Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia)
Diamonds and their inclusions are unique fragments of deep Earth, which provide rare samples from inaccessible portions of our planet. Inclusion-free diamonds cannot provide information on depth of formation, which could be crucial to understand how the carbon cycle operated in the past. Inclusions...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6715805/ https://www.ncbi.nlm.nih.gov/pubmed/31467318 http://dx.doi.org/10.1038/s41598-019-48778-x |
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author | Nestola, Fabrizio Zaffiro, Gabriele Mazzucchelli, Mattia L. Nimis, Paolo Andreozzi, Giovanni B. Periotto, Benedetta Princivalle, Francesco Lenaz, Davide Secco, Luciano Pasqualetto, Leonardo Logvinova, Alla M. Sobolev, Nikolay V. Lorenzetti, Alessandra Harris, Jeffrey W. |
author_facet | Nestola, Fabrizio Zaffiro, Gabriele Mazzucchelli, Mattia L. Nimis, Paolo Andreozzi, Giovanni B. Periotto, Benedetta Princivalle, Francesco Lenaz, Davide Secco, Luciano Pasqualetto, Leonardo Logvinova, Alla M. Sobolev, Nikolay V. Lorenzetti, Alessandra Harris, Jeffrey W. |
author_sort | Nestola, Fabrizio |
collection | PubMed |
description | Diamonds and their inclusions are unique fragments of deep Earth, which provide rare samples from inaccessible portions of our planet. Inclusion-free diamonds cannot provide information on depth of formation, which could be crucial to understand how the carbon cycle operated in the past. Inclusions in diamonds, which remain uncorrupted over geological times, may instead provide direct records of deep Earth’s evolution. Here, we applied elastic geothermobarometry to a diamond-magnesiochromite (mchr) host-inclusion pair from the Udachnaya kimberlite (Siberia, Russia), one of the most important sources of natural diamonds. By combining X-ray diffraction and Fourier-transform infrared spectroscopy data with a new elastic model, we obtained entrapment conditions, P(trap) = 6.5(2) GPa and T(trap) = 1125(32)–1140(33) °C, for the mchr inclusion. These conditions fall on a ca. 35 mW/m(2) geotherm and are colder than the great majority of mantle xenoliths from similar depth in the same kimberlite. Our results indicate that cold cratonic conditions persisted for billions of years to at least 200 km in the local lithosphere. The composition of the mchr also indicates that at this depth the lithosphere was, at least locally, ultra-depleted at the time of diamond formation, as opposed to the melt-metasomatized, enriched composition of most xenoliths. |
format | Online Article Text |
id | pubmed-6715805 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-67158052019-09-13 Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia) Nestola, Fabrizio Zaffiro, Gabriele Mazzucchelli, Mattia L. Nimis, Paolo Andreozzi, Giovanni B. Periotto, Benedetta Princivalle, Francesco Lenaz, Davide Secco, Luciano Pasqualetto, Leonardo Logvinova, Alla M. Sobolev, Nikolay V. Lorenzetti, Alessandra Harris, Jeffrey W. Sci Rep Article Diamonds and their inclusions are unique fragments of deep Earth, which provide rare samples from inaccessible portions of our planet. Inclusion-free diamonds cannot provide information on depth of formation, which could be crucial to understand how the carbon cycle operated in the past. Inclusions in diamonds, which remain uncorrupted over geological times, may instead provide direct records of deep Earth’s evolution. Here, we applied elastic geothermobarometry to a diamond-magnesiochromite (mchr) host-inclusion pair from the Udachnaya kimberlite (Siberia, Russia), one of the most important sources of natural diamonds. By combining X-ray diffraction and Fourier-transform infrared spectroscopy data with a new elastic model, we obtained entrapment conditions, P(trap) = 6.5(2) GPa and T(trap) = 1125(32)–1140(33) °C, for the mchr inclusion. These conditions fall on a ca. 35 mW/m(2) geotherm and are colder than the great majority of mantle xenoliths from similar depth in the same kimberlite. Our results indicate that cold cratonic conditions persisted for billions of years to at least 200 km in the local lithosphere. The composition of the mchr also indicates that at this depth the lithosphere was, at least locally, ultra-depleted at the time of diamond formation, as opposed to the melt-metasomatized, enriched composition of most xenoliths. Nature Publishing Group UK 2019-08-29 /pmc/articles/PMC6715805/ /pubmed/31467318 http://dx.doi.org/10.1038/s41598-019-48778-x Text en © The Author(s) 2019 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/. |
spellingShingle | Article Nestola, Fabrizio Zaffiro, Gabriele Mazzucchelli, Mattia L. Nimis, Paolo Andreozzi, Giovanni B. Periotto, Benedetta Princivalle, Francesco Lenaz, Davide Secco, Luciano Pasqualetto, Leonardo Logvinova, Alla M. Sobolev, Nikolay V. Lorenzetti, Alessandra Harris, Jeffrey W. Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia) |
title | Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia) |
title_full | Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia) |
title_fullStr | Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia) |
title_full_unstemmed | Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia) |
title_short | Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia) |
title_sort | diamond-inclusion system recording old deep lithosphere conditions at udachnaya (siberia) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6715805/ https://www.ncbi.nlm.nih.gov/pubmed/31467318 http://dx.doi.org/10.1038/s41598-019-48778-x |
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