Backward tracking of gas chemistry measurements at Erebus volcano
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...
Published in: | Geochemistry, Geophysics, Geosystems |
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ftuncamerinoiris:oai:pubblicazioni.unicam.it:11581/269587 2024-04-21T07:50:54+00:00 Backward tracking of gas chemistry measurements at Erebus volcano A. Burgisser C. Oppenheimer M. Alletti P. Kyle B. Scaillet CARROLL, Michael Robert A., Burgisser C., Oppenheimer M., Alletti P., Kyle B., Scaillet Carroll, Michael Robert 2012 STAMPA http://hdl.handle.net/11581/269587 https://doi.org/10.1029/2012GC004243 http://www.scopus.com/inward/record.url?eid=2-s2.0-84870410059&partnerID=40&md5=b29f84950128676e1a258afb9b5319a7 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000311560800001 volume:13 issue:11 firstpage:1 lastpage:24 numberofpages:24 journal:GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS http://hdl.handle.net/11581/269587 doi:10.1029/2012GC004243 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84870410059 http://www.scopus.com/inward/record.url?eid=2-s2.0-84870410059&partnerID=40&md5=b29f84950128676e1a258afb9b5319a7 info:eu-repo/semantics/article 2012 ftuncamerinoiris https://doi.org/10.1029/2012GC004243 2024-03-28T01:23:10Z 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 300C 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). © 2012. American Geophysical Union. All Rights Reserved. Article in Journal/Newspaper Antarc* Antarctica CAMPUS Pubblicazioni Scientifiche Unicam (Università di Camerino) Geochemistry, Geophysics, Geosystems 13 11 |
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Open Polar |
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CAMPUS Pubblicazioni Scientifiche Unicam (Università di Camerino) |
op_collection_id |
ftuncamerinoiris |
language |
English |
description |
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 300C 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). © 2012. American Geophysical Union. All Rights Reserved. |
author2 |
A., Burgisser C., Oppenheimer M., Alletti P., Kyle B., Scaillet Carroll, Michael Robert |
format |
Article in Journal/Newspaper |
author |
A. Burgisser C. Oppenheimer M. Alletti P. Kyle B. Scaillet CARROLL, Michael Robert |
spellingShingle |
A. Burgisser C. Oppenheimer M. Alletti P. Kyle B. Scaillet CARROLL, Michael Robert Backward tracking of gas chemistry measurements at Erebus volcano |
author_facet |
A. Burgisser C. Oppenheimer M. Alletti P. Kyle B. Scaillet CARROLL, Michael Robert |
author_sort |
A. Burgisser |
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 |
publishDate |
2012 |
url |
http://hdl.handle.net/11581/269587 https://doi.org/10.1029/2012GC004243 http://www.scopus.com/inward/record.url?eid=2-s2.0-84870410059&partnerID=40&md5=b29f84950128676e1a258afb9b5319a7 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000311560800001 volume:13 issue:11 firstpage:1 lastpage:24 numberofpages:24 journal:GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS http://hdl.handle.net/11581/269587 doi:10.1029/2012GC004243 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84870410059 http://www.scopus.com/inward/record.url?eid=2-s2.0-84870410059&partnerID=40&md5=b29f84950128676e1a258afb9b5319a7 |
op_doi |
https://doi.org/10.1029/2012GC004243 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
13 |
container_issue |
11 |
_version_ |
1796934451509329920 |