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Calcium isotopic evidence for the mantle sources of carbonatites
The origin of carbonatites—igneous rocks with more than 50% of carbonate minerals—and whether they originate from a primary mantle source or from recycling of surface materials are still debated. Calcium isotopes have the potential to resolve the origin of carbonatites, since marine carbonates are e...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7269651/ https://www.ncbi.nlm.nih.gov/pubmed/32537505 http://dx.doi.org/10.1126/sciadv.aba3269 |
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author | Amsellem, Elsa Moynier, Frédéric Bertrand, Hervé Bouyon, Amaury Mata, João Tappe, Sebastian Day, James M. D. |
author_facet | Amsellem, Elsa Moynier, Frédéric Bertrand, Hervé Bouyon, Amaury Mata, João Tappe, Sebastian Day, James M. D. |
author_sort | Amsellem, Elsa |
collection | PubMed |
description | The origin of carbonatites—igneous rocks with more than 50% of carbonate minerals—and whether they originate from a primary mantle source or from recycling of surface materials are still debated. Calcium isotopes have the potential to resolve the origin of carbonatites, since marine carbonates are enriched in the lighter isotopes of Ca compared to the mantle. Here, we report the Ca isotopic compositions for 74 carbonatites and associated silicate rocks from continental and oceanic settings, spanning from 3 billion years ago to the present day, together with O and C isotopic ratios for 37 samples. Calcium-, Mg-, and Fe-rich carbonatites have isotopically lighter Ca than mantle-derived rocks such as basalts and fall within the range of isotopically light Ca from ancient marine carbonates. This signature reflects the composition of the source, which is isotopically light and is consistent with recycling of surface carbonate materials into the mantle. |
format | Online Article Text |
id | pubmed-7269651 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-72696512020-06-11 Calcium isotopic evidence for the mantle sources of carbonatites Amsellem, Elsa Moynier, Frédéric Bertrand, Hervé Bouyon, Amaury Mata, João Tappe, Sebastian Day, James M. D. Sci Adv Research Articles The origin of carbonatites—igneous rocks with more than 50% of carbonate minerals—and whether they originate from a primary mantle source or from recycling of surface materials are still debated. Calcium isotopes have the potential to resolve the origin of carbonatites, since marine carbonates are enriched in the lighter isotopes of Ca compared to the mantle. Here, we report the Ca isotopic compositions for 74 carbonatites and associated silicate rocks from continental and oceanic settings, spanning from 3 billion years ago to the present day, together with O and C isotopic ratios for 37 samples. Calcium-, Mg-, and Fe-rich carbonatites have isotopically lighter Ca than mantle-derived rocks such as basalts and fall within the range of isotopically light Ca from ancient marine carbonates. This signature reflects the composition of the source, which is isotopically light and is consistent with recycling of surface carbonate materials into the mantle. American Association for the Advancement of Science 2020-06-03 /pmc/articles/PMC7269651/ /pubmed/32537505 http://dx.doi.org/10.1126/sciadv.aba3269 Text en Copyright © 2020 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 NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Amsellem, Elsa Moynier, Frédéric Bertrand, Hervé Bouyon, Amaury Mata, João Tappe, Sebastian Day, James M. D. Calcium isotopic evidence for the mantle sources of carbonatites |
title | Calcium isotopic evidence for the mantle sources of carbonatites |
title_full | Calcium isotopic evidence for the mantle sources of carbonatites |
title_fullStr | Calcium isotopic evidence for the mantle sources of carbonatites |
title_full_unstemmed | Calcium isotopic evidence for the mantle sources of carbonatites |
title_short | Calcium isotopic evidence for the mantle sources of carbonatites |
title_sort | calcium isotopic evidence for the mantle sources of carbonatites |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7269651/ https://www.ncbi.nlm.nih.gov/pubmed/32537505 http://dx.doi.org/10.1126/sciadv.aba3269 |
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