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Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites
The diamond potential of kimberlites is difficult to assess due to several mantle and magmatic processes affecting diamond content. Traditionally, initial evaluations are based on the compositions of mantle-derived minerals (garnet, chromite, clinopyroxene), which allow an assessment of pressure-tem...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10622582/ https://www.ncbi.nlm.nih.gov/pubmed/37919292 http://dx.doi.org/10.1038/s41467-023-42888-x |
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author | Giuliani, Andrea Phillips, David Pearson, D. Graham Sarkar, Soumendu Müller, Alex A. Weiss, Yaakov Preston, Robin Seller, Michael Spetsius, Zdislav |
author_facet | Giuliani, Andrea Phillips, David Pearson, D. Graham Sarkar, Soumendu Müller, Alex A. Weiss, Yaakov Preston, Robin Seller, Michael Spetsius, Zdislav |
author_sort | Giuliani, Andrea |
collection | PubMed |
description | The diamond potential of kimberlites is difficult to assess due to several mantle and magmatic processes affecting diamond content. Traditionally, initial evaluations are based on the compositions of mantle-derived minerals (garnet, chromite, clinopyroxene), which allow an assessment of pressure-temperature conditions and lithologies suitable for diamond formation. Here we explore a complementary approach that considers the conditions of diamonds destruction by interaction with melts/fluids (metasomatism). We test the hypothesis that carbonate-rich metasomatism related to kimberlite melt infiltration into the deep lithosphere is detrimental to diamond preservation. Our results show that high diamond grades in kimberlites worldwide are exclusively associated with high-Mg/Fe olivine, which corresponds to mantle lithosphere minimally affected by kimberlite-related metasomatism. Diamond dissolution in strongly metasomatised lithosphere containing low-Mg/Fe olivine provides a causal link to the empirical associations between low diamond grades, abundant Ti-Zr-rich garnets and kimberlites with high Ti and low Mg contents. This finding show-cases olivine geochemistry as a viable tool in diamond exploration. |
format | Online Article Text |
id | pubmed-10622582 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-106225822023-11-04 Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites Giuliani, Andrea Phillips, David Pearson, D. Graham Sarkar, Soumendu Müller, Alex A. Weiss, Yaakov Preston, Robin Seller, Michael Spetsius, Zdislav Nat Commun Article The diamond potential of kimberlites is difficult to assess due to several mantle and magmatic processes affecting diamond content. Traditionally, initial evaluations are based on the compositions of mantle-derived minerals (garnet, chromite, clinopyroxene), which allow an assessment of pressure-temperature conditions and lithologies suitable for diamond formation. Here we explore a complementary approach that considers the conditions of diamonds destruction by interaction with melts/fluids (metasomatism). We test the hypothesis that carbonate-rich metasomatism related to kimberlite melt infiltration into the deep lithosphere is detrimental to diamond preservation. Our results show that high diamond grades in kimberlites worldwide are exclusively associated with high-Mg/Fe olivine, which corresponds to mantle lithosphere minimally affected by kimberlite-related metasomatism. Diamond dissolution in strongly metasomatised lithosphere containing low-Mg/Fe olivine provides a causal link to the empirical associations between low diamond grades, abundant Ti-Zr-rich garnets and kimberlites with high Ti and low Mg contents. This finding show-cases olivine geochemistry as a viable tool in diamond exploration. Nature Publishing Group UK 2023-11-02 /pmc/articles/PMC10622582/ /pubmed/37919292 http://dx.doi.org/10.1038/s41467-023-42888-x Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Giuliani, Andrea Phillips, David Pearson, D. Graham Sarkar, Soumendu Müller, Alex A. Weiss, Yaakov Preston, Robin Seller, Michael Spetsius, Zdislav Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites |
title | Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites |
title_full | Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites |
title_fullStr | Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites |
title_full_unstemmed | Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites |
title_short | Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites |
title_sort | diamond preservation in the lithospheric mantle recorded by olivine in kimberlites |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10622582/ https://www.ncbi.nlm.nih.gov/pubmed/37919292 http://dx.doi.org/10.1038/s41467-023-42888-x |
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