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Paleomagnetic techniques can date speleothems with high concentrations of detrital material

The U-series dating of young and ‘dirty’ speleothems is challenging due to difficulties in assessing the isotopic composition of detrital contaminants and the low-abundance of (230)Th generated in situ. Here we propose a new dating approach based on the comparison of a speleothem’s paleomagnetic dir...

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Autores principales: Sánchez-Moreno, Elisa M., Font, Eric, Pavón-Carrasco, F. Javier, Dimuccio, Luca A., Hillaire-Marcel, Claude, Ghaleb, Bassam, Cunha, Lúcio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9605962/
https://www.ncbi.nlm.nih.gov/pubmed/36289261
http://dx.doi.org/10.1038/s41598-022-21761-9
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author Sánchez-Moreno, Elisa M.
Font, Eric
Pavón-Carrasco, F. Javier
Dimuccio, Luca A.
Hillaire-Marcel, Claude
Ghaleb, Bassam
Cunha, Lúcio
author_facet Sánchez-Moreno, Elisa M.
Font, Eric
Pavón-Carrasco, F. Javier
Dimuccio, Luca A.
Hillaire-Marcel, Claude
Ghaleb, Bassam
Cunha, Lúcio
author_sort Sánchez-Moreno, Elisa M.
collection PubMed
description The U-series dating of young and ‘dirty’ speleothems is challenging due to difficulties in assessing the isotopic composition of detrital contaminants and the low-abundance of (230)Th generated in situ. Here we propose a new dating approach based on the comparison of a speleothem’s paleomagnetic directions to reference curves from global paleomagnetic reconstructions. This approach is demonstrated on a stalagmite collected from the Soprador do Carvalho cave in the Central Region of Portugal. A radioisotopic age model, built using four U-series ages and three (14)C, suggests relatively steady carbonate precipitation from ~ 5760 BCE until ~ 1920 CE. Forty-five 6 mm-thick subsamples were analyzed using alternating field and thermal demagnetization protocols, providing well-defined, primary magnetic directions. An age model of the stalagmite was obtained by fitting its paleomagnetic record with the reference paleosecular variation curves obtained by previous paleo-reconstruction models, applying statistical bootstrapping analysis to define their best fit. The resulting age models fit closely with the radioisotopic age model but provide a significantly higher time resolution. We reach the same conclusion when applying this approach to another stalagmite from the Algarve region of Portugal. Our approach thus appears a promising alternative to date young speleothems with high detrital contents.
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spelling pubmed-96059622022-10-28 Paleomagnetic techniques can date speleothems with high concentrations of detrital material Sánchez-Moreno, Elisa M. Font, Eric Pavón-Carrasco, F. Javier Dimuccio, Luca A. Hillaire-Marcel, Claude Ghaleb, Bassam Cunha, Lúcio Sci Rep Article The U-series dating of young and ‘dirty’ speleothems is challenging due to difficulties in assessing the isotopic composition of detrital contaminants and the low-abundance of (230)Th generated in situ. Here we propose a new dating approach based on the comparison of a speleothem’s paleomagnetic directions to reference curves from global paleomagnetic reconstructions. This approach is demonstrated on a stalagmite collected from the Soprador do Carvalho cave in the Central Region of Portugal. A radioisotopic age model, built using four U-series ages and three (14)C, suggests relatively steady carbonate precipitation from ~ 5760 BCE until ~ 1920 CE. Forty-five 6 mm-thick subsamples were analyzed using alternating field and thermal demagnetization protocols, providing well-defined, primary magnetic directions. An age model of the stalagmite was obtained by fitting its paleomagnetic record with the reference paleosecular variation curves obtained by previous paleo-reconstruction models, applying statistical bootstrapping analysis to define their best fit. The resulting age models fit closely with the radioisotopic age model but provide a significantly higher time resolution. We reach the same conclusion when applying this approach to another stalagmite from the Algarve region of Portugal. Our approach thus appears a promising alternative to date young speleothems with high detrital contents. Nature Publishing Group UK 2022-10-26 /pmc/articles/PMC9605962/ /pubmed/36289261 http://dx.doi.org/10.1038/s41598-022-21761-9 Text en © The Author(s) 2022 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Sánchez-Moreno, Elisa M.
Font, Eric
Pavón-Carrasco, F. Javier
Dimuccio, Luca A.
Hillaire-Marcel, Claude
Ghaleb, Bassam
Cunha, Lúcio
Paleomagnetic techniques can date speleothems with high concentrations of detrital material
title Paleomagnetic techniques can date speleothems with high concentrations of detrital material
title_full Paleomagnetic techniques can date speleothems with high concentrations of detrital material
title_fullStr Paleomagnetic techniques can date speleothems with high concentrations of detrital material
title_full_unstemmed Paleomagnetic techniques can date speleothems with high concentrations of detrital material
title_short Paleomagnetic techniques can date speleothems with high concentrations of detrital material
title_sort paleomagnetic techniques can date speleothems with high concentrations of detrital material
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9605962/
https://www.ncbi.nlm.nih.gov/pubmed/36289261
http://dx.doi.org/10.1038/s41598-022-21761-9
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