Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ...
The differentiation of the Earth ~ 4.5 Ga 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 due to the scarcity of geochemical tracers...
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ftdatacite:10.17863/cam.66986 2024-02-04T10:00:51+01:00 Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ... Williams, Helen Matthews, Simon Rizo, Hanika Shorttle, O 2021 https://dx.doi.org/10.17863/cam.66986 https://www.repository.cam.ac.uk/handle/1810/319861 en eng American Association for the Advancement of Science open.access Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 http://purl.org/coar/access_right/c_abf2 37 Earth Sciences 3703 Geochemistry 3705 Geology 3706 Geophysics 14 Life Below Water Article ScholarlyArticle JournalArticle article-journal 2021 ftdatacite https://doi.org/10.17863/cam.66986 2024-01-05T10:13:11Z The differentiation of the Earth ~ 4.5 Ga 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 due to the scarcity of geochemical tracers of lower mantle mineralogy. The Fe isotope compositions (57Fe) 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 57Fe 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 (182W). 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 57Fe and 182W heterogeneity of modern oceanic basalts. ... Article in Journal/Newspaper Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
English |
topic |
37 Earth Sciences 3703 Geochemistry 3705 Geology 3706 Geophysics 14 Life Below Water |
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37 Earth Sciences 3703 Geochemistry 3705 Geology 3706 Geophysics 14 Life Below Water Williams, Helen Matthews, Simon Rizo, Hanika Shorttle, O Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ... |
topic_facet |
37 Earth Sciences 3703 Geochemistry 3705 Geology 3706 Geophysics 14 Life Below Water |
description |
The differentiation of the Earth ~ 4.5 Ga 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 due to the scarcity of geochemical tracers of lower mantle mineralogy. The Fe isotope compositions (57Fe) 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 57Fe 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 (182W). 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 57Fe and 182W heterogeneity of modern oceanic basalts. ... |
format |
Article in Journal/Newspaper |
author |
Williams, Helen Matthews, Simon Rizo, Hanika Shorttle, O |
author_facet |
Williams, Helen Matthews, Simon Rizo, Hanika Shorttle, O |
author_sort |
Williams, Helen |
title |
Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ... |
title_short |
Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ... |
title_full |
Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ... |
title_fullStr |
Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ... |
title_full_unstemmed |
Iron isotopes trace primordial magma ocean cumulates melting in the Earth’s upper mantle ... |
title_sort |
iron isotopes trace primordial magma ocean cumulates melting in the earth’s upper mantle ... |
publisher |
American Association for the Advancement of Science |
publishDate |
2021 |
url |
https://dx.doi.org/10.17863/cam.66986 https://www.repository.cam.ac.uk/handle/1810/319861 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_rights |
open.access Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.17863/cam.66986 |
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1789966349481541632 |