Ideas and perspectives: Mineralizing fluid control on foreign elements in biogenic CaCO3: insights from otoliths.
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| Title: | Ideas and perspectives: Mineralizing fluid control on foreign elements in biogenic CaCO |
|---|---|
| Authors: | Kekelou, Athina1 (AUTHOR) athina.kekelou@uab.cat, Langer, Gerald1,2 (AUTHOR) gerald.langer@awi.de, Ziveri, Patrizia1,3,4 (AUTHOR) |
| Source: | Biogeosciences. 2026, Vol. 23 Issue 8, p2831-2845. 15p. |
| Subject Terms: | *Otoliths, *Trace elements, *Biomineralization, *Calcium carbonate, *Calcification, *Analytical geochemistry |
| Abstract: | The foreign element composition of calcium carbonate (CaCO3) biominerals from marine calcifying organisms leaving a sedimentary record has been used for decades to reconstruct various biogeochemical parameters. Advancing geochemical proxies and understanding their underlying mechanisms is essential for climate reconstructions, environmental research, and investigations of biomineralization processes. Despite considerable success of proxy applications, limited mechanistic understanding still restricts their full potential. The problem is often summarized by the term "vital effect", i.e. foreign element partitioning due to biological activity. The element partitioning from the calcifying fluid into the biomineral, however, is usually described in terms of inorganic precipitation of a mineral from an aqueous solution of inorganic ions. Although this assumption is central to many partitioning models it has not been tested because the calcifying fluid of classic proxy archives such as foraminifera, molluscs, and coccolithophores has not been successfully sampled for element analysis. The calcifying fluid of fish otolith formation (endolymph), by contrast, was sampled and chemically analysed accompanied by corresponding otolith data. However, previous datasets have not been compared to inorganic partitioning coefficients to test this assumption. In this study, we address this gap using published data from four fish species and six elements. Our results indicate that the final stage of otolith foreign element incorporation is influenced by organic matter in the endolymph fluid and therefore cannot be considered purely inorganic. Our conclusion questions a central assumption of many foreign element partitioning models. This does not imply that existing models are questionable, but that they share a common oversimplification. By removing this oversimplification all kinds of different models can be improved. Our study contributes broadly to the understanding of biogenic CaCO3 geochemistry, and it is relevant to the majority of existing models. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 193632338 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Ideas and perspectives: Mineralizing fluid control on foreign elements in biogenic CaCO<subscript>3</subscript>: insights from otoliths. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kekelou%2C+Athina%22">Kekelou, Athina</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> athina.kekelou@uab.cat</i><br /><searchLink fieldCode="AR" term="%22Langer%2C+Gerald%22">Langer, Gerald</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> gerald.langer@awi.de</i><br /><searchLink fieldCode="AR" term="%22Ziveri%2C+Patrizia%22">Ziveri, Patrizia</searchLink><relatesTo>1,3,4</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Biogeosciences%22">Biogeosciences</searchLink>. 2026, Vol. 23 Issue 8, p2831-2845. 15p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Otoliths%22">Otoliths</searchLink><br />*<searchLink fieldCode="DE" term="%22Trace+elements%22">Trace elements</searchLink><br />*<searchLink fieldCode="DE" term="%22Biomineralization%22">Biomineralization</searchLink><br />*<searchLink fieldCode="DE" term="%22Calcium+carbonate%22">Calcium carbonate</searchLink><br />*<searchLink fieldCode="DE" term="%22Calcification%22">Calcification</searchLink><br />*<searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The foreign element composition of calcium carbonate (CaCO3) biominerals from marine calcifying organisms leaving a sedimentary record has been used for decades to reconstruct various biogeochemical parameters. Advancing geochemical proxies and understanding their underlying mechanisms is essential for climate reconstructions, environmental research, and investigations of biomineralization processes. Despite considerable success of proxy applications, limited mechanistic understanding still restricts their full potential. The problem is often summarized by the term "vital effect", i.e. foreign element partitioning due to biological activity. The element partitioning from the calcifying fluid into the biomineral, however, is usually described in terms of inorganic precipitation of a mineral from an aqueous solution of inorganic ions. Although this assumption is central to many partitioning models it has not been tested because the calcifying fluid of classic proxy archives such as foraminifera, molluscs, and coccolithophores has not been successfully sampled for element analysis. The calcifying fluid of fish otolith formation (endolymph), by contrast, was sampled and chemically analysed accompanied by corresponding otolith data. However, previous datasets have not been compared to inorganic partitioning coefficients to test this assumption. In this study, we address this gap using published data from four fish species and six elements. Our results indicate that the final stage of otolith foreign element incorporation is influenced by organic matter in the endolymph fluid and therefore cannot be considered purely inorganic. Our conclusion questions a central assumption of many foreign element partitioning models. This does not imply that existing models are questionable, but that they share a common oversimplification. By removing this oversimplification all kinds of different models can be improved. Our study contributes broadly to the understanding of biogenic CaCO3 geochemistry, and it is relevant to the majority of existing models. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=193632338 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.5194/bg-23-2831-2026 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 2831 Subjects: – SubjectFull: Otoliths Type: general – SubjectFull: Trace elements Type: general – SubjectFull: Biomineralization Type: general – SubjectFull: Calcium carbonate Type: general – SubjectFull: Calcification Type: general – SubjectFull: Analytical geochemistry Type: general Titles: – TitleFull: Ideas and perspectives: Mineralizing fluid control on foreign elements in biogenic CaCO3: insights from otoliths. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kekelou, Athina – PersonEntity: Name: NameFull: Langer, Gerald – PersonEntity: Name: NameFull: Ziveri, Patrizia IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 04 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 17264170 Numbering: – Type: volume Value: 23 – Type: issue Value: 8 Titles: – TitleFull: Biogeosciences Type: main |
| ResultId | 1 |
