Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S)
International audience The first isotopic data and concentrations of helium are reported for the Pacific-Antarctic ridge between 52.5°S and 41.5°S. The 4He/3He ratio is extremely homogeneous over more than 1200 km, with a mean ratio of 99,275 (R/Ra = 7.29) and a standard deviation of 2719 (0.19), wh...
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ftunivbrest:oai:HAL:insu-00305185v1 2024-04-28T08:02:43+00:00 Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S) Moreira Manuel, A. Dosso, Laure Ondréas, Hélène Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 2008-05-24 https://insu.hal.science/insu-00305185 https://insu.hal.science/insu-00305185/document https://insu.hal.science/insu-00305185/file/GRL-Moreira-2008.pdf https://doi.org/10.1029/2008GL033286 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2008GL033286 insu-00305185 https://insu.hal.science/insu-00305185 https://insu.hal.science/insu-00305185/document https://insu.hal.science/insu-00305185/file/GRL-Moreira-2008.pdf doi:10.1029/2008GL033286 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://insu.hal.science/insu-00305185 Geophysical Research Letters, 2008, 35, pp.L10306. ⟨10.1029/2008GL033286⟩ helium isotopes mantle geochemistry Pacific-Antarctic ridge [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2008 ftunivbrest https://doi.org/10.1029/2008GL033286 2024-04-10T23:48:29Z International audience The first isotopic data and concentrations of helium are reported for the Pacific-Antarctic ridge between 52.5°S and 41.5°S. The 4He/3He ratio is extremely homogeneous over more than 1200 km, with a mean ratio of 99,275 (R/Ra = 7.29) and a standard deviation of 2719 (0.19), which is the lowest dispersion observed for the global mid oceanic ridge system. Moreover, the Menard T.F. is a frontier between two mantles with slightly different helium isotopic ratios (96,595 ± 1520 and 100,347 ± 2330). No difference in the helium concentration between the two ridge segments defined by the Menard T.F. can be observed, as well as no significant difference in the U and Th contents suggesting that the difference in helium isotopic ratio is old (>500 My) and may represent a slight difference in degassing or/and trace element depletion history Article in Journal/Newspaper Antarc* Antarctic Université de Bretagne Occidentale: HAL Geophysical Research Letters 35 10 |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
helium isotopes mantle geochemistry Pacific-Antarctic ridge [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
helium isotopes mantle geochemistry Pacific-Antarctic ridge [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes Moreira Manuel, A. Dosso, Laure Ondréas, Hélène Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S) |
topic_facet |
helium isotopes mantle geochemistry Pacific-Antarctic ridge [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The first isotopic data and concentrations of helium are reported for the Pacific-Antarctic ridge between 52.5°S and 41.5°S. The 4He/3He ratio is extremely homogeneous over more than 1200 km, with a mean ratio of 99,275 (R/Ra = 7.29) and a standard deviation of 2719 (0.19), which is the lowest dispersion observed for the global mid oceanic ridge system. Moreover, the Menard T.F. is a frontier between two mantles with slightly different helium isotopic ratios (96,595 ± 1520 and 100,347 ± 2330). No difference in the helium concentration between the two ridge segments defined by the Menard T.F. can be observed, as well as no significant difference in the U and Th contents suggesting that the difference in helium isotopic ratio is old (>500 My) and may represent a slight difference in degassing or/and trace element depletion history |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
format |
Article in Journal/Newspaper |
author |
Moreira Manuel, A. Dosso, Laure Ondréas, Hélène |
author_facet |
Moreira Manuel, A. Dosso, Laure Ondréas, Hélène |
author_sort |
Moreira Manuel, A. |
title |
Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S) |
title_short |
Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S) |
title_full |
Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S) |
title_fullStr |
Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S) |
title_full_unstemmed |
Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S) |
title_sort |
helium isotopes on the pacific-antarctic ridge (52.5°–41.5°s) |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://insu.hal.science/insu-00305185 https://insu.hal.science/insu-00305185/document https://insu.hal.science/insu-00305185/file/GRL-Moreira-2008.pdf https://doi.org/10.1029/2008GL033286 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://insu.hal.science/insu-00305185 Geophysical Research Letters, 2008, 35, pp.L10306. ⟨10.1029/2008GL033286⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2008GL033286 insu-00305185 https://insu.hal.science/insu-00305185 https://insu.hal.science/insu-00305185/document https://insu.hal.science/insu-00305185/file/GRL-Moreira-2008.pdf doi:10.1029/2008GL033286 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2008GL033286 |
container_title |
Geophysical Research Letters |
container_volume |
35 |
container_issue |
10 |
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1797574012722741248 |