New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S
International audience We investigated the morphology and structure of the Pacific-Antarctic Ridge between 52°45′S and 41°15′S during the Pacantarctic2 cruise using multibeam echosounder together with gravity measurements and dredges. Analysis of the bathymetric, gravity and geochemical data reveal...
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Online Access: | https://hal.science/hal-00114263 https://hal.science/hal-00114263/document https://hal.science/hal-00114263/file/GRL-Klingelhoefer-2006.pdf https://doi.org/10.1029/2006GL027335 |
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ftmeteofrance:oai:HAL:hal-00114263v1 2024-04-28T07:56:58+00:00 New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S Klingelhoefer, F. Ondréas, H. Briais, A. Hamelin, C. Dosso, Laure Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Dynamique terrestre et planétaire (DTP) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-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) 2006-11-08 https://hal.science/hal-00114263 https://hal.science/hal-00114263/document https://hal.science/hal-00114263/file/GRL-Klingelhoefer-2006.pdf https://doi.org/10.1029/2006GL027335 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GL027335 hal-00114263 https://hal.science/hal-00114263 https://hal.science/hal-00114263/document https://hal.science/hal-00114263/file/GRL-Klingelhoefer-2006.pdf doi:10.1029/2006GL027335 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00114263 Geophysical Research Letters, 2006, 33, pp.L21312. ⟨10.1029/2006GL027335⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2006 ftmeteofrance https://doi.org/10.1029/2006GL027335 2024-04-10T23:58:45Z International audience We investigated the morphology and structure of the Pacific-Antarctic Ridge between 52°45′S and 41°15′S during the Pacantarctic2 cruise using multibeam echosounder together with gravity measurements and dredges. Analysis of the bathymetric, gravity and geochemical data reveal three ridge segments separated by overlapping spreading centers south of the Menard transform fault (MTF) and five segments north of it. Calculation of the cross-sectional area allows quantification of the variation in size of the axial bathymetric high. Together with the calculation of the mantle Bouguer anomaly, these data provide information about variations in the temperature of the underlying mantle or in crustal thickness. Areas with hotter mantle are found north and south of the MTF. Geochemical analyses of samples dredged during the survey show a correlation of high cross-sectional area values and negative mantle Bouguer anomalies in the middle of segments with relatively less depleted basalts. Article in Journal/Newspaper Antarc* Antarctic Météo-France: HAL Geophysical Research Letters 33 21 |
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Open Polar |
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Météo-France: HAL |
op_collection_id |
ftmeteofrance |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
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[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes Klingelhoefer, F. Ondréas, H. Briais, A. Hamelin, C. Dosso, Laure New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience We investigated the morphology and structure of the Pacific-Antarctic Ridge between 52°45′S and 41°15′S during the Pacantarctic2 cruise using multibeam echosounder together with gravity measurements and dredges. Analysis of the bathymetric, gravity and geochemical data reveal three ridge segments separated by overlapping spreading centers south of the Menard transform fault (MTF) and five segments north of it. Calculation of the cross-sectional area allows quantification of the variation in size of the axial bathymetric high. Together with the calculation of the mantle Bouguer anomaly, these data provide information about variations in the temperature of the underlying mantle or in crustal thickness. Areas with hotter mantle are found north and south of the MTF. Geochemical analyses of samples dredged during the survey show a correlation of high cross-sectional area values and negative mantle Bouguer anomalies in the middle of segments with relatively less depleted basalts. |
author2 |
Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Dynamique terrestre et planétaire (DTP) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-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) |
format |
Article in Journal/Newspaper |
author |
Klingelhoefer, F. Ondréas, H. Briais, A. Hamelin, C. Dosso, Laure |
author_facet |
Klingelhoefer, F. Ondréas, H. Briais, A. Hamelin, C. Dosso, Laure |
author_sort |
Klingelhoefer, F. |
title |
New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S |
title_short |
New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S |
title_full |
New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S |
title_fullStr |
New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S |
title_full_unstemmed |
New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45′S and 41°15′S |
title_sort |
new structural and geochemical observations from the pacific-antarctic ridge between 52°45′s and 41°15′s |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00114263 https://hal.science/hal-00114263/document https://hal.science/hal-00114263/file/GRL-Klingelhoefer-2006.pdf https://doi.org/10.1029/2006GL027335 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00114263 Geophysical Research Letters, 2006, 33, pp.L21312. ⟨10.1029/2006GL027335⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GL027335 hal-00114263 https://hal.science/hal-00114263 https://hal.science/hal-00114263/document https://hal.science/hal-00114263/file/GRL-Klingelhoefer-2006.pdf doi:10.1029/2006GL027335 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2006GL027335 |
container_title |
Geophysical Research Letters |
container_volume |
33 |
container_issue |
21 |
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1797585882017955840 |