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Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator
Glendonites have been found worldwide in marine sediments from the Neoproterozoic Era to the Quaternary Period. The precursor of glendonite, ikaite (CaCO(3) · 6H(2)O), is metastable and has only been observed in nature at temperatures <7 °C. Therefore, glendonites in the sedimentary record are co...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7235076/ https://www.ncbi.nlm.nih.gov/pubmed/32424173 http://dx.doi.org/10.1038/s41598-020-64751-5 |
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author | Tollefsen, Elin Balic-Zunic, Tonci Mörth, Carl-Magnus Brüchert, Volker Lee, Cheng Choo Skelton, Alasdair |
author_facet | Tollefsen, Elin Balic-Zunic, Tonci Mörth, Carl-Magnus Brüchert, Volker Lee, Cheng Choo Skelton, Alasdair |
author_sort | Tollefsen, Elin |
collection | PubMed |
description | Glendonites have been found worldwide in marine sediments from the Neoproterozoic Era to the Quaternary Period. The precursor of glendonite, ikaite (CaCO(3) · 6H(2)O), is metastable and has only been observed in nature at temperatures <7 °C. Therefore, glendonites in the sedimentary record are commonly used as paleotemperature indicators. However, several laboratory experiments have shown that the mineral can nucleate at temperatures>7 °C. Here we investigate the nucleation range for ikaite as a function of temperature and pH. We found that ikaite precipitated at temperatures of at least 35 °C at pH 9.3 −10.3 from a mixture of natural seawater and sodium carbonate rich solution. At pH 9.3, we observed pseudomorphic replacement of ikaite by porous calcite during the duration of the experiment (c. 5 hours). These results imply that ikaite can form at relatively high temperatures but will then be rapidly replaced by a calcite pseudomorph. This finding challenges the use of glendonites as paleotemperature indicators. |
format | Online Article Text |
id | pubmed-7235076 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-72350762020-05-26 Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator Tollefsen, Elin Balic-Zunic, Tonci Mörth, Carl-Magnus Brüchert, Volker Lee, Cheng Choo Skelton, Alasdair Sci Rep Article Glendonites have been found worldwide in marine sediments from the Neoproterozoic Era to the Quaternary Period. The precursor of glendonite, ikaite (CaCO(3) · 6H(2)O), is metastable and has only been observed in nature at temperatures <7 °C. Therefore, glendonites in the sedimentary record are commonly used as paleotemperature indicators. However, several laboratory experiments have shown that the mineral can nucleate at temperatures>7 °C. Here we investigate the nucleation range for ikaite as a function of temperature and pH. We found that ikaite precipitated at temperatures of at least 35 °C at pH 9.3 −10.3 from a mixture of natural seawater and sodium carbonate rich solution. At pH 9.3, we observed pseudomorphic replacement of ikaite by porous calcite during the duration of the experiment (c. 5 hours). These results imply that ikaite can form at relatively high temperatures but will then be rapidly replaced by a calcite pseudomorph. This finding challenges the use of glendonites as paleotemperature indicators. Nature Publishing Group UK 2020-05-18 /pmc/articles/PMC7235076/ /pubmed/32424173 http://dx.doi.org/10.1038/s41598-020-64751-5 Text en © The Author(s) 2020 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 Tollefsen, Elin Balic-Zunic, Tonci Mörth, Carl-Magnus Brüchert, Volker Lee, Cheng Choo Skelton, Alasdair Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator |
title | Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator |
title_full | Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator |
title_fullStr | Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator |
title_full_unstemmed | Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator |
title_short | Ikaite nucleation at 35 °C challenges the use of glendonite as a paleotemperature indicator |
title_sort | ikaite nucleation at 35 °c challenges the use of glendonite as a paleotemperature indicator |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7235076/ https://www.ncbi.nlm.nih.gov/pubmed/32424173 http://dx.doi.org/10.1038/s41598-020-64751-5 |
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