Cargando…
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...
Autores principales: | , , , , , , |
---|---|
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 |
_version_ | 1784818192379543552 |
---|---|
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. |
format | Online Article Text |
id | pubmed-9605962 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT sanchezmorenoelisam paleomagnetictechniquescandatespeleothemswithhighconcentrationsofdetritalmaterial AT fonteric paleomagnetictechniquescandatespeleothemswithhighconcentrationsofdetritalmaterial AT pavoncarrascofjavier paleomagnetictechniquescandatespeleothemswithhighconcentrationsofdetritalmaterial AT dimucciolucaa paleomagnetictechniquescandatespeleothemswithhighconcentrationsofdetritalmaterial AT hillairemarcelclaude paleomagnetictechniquescandatespeleothemswithhighconcentrationsofdetritalmaterial AT ghalebbassam paleomagnetictechniquescandatespeleothemswithhighconcentrationsofdetritalmaterial AT cunhalucio paleomagnetictechniquescandatespeleothemswithhighconcentrationsofdetritalmaterial |