Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland
Archean rocks may provide a record of early Earth environments. However, such rocks have often been metamorphosed by high pressure and temperature, which can overprint the signatures of their original formation. Here, we show that the early Archean banded rocks from Isua, Akilia, and Innersuartuut,...
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craaas:10.1126/science.1104639 2024-06-23T07:53:15+00:00 Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland Dauphas, Nicolas van Zuilen, Mark Wadhwa, Meenakshi Davis, Andrew M. Marty, Bernard Janney, Philip E. 2004 http://dx.doi.org/10.1126/science.1104639 https://www.science.org/doi/pdf/10.1126/science.1104639 en eng American Association for the Advancement of Science (AAAS) Science volume 306, issue 5704, page 2077-2080 ISSN 0036-8075 1095-9203 journal-article 2004 craaas https://doi.org/10.1126/science.1104639 2024-06-06T04:01:30Z Archean rocks may provide a record of early Earth environments. However, such rocks have often been metamorphosed by high pressure and temperature, which can overprint the signatures of their original formation. Here, we show that the early Archean banded rocks from Isua, Akilia, and Innersuartuut, Greenland, are enriched in heavy iron isotopes by 0.1 to 0.5 per mil per atomic mass unit relative to igneous rocks worldwide. The observed enrichments are compatible with the transport, oxidation, and subsequent precipitation of ferrous iron emanating from hydrothermal vents and thus suggest that the original rocks were banded iron formations (BIFs). These variations therefore support a sedimentary origin for the Akilia banded rocks, which represent one of the oldest known occurrences of water-laid deposits on Earth. Article in Journal/Newspaper Greenland AAAS Resource Center (American Association for the Advancement of Science) Greenland Science 306 5704 2077 2080 |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
Archean rocks may provide a record of early Earth environments. However, such rocks have often been metamorphosed by high pressure and temperature, which can overprint the signatures of their original formation. Here, we show that the early Archean banded rocks from Isua, Akilia, and Innersuartuut, Greenland, are enriched in heavy iron isotopes by 0.1 to 0.5 per mil per atomic mass unit relative to igneous rocks worldwide. The observed enrichments are compatible with the transport, oxidation, and subsequent precipitation of ferrous iron emanating from hydrothermal vents and thus suggest that the original rocks were banded iron formations (BIFs). These variations therefore support a sedimentary origin for the Akilia banded rocks, which represent one of the oldest known occurrences of water-laid deposits on Earth. |
format |
Article in Journal/Newspaper |
author |
Dauphas, Nicolas van Zuilen, Mark Wadhwa, Meenakshi Davis, Andrew M. Marty, Bernard Janney, Philip E. |
spellingShingle |
Dauphas, Nicolas van Zuilen, Mark Wadhwa, Meenakshi Davis, Andrew M. Marty, Bernard Janney, Philip E. Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland |
author_facet |
Dauphas, Nicolas van Zuilen, Mark Wadhwa, Meenakshi Davis, Andrew M. Marty, Bernard Janney, Philip E. |
author_sort |
Dauphas, Nicolas |
title |
Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland |
title_short |
Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland |
title_full |
Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland |
title_fullStr |
Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland |
title_full_unstemmed |
Clues from Fe Isotope Variations on the Origin of Early Archean BIFs from Greenland |
title_sort |
clues from fe isotope variations on the origin of early archean bifs from greenland |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1126/science.1104639 https://www.science.org/doi/pdf/10.1126/science.1104639 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Science volume 306, issue 5704, page 2077-2080 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1104639 |
container_title |
Science |
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306 |
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5704 |
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2077 |
op_container_end_page |
2080 |
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1802644815590981632 |