Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust
International audience Primordial silicate differentiation controlled the composition of Earth's oldest crust. Inherited Nd-142 anomalies in Archean rocks are vestiges of the mantle-crust differentiation before ca. 4300 Ma. Here we report new whole-rock Sm-147,Sm-146-Nd-143,Nd-142 data for the...
Published in: | Geochemistry, Geophysics, Geosystems |
---|---|
Main Authors: | , , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
|
Subjects: | |
Online Access: | https://hal.science/hal-02110388 https://hal.science/hal-02110388/document https://hal.science/hal-02110388/file/Geochem%20Geophys%20Geosyst%20-%202014%20-%20Roth%20-%20Combined147%20146Sm%25u2010143%20142Nd%20constraints%20on%20the%20longevity%20and%20residence%20time%20of.pdf https://doi.org/10.1002/2014GC005313 |
id |
ftunivstetienne:oai:HAL:hal-02110388v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Université Jean Monnet – Saint-Etienne: HAL |
op_collection_id |
ftunivstetienne |
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 Roth, Antoine Bourdon, Bernard Mojzsis, Stephen Rudge, John Guitreau, Martin Blichert-Toft, Janne Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Primordial silicate differentiation controlled the composition of Earth's oldest crust. Inherited Nd-142 anomalies in Archean rocks are vestiges of the mantle-crust differentiation before ca. 4300 Ma. Here we report new whole-rock Sm-147,Sm-146-Nd-143,Nd-142 data for the Acasta Gneiss Complex (AGC; Northwest Territories, Canada). Our Sm-147-Nd-143 data combined with literature data define an age of 3371 +/- 141 Ma (2 SD) and yield an initial epsilon Nd-143 of -5.6 +/- 2.1. These results are at odds with the Acasta zircon U-Pb record, which comprises emplacement ages of 3920-3960 Ma. Ten of our thirteen samples show Nd-142 deficits of -9.6 +/- 4.8 ppm (2 SD) relative to the modern Earth. The discrepancy between Nd-142 anomalies and a mid-Archean Sm-147-Nd-143 age can be reconciled with Nd isotope reequilibration of the AGC during metamorphic perturbations at ca. 3400 Ma. A model age of ca. 4310 Ma is derived for the early enrichment of the Acasta source. Two compositional end-members can be identified: a felsic component with Nd-142/Nd-144 identical to the modern Earth and a mafic component with Nd-142/Nd-144 as low as -14.1 ppm. The ca. 4310 Ma AGC source is similar to 200 Myr younger than those estimated for Nuvvuagittuq (northern Quebec) and Isua (Itsaq Gneiss Complex, West Greenland). The AGC does not have the same decoupled Nd-Hf isotope systematics as these other two terranes, which have been attributed to the crystallization of an early magma ocean. The Acasta signature rather is ascribed to the formation of Hadean crust that was preserved for several hundred Myr. Its longevity can be linked to Nd-142 evolution in the mantle and does not require slow mantle stirring times nor modification of its convective mode. |
author2 |
Institute of Geochemistry and Petrology ETH Zürich Department of Earth Sciences Swiss Federal Institute of Technology - ETH Zürich (D-ERDW) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)-Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) 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) Laboratoire de Sciences de la Terre (LST) 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 |
Roth, Antoine Bourdon, Bernard Mojzsis, Stephen Rudge, John Guitreau, Martin Blichert-Toft, Janne |
author_facet |
Roth, Antoine Bourdon, Bernard Mojzsis, Stephen Rudge, John Guitreau, Martin Blichert-Toft, Janne |
author_sort |
Roth, Antoine |
title |
Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust |
title_short |
Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust |
title_full |
Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust |
title_fullStr |
Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust |
title_full_unstemmed |
Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust |
title_sort |
combined 147,146 sm- 143,142 nd constraints on the longevity and residence time of early terrestrial crust |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-02110388 https://hal.science/hal-02110388/document https://hal.science/hal-02110388/file/Geochem%20Geophys%20Geosyst%20-%202014%20-%20Roth%20-%20Combined147%20146Sm%25u2010143%20142Nd%20constraints%20on%20the%20longevity%20and%20residence%20time%20of.pdf https://doi.org/10.1002/2014GC005313 |
genre |
Greenland Northwest Territories |
genre_facet |
Greenland Northwest Territories |
op_source |
EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-02110388 Geochemistry, Geophysics, Geosystems, 2014, 15 (6), pp.2329-2345. ⟨10.1002/2014GC005313⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GC005313 hal-02110388 https://hal.science/hal-02110388 https://hal.science/hal-02110388/document https://hal.science/hal-02110388/file/Geochem%20Geophys%20Geosyst%20-%202014%20-%20Roth%20-%20Combined147%20146Sm%25u2010143%20142Nd%20constraints%20on%20the%20longevity%20and%20residence%20time%20of.pdf doi:10.1002/2014GC005313 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2014GC005313 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
15 |
container_issue |
6 |
container_start_page |
2329 |
op_container_end_page |
2345 |
_version_ |
1810447689669672960 |
spelling |
ftunivstetienne:oai:HAL:hal-02110388v1 2024-09-15T18:10:05+00:00 Combined 147,146 Sm- 143,142 Nd constraints on the longevity and residence time of early terrestrial crust Roth, Antoine Bourdon, Bernard Mojzsis, Stephen Rudge, John Guitreau, Martin Blichert-Toft, Janne Institute of Geochemistry and Petrology ETH Zürich Department of Earth Sciences Swiss Federal Institute of Technology - ETH Zürich (D-ERDW) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)-Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) 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) Laboratoire de Sciences de la Terre (LST) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2014-06 https://hal.science/hal-02110388 https://hal.science/hal-02110388/document https://hal.science/hal-02110388/file/Geochem%20Geophys%20Geosyst%20-%202014%20-%20Roth%20-%20Combined147%20146Sm%25u2010143%20142Nd%20constraints%20on%20the%20longevity%20and%20residence%20time%20of.pdf https://doi.org/10.1002/2014GC005313 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GC005313 hal-02110388 https://hal.science/hal-02110388 https://hal.science/hal-02110388/document https://hal.science/hal-02110388/file/Geochem%20Geophys%20Geosyst%20-%202014%20-%20Roth%20-%20Combined147%20146Sm%25u2010143%20142Nd%20constraints%20on%20the%20longevity%20and%20residence%20time%20of.pdf doi:10.1002/2014GC005313 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-02110388 Geochemistry, Geophysics, Geosystems, 2014, 15 (6), pp.2329-2345. ⟨10.1002/2014GC005313⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2014 ftunivstetienne https://doi.org/10.1002/2014GC005313 2024-07-22T23:40:58Z International audience Primordial silicate differentiation controlled the composition of Earth's oldest crust. Inherited Nd-142 anomalies in Archean rocks are vestiges of the mantle-crust differentiation before ca. 4300 Ma. Here we report new whole-rock Sm-147,Sm-146-Nd-143,Nd-142 data for the Acasta Gneiss Complex (AGC; Northwest Territories, Canada). Our Sm-147-Nd-143 data combined with literature data define an age of 3371 +/- 141 Ma (2 SD) and yield an initial epsilon Nd-143 of -5.6 +/- 2.1. These results are at odds with the Acasta zircon U-Pb record, which comprises emplacement ages of 3920-3960 Ma. Ten of our thirteen samples show Nd-142 deficits of -9.6 +/- 4.8 ppm (2 SD) relative to the modern Earth. The discrepancy between Nd-142 anomalies and a mid-Archean Sm-147-Nd-143 age can be reconciled with Nd isotope reequilibration of the AGC during metamorphic perturbations at ca. 3400 Ma. A model age of ca. 4310 Ma is derived for the early enrichment of the Acasta source. Two compositional end-members can be identified: a felsic component with Nd-142/Nd-144 identical to the modern Earth and a mafic component with Nd-142/Nd-144 as low as -14.1 ppm. The ca. 4310 Ma AGC source is similar to 200 Myr younger than those estimated for Nuvvuagittuq (northern Quebec) and Isua (Itsaq Gneiss Complex, West Greenland). The AGC does not have the same decoupled Nd-Hf isotope systematics as these other two terranes, which have been attributed to the crystallization of an early magma ocean. The Acasta signature rather is ascribed to the formation of Hadean crust that was preserved for several hundred Myr. Its longevity can be linked to Nd-142 evolution in the mantle and does not require slow mantle stirring times nor modification of its convective mode. Article in Journal/Newspaper Greenland Northwest Territories Université Jean Monnet – Saint-Etienne: HAL Geochemistry, Geophysics, Geosystems 15 6 2329 2345 |