Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle
The differentiation of Earth ~4.5 billion years (Ga) ago is believed to have culminated in magma ocean crystallization, crystal-liquid separation, and the formation of mineralogically distinct mantle reservoirs. However, the magma ocean model remains difficult to validate because of the scarcity of...
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ftpubmed:oai:pubmedcentral.nih.gov:7954453 2023-05-15T16:29:04+02:00 Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle Williams, Helen M. Matthews, Simon Rizo, Hanika Shorttle, Oliver 2021-03-12 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7954453/ http://www.ncbi.nlm.nih.gov/pubmed/33712459 https://doi.org/10.1126/sciadv.abc7394 en eng American Association for the Advancement of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7954453/ http://www.ncbi.nlm.nih.gov/pubmed/33712459 http://dx.doi.org/10.1126/sciadv.abc7394 Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Sci Adv Research Articles Text 2021 ftpubmed https://doi.org/10.1126/sciadv.abc7394 2021-03-28T01:24:15Z The differentiation of Earth ~4.5 billion years (Ga) ago is believed to have culminated in magma ocean crystallization, crystal-liquid separation, and the formation of mineralogically distinct mantle reservoirs. However, the magma ocean model remains difficult to validate because of the scarcity of geochemical tracers of lower mantle mineralogy. The Fe isotope compositions (δ(57)Fe) of ancient mafic rocks can be used to reconstruct the mineralogy of their mantle source regions. We present Fe isotope data for 3.7-Ga metabasalts from the Isua Supracrustal Belt (Greenland). The δ(57)Fe signatures of these samples extend to values elevated relative to modern equivalents and define strong correlations with fluid-immobile trace elements and tungsten isotope anomalies (μ(182)W). Phase equilibria models demonstrate that these features can be explained by melting of a magma ocean cumulate component in the upper mantle. Similar processes may operate today, as evidenced by the δ(57)Fe and μ(182)W heterogeneity of modern oceanic basalts. Text Greenland PubMed Central (PMC) Greenland Science Advances 7 11 eabc7394 |
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Research Articles Williams, Helen M. Matthews, Simon Rizo, Hanika Shorttle, Oliver Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle |
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Research Articles |
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The differentiation of Earth ~4.5 billion years (Ga) ago is believed to have culminated in magma ocean crystallization, crystal-liquid separation, and the formation of mineralogically distinct mantle reservoirs. However, the magma ocean model remains difficult to validate because of the scarcity of geochemical tracers of lower mantle mineralogy. The Fe isotope compositions (δ(57)Fe) of ancient mafic rocks can be used to reconstruct the mineralogy of their mantle source regions. We present Fe isotope data for 3.7-Ga metabasalts from the Isua Supracrustal Belt (Greenland). The δ(57)Fe signatures of these samples extend to values elevated relative to modern equivalents and define strong correlations with fluid-immobile trace elements and tungsten isotope anomalies (μ(182)W). Phase equilibria models demonstrate that these features can be explained by melting of a magma ocean cumulate component in the upper mantle. Similar processes may operate today, as evidenced by the δ(57)Fe and μ(182)W heterogeneity of modern oceanic basalts. |
format |
Text |
author |
Williams, Helen M. Matthews, Simon Rizo, Hanika Shorttle, Oliver |
author_facet |
Williams, Helen M. Matthews, Simon Rizo, Hanika Shorttle, Oliver |
author_sort |
Williams, Helen M. |
title |
Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle |
title_short |
Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle |
title_full |
Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle |
title_fullStr |
Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle |
title_full_unstemmed |
Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle |
title_sort |
iron isotopes trace primordial magma ocean cumulates melting in earth’s upper mantle |
publisher |
American Association for the Advancement of Science |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7954453/ http://www.ncbi.nlm.nih.gov/pubmed/33712459 https://doi.org/10.1126/sciadv.abc7394 |
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Greenland |
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Greenland |
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Greenland |
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Greenland |
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Sci Adv |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7954453/ http://www.ncbi.nlm.nih.gov/pubmed/33712459 http://dx.doi.org/10.1126/sciadv.abc7394 |
op_rights |
Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
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https://doi.org/10.1126/sciadv.abc7394 |
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