Sökning: onr:"swepub:oai:DiVA.org:su-180196" >
Ikaite nucleation a...
Ikaite nucleation at 35°C challenges the use of glendonite as a paleotemperature indicator
-
- Tollefsen, Elin (författare)
- Stockholms universitet,Institutionen för geologiska vetenskaper
-
Balic-Zunic, Tonci (författare)
-
- Mörth, Carl-Magnus (författare)
- Stockholms universitet,Institutionen för geologiska vetenskaper
-
visa fler...
-
Bruchert, Volker (författare)
-
Lee, Cheng Choo (författare)
-
- Skelton, Alasdair (författare)
- Stockholms universitet,Institutionen för geologiska vetenskaper
-
visa färre...
-
(creator_code:org_t)
- 2020-05-18
- 2020
- Engelska.
-
Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 10
- Relaterad länk:
-
https://doi.org/10.1...
-
visa fler...
-
https://www.nature.c...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Geology
- geologi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas