Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments.
International audience The Middle Miocene transition from carbonate to biosilica sedimentation at DSDP site 266 (Australian-Antarctic basin) reflects a global transition toward a colder climate. The 143Nd/144Nd, 176Hf/177Hf, and Al/Ti of bulk sediments display systematic, coupled variations through...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://hal.science/hal-00101857 https://hal.science/hal-00101857/document https://hal.science/hal-00101857/file/2004GC000819.pdf https://doi.org/10.1029/2004GC000819 |
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ftunivnantes:oai:HAL:hal-00101857v1 2023-05-15T13:35:39+02:00 Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments. Vlastélic, Ivan Carpentier, M. Lewin, Eric 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) 2005 https://hal.science/hal-00101857 https://hal.science/hal-00101857/document https://hal.science/hal-00101857/file/2004GC000819.pdf https://doi.org/10.1029/2004GC000819 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2004GC000819 hal-00101857 https://hal.science/hal-00101857 https://hal.science/hal-00101857/document https://hal.science/hal-00101857/file/2004GC000819.pdf doi:10.1029/2004GC000819 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-00101857 Geochemistry, Geophysics, Geosystems, 2005, 6, pp.Q03003. ⟨10.1029/2004GC000819⟩ Antarctic climate change Miocene sediments radiogenic isotopes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2005 ftunivnantes https://doi.org/10.1029/2004GC000819 2023-03-01T02:39:46Z International audience The Middle Miocene transition from carbonate to biosilica sedimentation at DSDP site 266 (Australian-Antarctic basin) reflects a global transition toward a colder climate. The 143Nd/144Nd, 176Hf/177Hf, and Al/Ti of bulk sediments display systematic, coupled variations through time, which have been attributed to a change of the detrital source. This change could correspond to a reduction of input from the Antarctic continent, an increase of input from the Kerguelen volcanic province, or both. Mixing models based on Nd isotopes and Al/Ti suggest a 30–40% reduction of Antarctic input and an equivalent increase of Kerguelen input during the Miocene. Reduction of Antarctic input may result from the formation of a stable East Antarctic ice sheet. Consistently, Pb isotopes and trace element systematics suggest a change of weathering style during the Miocene, with an increase in physical weathering, or a reduction of chemical weathering, after 15 Ma. Increase of Kerguelen input may reflect the initiation, or enhancement, of the Antarctic Circumpolar Current (ACC), thus raising the possibility of a simultaneous onset of North Atlantic Deep Water production and the ACC during the Middle Miocene. In addition, large geochemical oscillations occurred during the Pliocene, possibly reflecting fluctuation in strength of the ACC or, alternatively, periods of instability of the Antarctic ice sheet. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet North Atlantic Deep Water North Atlantic Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Southern Ocean The Antarctic Kerguelen East Antarctic Ice Sheet Australian Antarctic Basin ENVELOPE(120.000,120.000,-60.000,-60.000) Australian-Antarctic Basin ENVELOPE(134.115,134.115,-58.800,-58.800) Geochemistry, Geophysics, Geosystems 6 3 n/a n/a |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Antarctic climate change Miocene sediments radiogenic isotopes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Antarctic climate change Miocene sediments radiogenic isotopes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Vlastélic, Ivan Carpentier, M. Lewin, Eric Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments. |
topic_facet |
Antarctic climate change Miocene sediments radiogenic isotopes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience The Middle Miocene transition from carbonate to biosilica sedimentation at DSDP site 266 (Australian-Antarctic basin) reflects a global transition toward a colder climate. The 143Nd/144Nd, 176Hf/177Hf, and Al/Ti of bulk sediments display systematic, coupled variations through time, which have been attributed to a change of the detrital source. This change could correspond to a reduction of input from the Antarctic continent, an increase of input from the Kerguelen volcanic province, or both. Mixing models based on Nd isotopes and Al/Ti suggest a 30–40% reduction of Antarctic input and an equivalent increase of Kerguelen input during the Miocene. Reduction of Antarctic input may result from the formation of a stable East Antarctic ice sheet. Consistently, Pb isotopes and trace element systematics suggest a change of weathering style during the Miocene, with an increase in physical weathering, or a reduction of chemical weathering, after 15 Ma. Increase of Kerguelen input may reflect the initiation, or enhancement, of the Antarctic Circumpolar Current (ACC), thus raising the possibility of a simultaneous onset of North Atlantic Deep Water production and the ACC during the Middle Miocene. In addition, large geochemical oscillations occurred during the Pliocene, possibly reflecting fluctuation in strength of the ACC or, alternatively, periods of instability of the Antarctic ice sheet. |
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) |
format |
Article in Journal/Newspaper |
author |
Vlastélic, Ivan Carpentier, M. Lewin, Eric |
author_facet |
Vlastélic, Ivan Carpentier, M. Lewin, Eric |
author_sort |
Vlastélic, Ivan |
title |
Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments. |
title_short |
Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments. |
title_full |
Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments. |
title_fullStr |
Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments. |
title_full_unstemmed |
Miocene climate change recorded in the chemical and isotopic (Pb, Nd, Hf) signature of Southern Ocean sediments. |
title_sort |
miocene climate change recorded in the chemical and isotopic (pb, nd, hf) signature of southern ocean sediments. |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00101857 https://hal.science/hal-00101857/document https://hal.science/hal-00101857/file/2004GC000819.pdf https://doi.org/10.1029/2004GC000819 |
long_lat |
ENVELOPE(120.000,120.000,-60.000,-60.000) ENVELOPE(134.115,134.115,-58.800,-58.800) |
geographic |
Antarctic Southern Ocean The Antarctic Kerguelen East Antarctic Ice Sheet Australian Antarctic Basin Australian-Antarctic Basin |
geographic_facet |
Antarctic Southern Ocean The Antarctic Kerguelen East Antarctic Ice Sheet Australian Antarctic Basin Australian-Antarctic Basin |
genre |
Antarc* Antarctic Ice Sheet North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-00101857 Geochemistry, Geophysics, Geosystems, 2005, 6, pp.Q03003. ⟨10.1029/2004GC000819⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2004GC000819 hal-00101857 https://hal.science/hal-00101857 https://hal.science/hal-00101857/document https://hal.science/hal-00101857/file/2004GC000819.pdf doi:10.1029/2004GC000819 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2004GC000819 |
container_title |
Geochemistry, Geophysics, Geosystems |
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6 |
container_issue |
3 |
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1766068556096602112 |