Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge
The origin of the isotopic signature of Indian mid-ocean ridge basalts has remained enigmatic, because the geochemical composition of these basalts is consistent either with pollution from recycled, ancient altered oceanic crust and sediments, or with ancient continental crust or lithosphere. The ra...
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ftunivnantes:oai:HAL:hal-00102158v1 2023-05-15T13:44:36+02:00 Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge B. Hanan, Barry Blichert-Toft, Janne G. Pyle, Douglas M. Christie, David Laboratoire de Sciences de la Terre (LST) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2004 https://hal.science/hal-00102158 https://doi.org/10.1038/nature03026 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/nature03026 hal-00102158 https://hal.science/hal-00102158 doi:10.1038/nature03026 ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-00102158 Nature, 2004, 432, pp.91-94. ⟨10.1038/nature03026⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2004 ftunivnantes https://doi.org/10.1038/nature03026 2023-02-08T11:08:04Z The origin of the isotopic signature of Indian mid-ocean ridge basalts has remained enigmatic, because the geochemical composition of these basalts is consistent either with pollution from recycled, ancient altered oceanic crust and sediments, or with ancient continental crust or lithosphere. The radiogenic isotopic signature may therefore be the result of contamination of the upper mantle by plumes containing recycled altered ancient oceanic crust and sediments, detachment and dispersal of continental material into the shallow mantle during rifting and breakup of Gondwana, or contamination of the upper mantle by ancient subduction processes. The identification of a process operating on a scale large enough to affect major portions of the Indian mid-ocean ridge basalt source region has been a long-standing problem. Here we present hafnium and lead isotope data from across the Indian-Pacific mantle boundary at the Australian-Antarctic discordance region of the Southeast Indian Ridge, which demonstrate that the Pacific and Indian upper mantle basalt source domains were each affected by different mechanisms. We infer that the Indian upper-mantle isotope signature in this region is affected mainly by lower continental crust entrained during Gondwana rifting, whereas the isotope signature of the Pacific upper mantle is influenced predominantly by ocean floor subduction-related processes. Article in Journal/Newspaper Antarc* Antarctic Université de Nantes: HAL-UNIV-NANTES Antarctic Pacific Indian Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Australian-Antarctic Discordance ENVELOPE(124.000,124.000,-49.000,-49.000) Nature 432 7013 91 94 |
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Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry B. Hanan, Barry Blichert-Toft, Janne G. Pyle, Douglas M. Christie, David Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
The origin of the isotopic signature of Indian mid-ocean ridge basalts has remained enigmatic, because the geochemical composition of these basalts is consistent either with pollution from recycled, ancient altered oceanic crust and sediments, or with ancient continental crust or lithosphere. The radiogenic isotopic signature may therefore be the result of contamination of the upper mantle by plumes containing recycled altered ancient oceanic crust and sediments, detachment and dispersal of continental material into the shallow mantle during rifting and breakup of Gondwana, or contamination of the upper mantle by ancient subduction processes. The identification of a process operating on a scale large enough to affect major portions of the Indian mid-ocean ridge basalt source region has been a long-standing problem. Here we present hafnium and lead isotope data from across the Indian-Pacific mantle boundary at the Australian-Antarctic discordance region of the Southeast Indian Ridge, which demonstrate that the Pacific and Indian upper mantle basalt source domains were each affected by different mechanisms. We infer that the Indian upper-mantle isotope signature in this region is affected mainly by lower continental crust entrained during Gondwana rifting, whereas the isotope signature of the Pacific upper mantle is influenced predominantly by ocean floor subduction-related processes. |
author2 |
Laboratoire de Sciences de la Terre (LST) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
B. Hanan, Barry Blichert-Toft, Janne G. Pyle, Douglas M. Christie, David |
author_facet |
B. Hanan, Barry Blichert-Toft, Janne G. Pyle, Douglas M. Christie, David |
author_sort |
B. Hanan, Barry |
title |
Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge |
title_short |
Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge |
title_full |
Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge |
title_fullStr |
Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge |
title_full_unstemmed |
Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the Southeast Indian Ridge |
title_sort |
contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the southeast indian ridge |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00102158 https://doi.org/10.1038/nature03026 |
long_lat |
ENVELOPE(110.000,110.000,-50.000,-50.000) ENVELOPE(124.000,124.000,-49.000,-49.000) |
geographic |
Antarctic Pacific Indian Southeast Indian Ridge Australian-Antarctic Discordance |
geographic_facet |
Antarctic Pacific Indian Southeast Indian Ridge Australian-Antarctic Discordance |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-00102158 Nature, 2004, 432, pp.91-94. ⟨10.1038/nature03026⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/nature03026 hal-00102158 https://hal.science/hal-00102158 doi:10.1038/nature03026 |
op_doi |
https://doi.org/10.1038/nature03026 |
container_title |
Nature |
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432 |
container_issue |
7013 |
container_start_page |
91 |
op_container_end_page |
94 |
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1766203944294416384 |