Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge
The southern Pacific Ocean offers the rare possibility to study a situation where a spreading ridge (the Pacific-Antarctic Ridge (PAR)) migrates toward a fixed hot spot (the Louisville hot spot) (Small, 1995). Hollister Ridge is a 450 km long linear structure whose position, between the PAR axis and...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2005
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Online Access: | https://hal.science/hal-00114378 https://hal.science/hal-00114378/document https://hal.science/hal-00114378/file/2004GC000902.pdf https://doi.org/10.1029/2004GC000902 |
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ftunivsavoie:oai:HAL:hal-00114378v1 |
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Open Polar |
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Université Savoie Mont Blanc: HAL |
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ftunivsavoie |
language |
English |
topic |
plume-ridge interaction [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
plume-ridge interaction [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Vlastélic, Ivan Dosso, Laure Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge |
topic_facet |
plume-ridge interaction [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
The southern Pacific Ocean offers the rare possibility to study a situation where a spreading ridge (the Pacific-Antarctic Ridge (PAR)) migrates toward a fixed hot spot (the Louisville hot spot) (Small, 1995). Hollister Ridge is a 450 km long linear structure whose position, between the PAR axis and the most recent edifices of the Louisville hot spot trail, led some authors to suggest that the ridge is genetically related to the hot spot (Small, 1995; Wessel and Kroenke, 1997). Mapping and sampling of the ridge in 1996 revealed, however, that the contribution of the Louisville plume material to its mantle source is minor and suggested that it might be the result of intraplate deformation (Géli et al., 1998; Vlastélic et al., 1998). We report new, highly precise Pb isotopic data from Hollister Ridge, which (1) confirm that the maximal contribution of the Louisville plume, in the centrally, volcanic active part of the ridge, probably does not exceed 20% (15 and 35% for lower and upper limits) and (2) reveal through time an increasing plume influence. The initiation of the Louisville plume involvement in the source of Hollister Ridge is estimated to have occurred between 1.04 and 0.77 Myr ago. It thus followed closely the most recent volcanic activity reported along the Louisville trail (1.11 Ma (Koppers et al., 2004)). This suggests that Hollister Ridge has recorded the dispersion of the Louisville plume as the spreading ridge approached the hot spot. Assuming that the Louisville hot spot is located near the youngest seamount dredged along the Louisville seamount chain, Hollister Ridge lies along the shortest path of pressure release connecting the hot spot to the spreading axis. This path involves, first, an abrupt upwelling across the Eltanin fault system and, subsequently, a more progressive migration toward the spreading axis. Because Hollister Ridge is older than 2.5 Ma, the structure might not be the consequence of the plume-ridge flow. Instead, Hollister Ridge most likely emplaced through a lithospheric ... |
author2 |
Laboratoire de Géodynamique des Chaines Alpines (LGCA) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-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 |
Vlastélic, Ivan Dosso, Laure |
author_facet |
Vlastélic, Ivan Dosso, Laure |
author_sort |
Vlastélic, Ivan |
title |
Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge |
title_short |
Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge |
title_full |
Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge |
title_fullStr |
Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge |
title_full_unstemmed |
Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge |
title_sort |
initiation of a plume-ridge interaction in the south pacific recorded by high-precision pb isotopes along hollister ridge |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00114378 https://hal.science/hal-00114378/document https://hal.science/hal-00114378/file/2004GC000902.pdf https://doi.org/10.1029/2004GC000902 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-00114378 Geochemistry, Geophysics, Geosystems, 2005, 6 (5), pp.Q05011. ⟨10.1029/2004GC000902⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2004GC000902 hal-00114378 https://hal.science/hal-00114378 https://hal.science/hal-00114378/document https://hal.science/hal-00114378/file/2004GC000902.pdf doi:10.1029/2004GC000902 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2004GC000902 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
6 |
container_issue |
5 |
container_start_page |
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op_container_end_page |
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1797572784153427968 |
spelling |
ftunivsavoie:oai:HAL:hal-00114378v1 2024-04-28T08:00:40+00:00 Initiation of a plume-ridge interaction in the South Pacific recorded by high-precision Pb isotopes along Hollister Ridge Vlastélic, Ivan Dosso, Laure Laboratoire de Géodynamique des Chaines Alpines (LGCA) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-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) 2005-05-28 https://hal.science/hal-00114378 https://hal.science/hal-00114378/document https://hal.science/hal-00114378/file/2004GC000902.pdf https://doi.org/10.1029/2004GC000902 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2004GC000902 hal-00114378 https://hal.science/hal-00114378 https://hal.science/hal-00114378/document https://hal.science/hal-00114378/file/2004GC000902.pdf doi:10.1029/2004GC000902 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-00114378 Geochemistry, Geophysics, Geosystems, 2005, 6 (5), pp.Q05011. ⟨10.1029/2004GC000902⟩ plume-ridge interaction [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2005 ftunivsavoie https://doi.org/10.1029/2004GC000902 2024-04-11T00:37:57Z The southern Pacific Ocean offers the rare possibility to study a situation where a spreading ridge (the Pacific-Antarctic Ridge (PAR)) migrates toward a fixed hot spot (the Louisville hot spot) (Small, 1995). Hollister Ridge is a 450 km long linear structure whose position, between the PAR axis and the most recent edifices of the Louisville hot spot trail, led some authors to suggest that the ridge is genetically related to the hot spot (Small, 1995; Wessel and Kroenke, 1997). Mapping and sampling of the ridge in 1996 revealed, however, that the contribution of the Louisville plume material to its mantle source is minor and suggested that it might be the result of intraplate deformation (Géli et al., 1998; Vlastélic et al., 1998). We report new, highly precise Pb isotopic data from Hollister Ridge, which (1) confirm that the maximal contribution of the Louisville plume, in the centrally, volcanic active part of the ridge, probably does not exceed 20% (15 and 35% for lower and upper limits) and (2) reveal through time an increasing plume influence. The initiation of the Louisville plume involvement in the source of Hollister Ridge is estimated to have occurred between 1.04 and 0.77 Myr ago. It thus followed closely the most recent volcanic activity reported along the Louisville trail (1.11 Ma (Koppers et al., 2004)). This suggests that Hollister Ridge has recorded the dispersion of the Louisville plume as the spreading ridge approached the hot spot. Assuming that the Louisville hot spot is located near the youngest seamount dredged along the Louisville seamount chain, Hollister Ridge lies along the shortest path of pressure release connecting the hot spot to the spreading axis. This path involves, first, an abrupt upwelling across the Eltanin fault system and, subsequently, a more progressive migration toward the spreading axis. Because Hollister Ridge is older than 2.5 Ma, the structure might not be the consequence of the plume-ridge flow. Instead, Hollister Ridge most likely emplaced through a lithospheric ... Article in Journal/Newspaper Antarc* Antarctic Université Savoie Mont Blanc: HAL Geochemistry, Geophysics, Geosystems 6 5 n/a n/a |