page |
1307 |
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1766042850316779520 |
spelling |
fttriple:oai:gotriple.eu:10670/1.yp86r7 2023-05-15T13:33:30+02:00 Experimental Phase-equilibrium Constraints on the Phonolite Magmatic System of Erebus Volcano, Antarctica Moussallam, Yves Oppenheimer, Clive Scaillet, Bruno Kyle, Philip R. Department of Geography Cambridge, UK University of Cambridge UK (CAM) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) New Mexico Institute of Mining and Technology New Mexico Tech (NMT) 2013-01-01 https://doi.org/10.1093/petrology/egt012 https://hal-insu.archives-ouvertes.fr/insu-00813668/file/JPet-Moussallam.pdf https://hal-insu.archives-ouvertes.fr/insu-00813668 en eng HAL CCSD Oxford University Press (OUP) insu-00813668 doi:10.1093/petrology/egt012 10670/1.yp86r7 https://hal-insu.archives-ouvertes.fr/insu-00813668/file/JPet-Moussallam.pdf https://hal-insu.archives-ouvertes.fr/insu-00813668 lic_creative-commons other Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0022-3530 EISSN: 1460-2415 Journal of Petrology Journal of Petrology, Oxford University Press (OUP), 2013, 54 (7), pp.1285-1307. ⟨10.1093/petrology/egt012⟩ phonolite Erebus degassing CO2 phase equilibrium lava lake geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.1093/petrology/egt012 2023-01-22T17:43:57Z International audience Field observations and petrological studies have recently advanced understanding of the magmatic system of Erebus volcano, renowned for its sustained CO2-rich degassing, and long-lived phonolitic lava lake. However, this body of work has highlighted uncertainty in several key parameters, including the magma temperature, redox state and the depth of the reservoir presumed to maintain the lava lake. Here, we use experimentally determined phase equilibria to constrain these unknowns. The experiments ranged in temperature from 900 to 1025°C, in pressure from atmospheric to 300 MPa, in water content from 0 to 8 wt %, and in oxygen fugacity from NNO + 4 (where NNO is nickel-nickel oxide) to QFM - 2 (where QFM is quartz-fayalite-magnetite). The natural system was experimentally reproduced at 950 ± 25°C, a pressure below 200 MPa, redox conditions between QFM and QFM - 1, and remarkably low water contents of less than 0*5 wt %. These findings help in understanding petrological observations, including melt inclusion data, as well as the measured composition of gas emissions from the lava lake. Biotite and amphibole appear in the crystallization sequence at around 925°C, even under very dry conditions (biotite). Both biotite and amphibole are absent in the phonolites erupted over the last 20 kyr at Erebus. The constant abundance of anorthoclase observed in the erupted lavas and bombs indicates that the shallow magmatic system feeding the Erebus lava lake (below pressures of 200 MPa) has been thermally buffered at 950 ± 25°C over this time period, possibly reflecting steady-state connection with the deep feeding system rooted in the mantle. Combined with recent seismological data, our results suggest that if a large phonolitic reservoir exists, then it should lie in the depth range 4-7*5 km. The tight constraints on temperature and redox conditions will be valuable for future thermodynamical and rheological modelling. Article in Journal/Newspaper Antarc* Antarctica Unknown Lava Lake ENVELOPE(-128.996,-128.996,55.046,55.046) Journal of Petrology 54 7 1285 1307 |