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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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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. / Rollion-Bard, Claire; Milner Garcia, Sara; Burckel, Pierre; Angiolini, Lucia; Jurikova, Hana; Tomašových, Adam; Henkel, Daniela.

In: Chemical Geology, Vol. 524, 05.10.2019, p. 49-66.

Research output: Contribution to journalArticlepeer-review

Harvard

Rollion-Bard, C, Milner Garcia, S, Burckel, P, Angiolini, L, Jurikova, H, Tomašových, A & Henkel, D 2019, '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', Chemical Geology, vol. 524, pp. 49-66. https://doi.org/10.1016/j.chemgeo.2019.05.031

APA

Rollion-Bard, C., Milner Garcia, S., Burckel, P., Angiolini, L., Jurikova, H., Tomašových, A., & Henkel, D. (2019). 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. Chemical Geology, 524, 49-66. https://doi.org/10.1016/j.chemgeo.2019.05.031

Vancouver

Rollion-Bard C, Milner Garcia S, Burckel P, Angiolini L, Jurikova H, Tomašových A et al. 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. Chemical Geology. 2019 Oct 5;524:49-66. https://doi.org/10.1016/j.chemgeo.2019.05.031

Author

Rollion-Bard, Claire ; Milner Garcia, Sara ; Burckel, Pierre ; Angiolini, Lucia ; Jurikova, Hana ; Tomašových, Adam ; Henkel, Daniela. / 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. In: Chemical Geology. 2019 ; Vol. 524. pp. 49-66.

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@article{21214abcb4c14268ac4bbbe69ebf2b92,
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",
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.",
keywords = "Brachiopod, Element-to-calcium ratios, Oxygen isotopes, Proxy, Shell microstructure, Vital effects",
author = "Claire Rollion-Bard and {Milner Garcia}, Sara and Pierre Burckel and Lucia Angiolini and Hana Jurikova and Adam Toma{\v s}ov{\'y}ch and Daniela Henkel",
note = "This project was funded by the European Union's Horizon 2020 research and innovation program under the Marie Sk{\l}odowska-Curie grant agreement nN°. 643084 (BASE-LiNE Earth). Parts of this work were supported by IPGP multidisciplinary program PARI, and by Region {\^i}le-de-France SESAME Grant N°. 12015908. ",
year = "2019",
month = oct,
day = "5",
doi = "10.1016/j.chemgeo.2019.05.031",
language = "English",
volume = "524",
pages = "49--66",
journal = "Chemical Geology",
issn = "0009-2541",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Assessing the biomineralization processes in the shell layers of modern brachiopods from oxygen isotopic composition and elemental ratios

T2 - implications for their use as paleoenvironmental proxies

AU - Rollion-Bard, Claire

AU - Milner Garcia, Sara

AU - Burckel, Pierre

AU - Angiolini, Lucia

AU - Jurikova, Hana

AU - Tomašových, Adam

AU - Henkel, Daniela

N1 - This project was funded by the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement nN°. 643084 (BASE-LiNE Earth). Parts of this work were supported by IPGP multidisciplinary program PARI, and by Region île-de-France SESAME Grant N°. 12015908.

PY - 2019/10/5

Y1 - 2019/10/5

N2 - 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.

AB - 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.

KW - Brachiopod

KW - Element-to-calcium ratios

KW - Oxygen isotopes

KW - Proxy

KW - Shell microstructure

KW - Vital effects

U2 - 10.1016/j.chemgeo.2019.05.031

DO - 10.1016/j.chemgeo.2019.05.031

M3 - Article

AN - SCOPUS:85067687241

VL - 524

SP - 49

EP - 66

JO - Chemical Geology

JF - Chemical Geology

SN - 0009-2541

ER -

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