Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland
International audience The composition and evolution of the silicate Earth during Hadean/Eoarchean times are widely debated and largely unknown due to the sparse geological record preserved from Earthʼs infancy. The short-lived 146Sm-142Nd chronometer applied to 3.8-3.7 Ga old mantle-derived amphibo...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://doi.org/10.1016/j.epsl.2013.07.012 https://hal.archives-ouvertes.fr/hal-01061286 |
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fttriple:oai:gotriple.eu:10670/1.zrg6lk 2023-05-15T16:27:45+02:00 Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland Rizo, Hanika Boyet, Maud Blichert-Toft, Janne Rosing, Minik Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet Saint-Étienne (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-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)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon) Natural History Museum of Denmark Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU) 2013-01-01 https://doi.org/10.1016/j.epsl.2013.07.012 https://hal.archives-ouvertes.fr/hal-01061286 en eng HAL CCSD Elsevier hal-01061286 doi:10.1016/j.epsl.2013.07.012 10670/1.zrg6lk https://hal.archives-ouvertes.fr/hal-01061286 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0012-821X Earth and Planetary Science Letters Earth and Planetary Science Letters, Elsevier, 2013, 377-378, pp.324-335. ⟨10.1016/j.epsl.2013.07.012⟩ 142Nd Hadean Archean mantle dynamics Isua Supracrustal Belt geo hist Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.1016/j.epsl.2013.07.012 2023-01-22T17:06:05Z International audience The composition and evolution of the silicate Earth during Hadean/Eoarchean times are widely debated and largely unknown due to the sparse geological record preserved from Earthʼs infancy. The short-lived 146Sm-142Nd chronometer applied to 3.8-3.7 Ga old mantle-derived amphibolites from the Isua Supracrustal Belt (ISB) in southwest Greenland has revealed ubiquitous 142Nd excesses in these rocks compared to modern samples and terrestrial Nd standards. Because the parent isotope, 146Sm, was extant only during the first few hundred million years of Solar System history, this implies derivation of the Greenland samples from a source formed in the Hadean. This mantle source is the oldest yet identified on Earth and therefore provides key information about the nature and evolution of early-differentiated reservoirs. In contrast, modern mantle-derived rocks from around the world do not have 142Nd anomalies, suggesting that the primordial heterogeneities detected in Earthʼs early mantle have been erased over time. In order to better constrain the rate at which early mantle heterogeneities have been re-homogenized, we produced new 146Sm-142Nd data for both 3.8 and 3.3 Ga old mafic rocks from different tectonic domains of the ISB, accompanied by their corresponding 147Sm-143Nd and 176Lu-176Hf systematics. The 3.8 Ga suite yields 142Nd excesses comparable to those detected previously in 3.7 Ga old ISB amphibolites, indicating that Eoarchean mafic ISB lavas originated from sources with similar differentiation histories despite being from different juxtaposed tectonic segments. Conversely, 3.3 Ga old amphibolites from the ISB do not show resolvable 142Nd anomalies compared to terrestrial Nd standards. Since Rizo et al. (2012) reported 142Nd anomalies in 3.4 Ga old ISB samples, the present data suggest that the primordial 142Nd heterogeneities in the Isua mantle disappeared between 3.4 and 3.3 Ga. The present data set consists of samples from a unique location where 500 million years of history of the ... Article in Journal/Newspaper Greenland Unknown Greenland Earth and Planetary Science Letters 377-378 324 335 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
142Nd Hadean Archean mantle dynamics Isua Supracrustal Belt geo hist |
spellingShingle |
142Nd Hadean Archean mantle dynamics Isua Supracrustal Belt geo hist Rizo, Hanika Boyet, Maud Blichert-Toft, Janne Rosing, Minik Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland |
topic_facet |
142Nd Hadean Archean mantle dynamics Isua Supracrustal Belt geo hist |
description |
International audience The composition and evolution of the silicate Earth during Hadean/Eoarchean times are widely debated and largely unknown due to the sparse geological record preserved from Earthʼs infancy. The short-lived 146Sm-142Nd chronometer applied to 3.8-3.7 Ga old mantle-derived amphibolites from the Isua Supracrustal Belt (ISB) in southwest Greenland has revealed ubiquitous 142Nd excesses in these rocks compared to modern samples and terrestrial Nd standards. Because the parent isotope, 146Sm, was extant only during the first few hundred million years of Solar System history, this implies derivation of the Greenland samples from a source formed in the Hadean. This mantle source is the oldest yet identified on Earth and therefore provides key information about the nature and evolution of early-differentiated reservoirs. In contrast, modern mantle-derived rocks from around the world do not have 142Nd anomalies, suggesting that the primordial heterogeneities detected in Earthʼs early mantle have been erased over time. In order to better constrain the rate at which early mantle heterogeneities have been re-homogenized, we produced new 146Sm-142Nd data for both 3.8 and 3.3 Ga old mafic rocks from different tectonic domains of the ISB, accompanied by their corresponding 147Sm-143Nd and 176Lu-176Hf systematics. The 3.8 Ga suite yields 142Nd excesses comparable to those detected previously in 3.7 Ga old ISB amphibolites, indicating that Eoarchean mafic ISB lavas originated from sources with similar differentiation histories despite being from different juxtaposed tectonic segments. Conversely, 3.3 Ga old amphibolites from the ISB do not show resolvable 142Nd anomalies compared to terrestrial Nd standards. Since Rizo et al. (2012) reported 142Nd anomalies in 3.4 Ga old ISB samples, the present data suggest that the primordial 142Nd heterogeneities in the Isua mantle disappeared between 3.4 and 3.3 Ga. The present data set consists of samples from a unique location where 500 million years of history of the ... |
author2 |
Laboratoire Magmas et Volcans (LMV) Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet Saint-Étienne (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-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)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon) Natural History Museum of Denmark Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU) |
format |
Article in Journal/Newspaper |
author |
Rizo, Hanika Boyet, Maud Blichert-Toft, Janne Rosing, Minik |
author_facet |
Rizo, Hanika Boyet, Maud Blichert-Toft, Janne Rosing, Minik |
author_sort |
Rizo, Hanika |
title |
Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland |
title_short |
Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland |
title_full |
Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland |
title_fullStr |
Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland |
title_full_unstemmed |
Early mantle dynamics inferred from 142Nd variations in Archean rocks from southwest Greenland |
title_sort |
early mantle dynamics inferred from 142nd variations in archean rocks from southwest greenland |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://doi.org/10.1016/j.epsl.2013.07.012 https://hal.archives-ouvertes.fr/hal-01061286 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0012-821X Earth and Planetary Science Letters Earth and Planetary Science Letters, Elsevier, 2013, 377-378, pp.324-335. ⟨10.1016/j.epsl.2013.07.012⟩ |
op_relation |
hal-01061286 doi:10.1016/j.epsl.2013.07.012 10670/1.zrg6lk https://hal.archives-ouvertes.fr/hal-01061286 |
op_rights |
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op_doi |
https://doi.org/10.1016/j.epsl.2013.07.012 |
container_title |
Earth and Planetary Science Letters |
container_volume |
377-378 |
container_start_page |
324 |
op_container_end_page |
335 |
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1766017274791067648 |