Assessing the biomineralization processes in the shell layers of modern brachiopods from oxygen isotopic composition and elemental ratios: Implications for their use as paleoenvironmental proxies.
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| Title: | Assessing the biomineralization processes in the shell layers of modern brachiopods from oxygen isotopic composition and elemental ratios: Implications for their use as paleoenvironmental proxies. |
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| Authors: | Rollion-Bard, Claire1 (AUTHOR) rollion@ipgp.fr, Milner Garcia, Sara1 (AUTHOR), Burckel, Pierre1 (AUTHOR), Angiolini, Lucia2 (AUTHOR), Jurikova, Hana1,3 (AUTHOR), Tomašových, Adam4 (AUTHOR), Henkel, Daniela3 (AUTHOR) |
| Source: | Chemical Geology. Oct2019, Vol. 524, p49-66. 18p. |
| Subjects: | Alkaline earth metals, Biomineralization, Brachiopoda, Trace elements, Oxygen, Proxy |
| Abstract: | Fossil brachiopod shells are often used as valuable archives to reconstruct paleoenvironmental conditions in deep time. However, biomineralization processes can impact their fidelity as geochemical proxies. Brachiopod shells comprise an outer primary layer, a secondary fibrous layer and sometimes, a tertiary columnar layer. Therefore, it is essential to assess the potential effects of the biomineralization processes in each of the different shell microstructures of modern brachiopods. This study analyses the oxygen isotopic composition together with Li/Ca, Na/Ca Mg/Ca and Sr/Ca data at high spatial (20-50 μm) resolution in seven modern brachiopod species, focusing on differences between the primary, secondary and tertiary layers. In all studied species, δ18O values of the outer primary layer are consistently out of equilibrium with seawater. Also, this shell layer is enriched in Li, Na, Mg and Sr. Contrary to the primary layer, the innermost secondary layer is near or at oxygen isotopic and elemental equilibrium with ambient seawater. The columnar tertiary shell layer, if present, has the least variable and the heaviest oxygen isotopic composition, within the range of equilibrium values with seawater. This tertiary layer, however, is depleted in minor and trace elements relative to the other shell layers. Thus, the tertiary layer is more suitable for oxygen isotopic studies, whereas the innermost secondary layer of the most mature parts of the shell is the best target in two-layered shells. While we do not observe any clear interspecific relationships between Mg/Ca and Sr/Ca ratios, on one hand, and environmental parameters such as temperature, salinity and pH, on the other hand, there is a positive interspecific relationship between Na/Ca and salinity and a negative interspecific relationship between Li/Ca and temperature, suggesting their potential use as proxies of physicochemical parameters of seawater. [ABSTRACT FROM AUTHOR] |
| Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 140978600 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Assessing the biomineralization processes in the shell layers of modern brachiopods from oxygen isotopic composition and elemental ratios: Implications for their use as paleoenvironmental proxies. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rollion-Bard%2C+Claire%22">Rollion-Bard, Claire</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rollion@ipgp.fr</i><br /><searchLink fieldCode="AR" term="%22Milner+Garcia%2C+Sara%22">Milner Garcia, Sara</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burckel%2C+Pierre%22">Burckel, Pierre</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Angiolini%2C+Lucia%22">Angiolini, Lucia</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jurikova%2C+Hana%22">Jurikova, Hana</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tomašových%2C+Adam%22">Tomašových, Adam</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Henkel%2C+Daniela%22">Henkel, Daniela</searchLink><relatesTo>3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Chemical+Geology%22">Chemical Geology</searchLink>. Oct2019, Vol. 524, p49-66. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Alkaline+earth+metals%22">Alkaline earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22Biomineralization%22">Biomineralization</searchLink><br /><searchLink fieldCode="DE" term="%22Brachiopoda%22">Brachiopoda</searchLink><br /><searchLink fieldCode="DE" term="%22Trace+elements%22">Trace elements</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen%22">Oxygen</searchLink><br /><searchLink fieldCode="DE" term="%22Proxy%22">Proxy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Fossil brachiopod shells are often used as valuable archives to reconstruct paleoenvironmental conditions in deep time. However, biomineralization processes can impact their fidelity as geochemical proxies. Brachiopod shells comprise an outer primary layer, a secondary fibrous layer and sometimes, a tertiary columnar layer. Therefore, it is essential to assess the potential effects of the biomineralization processes in each of the different shell microstructures of modern brachiopods. This study analyses the oxygen isotopic composition together with Li/Ca, Na/Ca Mg/Ca and Sr/Ca data at high spatial (20-50 μm) resolution in seven modern brachiopod species, focusing on differences between the primary, secondary and tertiary layers. In all studied species, δ18O values of the outer primary layer are consistently out of equilibrium with seawater. Also, this shell layer is enriched in Li, Na, Mg and Sr. Contrary to the primary layer, the innermost secondary layer is near or at oxygen isotopic and elemental equilibrium with ambient seawater. The columnar tertiary shell layer, if present, has the least variable and the heaviest oxygen isotopic composition, within the range of equilibrium values with seawater. This tertiary layer, however, is depleted in minor and trace elements relative to the other shell layers. Thus, the tertiary layer is more suitable for oxygen isotopic studies, whereas the innermost secondary layer of the most mature parts of the shell is the best target in two-layered shells. While we do not observe any clear interspecific relationships between Mg/Ca and Sr/Ca ratios, on one hand, and environmental parameters such as temperature, salinity and pH, on the other hand, there is a positive interspecific relationship between Na/Ca and salinity and a negative interspecific relationship between Li/Ca and temperature, suggesting their potential use as proxies of physicochemical parameters of seawater. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.chemgeo.2019.05.031 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 49 Subjects: – SubjectFull: Alkaline earth metals Type: general – SubjectFull: Biomineralization Type: general – SubjectFull: Brachiopoda Type: general – SubjectFull: Trace elements Type: general – SubjectFull: Oxygen Type: general – SubjectFull: Proxy Type: general Titles: – TitleFull: Assessing the biomineralization processes in the shell layers of modern brachiopods from oxygen isotopic composition and elemental ratios: Implications for their use as paleoenvironmental proxies. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rollion-Bard, Claire – PersonEntity: Name: NameFull: Milner Garcia, Sara – PersonEntity: Name: NameFull: Burckel, Pierre – PersonEntity: Name: NameFull: Angiolini, Lucia – PersonEntity: Name: NameFull: Jurikova, Hana – PersonEntity: Name: NameFull: Tomašových, Adam – PersonEntity: Name: NameFull: Henkel, Daniela IsPartOfRelationships: – BibEntity: Dates: – D: 05 M: 10 Text: Oct2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 00092541 Numbering: – Type: volume Value: 524 Titles: – TitleFull: Chemical Geology Type: main |
| ResultId | 1 |
