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Ikaite nucleation a...
Ikaite nucleation at 35°C challenges the use of glendonite as a paleotemperature indicator
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- Tollefsen, Elin (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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Balic-Zunic, Tonci (author)
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- Mörth, Carl-Magnus (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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Bruchert, Volker (author)
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Lee, Cheng Choo (author)
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- Skelton, Alasdair (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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(creator_code:org_t)
- 2020-05-18
- 2020
- English.
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 10
- Related links:
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https://doi.org/10.1...
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https://www.nature.c...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Glendonites have been found worldwide in marine sediments from the Neoproterozoic Era to the Quaternary Period. The precursor of glendonite, ikaite (CaCO3 · 6H2O), 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Geology
- geologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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