Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica
The chemistry of gases measured in ice caves and from warm geothermal ground at Erebus volcano, Antarctica, shows that gas emissions are dominated by air, with varying amounts of added volcanic CO2. This suggests widespread circulation of air through the volcanic edifice, as well as spatially or tem...
Published in: | Journal of Volcanology and Geothermal Research |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Elsevier BV
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/10371/197968 https://doi.org/10.1016/j.jvolgeores.2019.05.017 |
id |
ftseoulnuniv:oai:s-space.snu.ac.kr:10371/197968 |
---|---|
record_format |
openpolar |
spelling |
ftseoulnuniv:oai:s-space.snu.ac.kr:10371/197968 2024-01-14T10:01:03+01:00 Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica Ilanko, T. Fischer, T. P. Kyle, P. Curtis, A. Lee, H. Sano, Y. Lee, H. 2020-04-03 https://hdl.handle.net/10371/197968 https://doi.org/10.1016/j.jvolgeores.2019.05.017 영어 unknown Elsevier BV Journal of Volcanology and Geothermal Research, Vol.381, pp.119-139 0377-0273 https://hdl.handle.net/10371/197968 doi:10.1016/j.jvolgeores.2019.05.017 000480378900008 2-s2.0-85067064458 94638 CARBON-ISOTOPE FRACTIONATION RIFT SYSTEM ERUPTIVE HISTORY MANTLE PLUME ROSS ISLAND LONG-TERM SOIL CO2 NITROGEN DIOXIDE WATER Fumarolic ice caves Volcanic degassing Carbon dioxide Erebus volcano Article ART 2020 ftseoulnuniv https://doi.org/10.1016/j.jvolgeores.2019.05.017 2023-12-15T01:39:55Z The chemistry of gases measured in ice caves and from warm geothermal ground at Erebus volcano, Antarctica, shows that gas emissions are dominated by air, with varying amounts of added volcanic CO2. This suggests widespread circulation of air through the volcanic edifice, as well as spatially or temporally varying contributions from magmatic degassing. The resulting gases are further modified by two processes. The first is CO2 dissolution in water, resulting in fractionation from magmatic delta C-13-CO2 values, which are estimated to be around -4%., to heavier values, up to 1%. Assuming all magmatic CO2 is dissolved in neutral water as HCOi', this requires hydrothermal temperatures of over 120 degrees C. However, other phases such as calcite may be present, implying even higher temperatures, while lower water pH values could result in similar isotope ratios at much lower temperatures, such as 60 degrees C at pH of 53. A large proportion of magmatic CO2 must be lost to this hydrothermal system or to mixing with air. The hydrothermal influence is localized to certain areas on the volcano, which may be associated with high velocity zones identified in previous studies by seismic tomography. Two sites with stronger magmatic signatures, by contrast, are above low velocity zones representing possible shallow magma storage. The second modification is the removal of oxygen from both deeply-sourced and air-derived gases. This is likely due to prevailing conditions in the subsurface, as it is independent of the original source of the gases and of hydrothermal modifications; and thus may affect sites with magmatic, air-like, or hydrothermal signatures. (C) 2019 Elsevier B.V. All rights reserved. Y 1 Article in Journal/Newspaper Antarc* Antarctica Ross Island Seoul National University: S-Space Ross Island Journal of Volcanology and Geothermal Research 381 119 139 |
institution |
Open Polar |
collection |
Seoul National University: S-Space |
op_collection_id |
ftseoulnuniv |
language |
unknown |
topic |
CARBON-ISOTOPE FRACTIONATION RIFT SYSTEM ERUPTIVE HISTORY MANTLE PLUME ROSS ISLAND LONG-TERM SOIL CO2 NITROGEN DIOXIDE WATER Fumarolic ice caves Volcanic degassing Carbon dioxide Erebus volcano |
spellingShingle |
CARBON-ISOTOPE FRACTIONATION RIFT SYSTEM ERUPTIVE HISTORY MANTLE PLUME ROSS ISLAND LONG-TERM SOIL CO2 NITROGEN DIOXIDE WATER Fumarolic ice caves Volcanic degassing Carbon dioxide Erebus volcano Ilanko, T. Fischer, T. P. Kyle, P. Curtis, A. Lee, H. Sano, Y. Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica |
topic_facet |
CARBON-ISOTOPE FRACTIONATION RIFT SYSTEM ERUPTIVE HISTORY MANTLE PLUME ROSS ISLAND LONG-TERM SOIL CO2 NITROGEN DIOXIDE WATER Fumarolic ice caves Volcanic degassing Carbon dioxide Erebus volcano |
description |
The chemistry of gases measured in ice caves and from warm geothermal ground at Erebus volcano, Antarctica, shows that gas emissions are dominated by air, with varying amounts of added volcanic CO2. This suggests widespread circulation of air through the volcanic edifice, as well as spatially or temporally varying contributions from magmatic degassing. The resulting gases are further modified by two processes. The first is CO2 dissolution in water, resulting in fractionation from magmatic delta C-13-CO2 values, which are estimated to be around -4%., to heavier values, up to 1%. Assuming all magmatic CO2 is dissolved in neutral water as HCOi', this requires hydrothermal temperatures of over 120 degrees C. However, other phases such as calcite may be present, implying even higher temperatures, while lower water pH values could result in similar isotope ratios at much lower temperatures, such as 60 degrees C at pH of 53. A large proportion of magmatic CO2 must be lost to this hydrothermal system or to mixing with air. The hydrothermal influence is localized to certain areas on the volcano, which may be associated with high velocity zones identified in previous studies by seismic tomography. Two sites with stronger magmatic signatures, by contrast, are above low velocity zones representing possible shallow magma storage. The second modification is the removal of oxygen from both deeply-sourced and air-derived gases. This is likely due to prevailing conditions in the subsurface, as it is independent of the original source of the gases and of hydrothermal modifications; and thus may affect sites with magmatic, air-like, or hydrothermal signatures. (C) 2019 Elsevier B.V. All rights reserved. Y 1 |
author2 |
Lee, H. |
format |
Article in Journal/Newspaper |
author |
Ilanko, T. Fischer, T. P. Kyle, P. Curtis, A. Lee, H. Sano, Y. |
author_facet |
Ilanko, T. Fischer, T. P. Kyle, P. Curtis, A. Lee, H. Sano, Y. |
author_sort |
Ilanko, T. |
title |
Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica |
title_short |
Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica |
title_full |
Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica |
title_fullStr |
Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica |
title_full_unstemmed |
Modification of fumarolic gases by the ice-covered edifice of Erebus volcano, Antarctica |
title_sort |
modification of fumarolic gases by the ice-covered edifice of erebus volcano, antarctica |
publisher |
Elsevier BV |
publishDate |
2020 |
url |
https://hdl.handle.net/10371/197968 https://doi.org/10.1016/j.jvolgeores.2019.05.017 |
geographic |
Ross Island |
geographic_facet |
Ross Island |
genre |
Antarc* Antarctica Ross Island |
genre_facet |
Antarc* Antarctica Ross Island |
op_relation |
Journal of Volcanology and Geothermal Research, Vol.381, pp.119-139 0377-0273 https://hdl.handle.net/10371/197968 doi:10.1016/j.jvolgeores.2019.05.017 000480378900008 2-s2.0-85067064458 94638 |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2019.05.017 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
381 |
container_start_page |
119 |
op_container_end_page |
139 |
_version_ |
1788066888845099008 |