The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks
International audience The first indisputable evidence for very early differentiation of the silicate Earth came from the extinct 146Sm-142Nd chronometer. 142Nd excesses measured in 3.7-billion-year (Gyr)-old rocks from Isua1, 2 (southwest Greenland) relative to modern terrestrial samples imply thei...
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ftunivlyon:oai:HAL:hal-00801572v1 2024-09-15T18:09:31+00:00 The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks Rizo, Hanika Boyet, Maud Blichert-Toft, Janne O'Neil, Jonathan Rosing, Minik T. Paquette, Jean-Louis Laboratoire Magmas et Volcans (LMV) Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Natural History Museum of Denmark Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) ANR-10-LABX-0006,CLERVOLC,Clermont-Ferrand centre for research on volcanism(2010) 2012 https://hal.science/hal-00801572 https://doi.org/10.1038/nature11565 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/nature11565 hal-00801572 https://hal.science/hal-00801572 doi:10.1038/nature11565 ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-00801572 Nature, 2012, 491, pp.96-100. ⟨10.1038/nature11565⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2012 ftunivlyon https://doi.org/10.1038/nature11565 2024-07-08T23:59:49Z International audience The first indisputable evidence for very early differentiation of the silicate Earth came from the extinct 146Sm-142Nd chronometer. 142Nd excesses measured in 3.7-billion-year (Gyr)-old rocks from Isua1, 2 (southwest Greenland) relative to modern terrestrial samples imply their derivation from a depleted mantle formed in the Hadean eon (about 4,570-4,000 Gyr ago). As dictated by mass balance, the differentiation event responsible for the formation of the Isua early-depleted reservoir must also have formed a complementary enriched component. However, considerable efforts to find early-enriched mantle components in Isua have so far been unsuccessful3, 4, 5, 6, 7. Here we show that the signature of the Hadean enriched reservoir, complementary to the depleted reservoir in Isua, is recorded in 3.4-Gyr-old mafic dykes intruding into the Early Archaean rocks. Five out of seven dykes carry 142Nd deficits compared to the terrestrial Nd standard, with three samples yielding resolvable deficits down to −10.6 parts per million. The enriched component that we report here could have been a mantle reservoir that differentiated owing to the crystallization of a magma ocean, or could represent a mafic proto-crust that separated from the mantle more than 4.47 Gyr ago. Our results testify to the existence of an enriched component in the Hadean, and may suggest that the southwest Greenland mantle preserved early-formed heterogeneities until at least 3.4 Gyr ago. Article in Journal/Newspaper Greenland Université de Lyon: HAL Nature 491 7422 96 100 |
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Open Polar |
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Université de Lyon: HAL |
op_collection_id |
ftunivlyon |
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 Rizo, Hanika Boyet, Maud Blichert-Toft, Janne O'Neil, Jonathan Rosing, Minik T. Paquette, Jean-Louis The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The first indisputable evidence for very early differentiation of the silicate Earth came from the extinct 146Sm-142Nd chronometer. 142Nd excesses measured in 3.7-billion-year (Gyr)-old rocks from Isua1, 2 (southwest Greenland) relative to modern terrestrial samples imply their derivation from a depleted mantle formed in the Hadean eon (about 4,570-4,000 Gyr ago). As dictated by mass balance, the differentiation event responsible for the formation of the Isua early-depleted reservoir must also have formed a complementary enriched component. However, considerable efforts to find early-enriched mantle components in Isua have so far been unsuccessful3, 4, 5, 6, 7. Here we show that the signature of the Hadean enriched reservoir, complementary to the depleted reservoir in Isua, is recorded in 3.4-Gyr-old mafic dykes intruding into the Early Archaean rocks. Five out of seven dykes carry 142Nd deficits compared to the terrestrial Nd standard, with three samples yielding resolvable deficits down to −10.6 parts per million. The enriched component that we report here could have been a mantle reservoir that differentiated owing to the crystallization of a magma ocean, or could represent a mafic proto-crust that separated from the mantle more than 4.47 Gyr ago. Our results testify to the existence of an enriched component in the Hadean, and may suggest that the southwest Greenland mantle preserved early-formed heterogeneities until at least 3.4 Gyr ago. |
author2 |
Laboratoire Magmas et Volcans (LMV) Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Natural History Museum of Denmark Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) ANR-10-LABX-0006,CLERVOLC,Clermont-Ferrand centre for research on volcanism(2010) |
format |
Article in Journal/Newspaper |
author |
Rizo, Hanika Boyet, Maud Blichert-Toft, Janne O'Neil, Jonathan Rosing, Minik T. Paquette, Jean-Louis |
author_facet |
Rizo, Hanika Boyet, Maud Blichert-Toft, Janne O'Neil, Jonathan Rosing, Minik T. Paquette, Jean-Louis |
author_sort |
Rizo, Hanika |
title |
The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks |
title_short |
The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks |
title_full |
The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks |
title_fullStr |
The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks |
title_full_unstemmed |
The elusive Hadean enriched reservoir revealed by 142Nd deficits in Isua Archaean rocks |
title_sort |
elusive hadean enriched reservoir revealed by 142nd deficits in isua archaean rocks |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00801572 https://doi.org/10.1038/nature11565 |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-00801572 Nature, 2012, 491, pp.96-100. ⟨10.1038/nature11565⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/nature11565 hal-00801572 https://hal.science/hal-00801572 doi:10.1038/nature11565 |
op_doi |
https://doi.org/10.1038/nature11565 |
container_title |
Nature |
container_volume |
491 |
container_issue |
7422 |
container_start_page |
96 |
op_container_end_page |
100 |
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1810447089829675008 |