Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics
The oldest rocks—3.85 billion years old—from southwest Greenland have coupled neodymium-142 excesses (from decay of now-extinct samarium-146; half-life, 103 million years) and neodymium-143 excesses (from decay of samarium-147; half-life, 106 billion years), relative to chondritic meteorites, that d...
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craaas:10.1126/science.1145928 2024-10-20T14:09:04+00:00 Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics Bennett, Vickie C. Brandon, Alan D. Nutman, Allen P. 2007 http://dx.doi.org/10.1126/science.1145928 https://www.science.org/doi/pdf/10.1126/science.1145928 en eng American Association for the Advancement of Science (AAAS) Science volume 318, issue 5858, page 1907-1910 ISSN 0036-8075 1095-9203 journal-article 2007 craaas https://doi.org/10.1126/science.1145928 2024-10-10T04:00:43Z The oldest rocks—3.85 billion years old—from southwest Greenland have coupled neodymium-142 excesses (from decay of now-extinct samarium-146; half-life, 103 million years) and neodymium-143 excesses (from decay of samarium-147; half-life, 106 billion years), relative to chondritic meteorites, that directly date the formation of chemically distinct silicate reservoirs in the first 30 million to 75 million years of Earth history. The differences in 142 Nd signatures of coeval rocks from the two most extensive crustal relicts more than 3.6 billion years old, in Western Australia and southwest Greenland, reveal early-formed large-scale chemical heterogeneities in Earth's mantle that persisted for at least the first billion years of Earth history. Temporal variations in 142 Nd signatures track the subsequent incomplete remixing of very-early-formed mantle chemical domains. Article in Journal/Newspaper Greenland AAAS Resource Center (American Association for the Advancement of Science) Greenland Science 318 5858 1907 1910 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
The oldest rocks—3.85 billion years old—from southwest Greenland have coupled neodymium-142 excesses (from decay of now-extinct samarium-146; half-life, 103 million years) and neodymium-143 excesses (from decay of samarium-147; half-life, 106 billion years), relative to chondritic meteorites, that directly date the formation of chemically distinct silicate reservoirs in the first 30 million to 75 million years of Earth history. The differences in 142 Nd signatures of coeval rocks from the two most extensive crustal relicts more than 3.6 billion years old, in Western Australia and southwest Greenland, reveal early-formed large-scale chemical heterogeneities in Earth's mantle that persisted for at least the first billion years of Earth history. Temporal variations in 142 Nd signatures track the subsequent incomplete remixing of very-early-formed mantle chemical domains. |
format |
Article in Journal/Newspaper |
author |
Bennett, Vickie C. Brandon, Alan D. Nutman, Allen P. |
spellingShingle |
Bennett, Vickie C. Brandon, Alan D. Nutman, Allen P. Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics |
author_facet |
Bennett, Vickie C. Brandon, Alan D. Nutman, Allen P. |
author_sort |
Bennett, Vickie C. |
title |
Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics |
title_short |
Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics |
title_full |
Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics |
title_fullStr |
Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics |
title_full_unstemmed |
Coupled 142 Nd- 143 Nd Isotopic Evidence for Hadean Mantle Dynamics |
title_sort |
coupled 142 nd- 143 nd isotopic evidence for hadean mantle dynamics |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1126/science.1145928 https://www.science.org/doi/pdf/10.1126/science.1145928 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Science volume 318, issue 5858, page 1907-1910 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1145928 |
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Science |
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318 |
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5858 |
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1907 |
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1910 |
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1813448483237003264 |