Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica
Abstract New stable isotope and noble gas data obtained from fumarolic and bubbling gases and hot spring waters sampled from Deception Island, Antarctica, were analysed to constrain the geochemical features of the island's active hydrothermal system and magmatism in the Bransfield back-arc basi...
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Online Access: | http://dx.doi.org/10.1017/s0954102009001783 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009001783 |
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crcambridgeupr:10.1017/s0954102009001783 2024-09-15T17:41:33+00:00 Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica Kusakabe, Minoru Nagao, Keisuke Ohba, Takeshi Seo, Jung Hun Park, Sung-Hyun Lee, Jong Ik Park, Byong-Kwon 2009 http://dx.doi.org/10.1017/s0954102009001783 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009001783 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 21, issue 3, page 255-267 ISSN 0954-1020 1365-2079 journal-article 2009 crcambridgeupr https://doi.org/10.1017/s0954102009001783 2024-08-21T04:04:38Z Abstract New stable isotope and noble gas data obtained from fumarolic and bubbling gases and hot spring waters sampled from Deception Island, Antarctica, were analysed to constrain the geochemical features of the island's active hydrothermal system and magmatism in the Bransfield back-arc basin. The 3 He/ 4 He ratios of the gases (< 9.8 × 10 -6 ), which are slightly lower than typical MORB values, suggest that the Deception Island magma was generated in the mantle wedge of a MORB-type source but the signature was influenced by the addition of radiogenic 4 He derived from subducted components in the former Phoenix Plate. The N 2 /He ratios of fumarolic gas are higher than those of typical mantle-derived gases suggesting that N 2 was added during decomposition of sediments in the subducting slab. The δ 13 C values of -5 to -6‰ for CO 2 also indicate degassing from a MORB-type mantle source. The H 2 /Ar- and SiO 2 geothermometers indicate that the temperatures in the hydrothermal system below Deception Island range from ~150°C to ~300°C. The δD and δ 18 O values measured from fumarolic gas and hot spring waters do not indicate any contribution of magmatic water to the samples. The major ionic components and δD-δ 18 O-δ 34 S values indicate that hot spring waters are a mixture of local meteoric water and seawater. Mn and SiO 2 in spring waters were enriched relative to seawater reflecting water-rock interaction at depth. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Deception Island Cambridge University Press Antarctic Science 21 3 255 267 |
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Open Polar |
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Cambridge University Press |
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language |
English |
description |
Abstract New stable isotope and noble gas data obtained from fumarolic and bubbling gases and hot spring waters sampled from Deception Island, Antarctica, were analysed to constrain the geochemical features of the island's active hydrothermal system and magmatism in the Bransfield back-arc basin. The 3 He/ 4 He ratios of the gases (< 9.8 × 10 -6 ), which are slightly lower than typical MORB values, suggest that the Deception Island magma was generated in the mantle wedge of a MORB-type source but the signature was influenced by the addition of radiogenic 4 He derived from subducted components in the former Phoenix Plate. The N 2 /He ratios of fumarolic gas are higher than those of typical mantle-derived gases suggesting that N 2 was added during decomposition of sediments in the subducting slab. The δ 13 C values of -5 to -6‰ for CO 2 also indicate degassing from a MORB-type mantle source. The H 2 /Ar- and SiO 2 geothermometers indicate that the temperatures in the hydrothermal system below Deception Island range from ~150°C to ~300°C. The δD and δ 18 O values measured from fumarolic gas and hot spring waters do not indicate any contribution of magmatic water to the samples. The major ionic components and δD-δ 18 O-δ 34 S values indicate that hot spring waters are a mixture of local meteoric water and seawater. Mn and SiO 2 in spring waters were enriched relative to seawater reflecting water-rock interaction at depth. |
format |
Article in Journal/Newspaper |
author |
Kusakabe, Minoru Nagao, Keisuke Ohba, Takeshi Seo, Jung Hun Park, Sung-Hyun Lee, Jong Ik Park, Byong-Kwon |
spellingShingle |
Kusakabe, Minoru Nagao, Keisuke Ohba, Takeshi Seo, Jung Hun Park, Sung-Hyun Lee, Jong Ik Park, Byong-Kwon Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica |
author_facet |
Kusakabe, Minoru Nagao, Keisuke Ohba, Takeshi Seo, Jung Hun Park, Sung-Hyun Lee, Jong Ik Park, Byong-Kwon |
author_sort |
Kusakabe, Minoru |
title |
Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica |
title_short |
Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica |
title_full |
Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica |
title_fullStr |
Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica |
title_full_unstemmed |
Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica |
title_sort |
noble gas and stable isotope geochemistry of thermal fluids from deception island, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2009 |
url |
http://dx.doi.org/10.1017/s0954102009001783 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009001783 |
genre |
Antarc* Antarctic Science Antarctica Deception Island |
genre_facet |
Antarc* Antarctic Science Antarctica Deception Island |
op_source |
Antarctic Science volume 21, issue 3, page 255-267 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102009001783 |
container_title |
Antarctic Science |
container_volume |
21 |
container_issue |
3 |
container_start_page |
255 |
op_container_end_page |
267 |
_version_ |
1810487768556503040 |