Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution
Lithium has proven a powerful tracer of weathering processes and chemical seawater evolution. Skeletal components of marine calcifying organisms, and in particular brachiopods, present promising archives of Li signatures. However, Li incorporation mechanisms and potential influence from biological p...
Published in: | Chemical Geology |
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2021
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/lithium-elemental-and-isotope-systematics-of-modern-and-cultured-brachiopods(915162f2-fd8b-4466-8374-c7e14cfb286d).html https://doi.org/10.1016/j.chemgeo.2021.120566 https://research-repository.st-andrews.ac.uk/bitstream/10023/24370/1/Gaspers_2021_Chemical_Geology_Lithium_elemental_isotope_systematics_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/915162f2-fd8b-4466-8374-c7e14cfb286d 2024-06-23T07:56:18+00:00 Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution Gaspers, Natalie Magna, Tomáš Jurikova, Hana Henkel, Daniela Eisenhauer, Anton Azmy, Karem Tomašovych, Adam 2021-12-30 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/lithium-elemental-and-isotope-systematics-of-modern-and-cultured-brachiopods(915162f2-fd8b-4466-8374-c7e14cfb286d).html https://doi.org/10.1016/j.chemgeo.2021.120566 https://research-repository.st-andrews.ac.uk/bitstream/10023/24370/1/Gaspers_2021_Chemical_Geology_Lithium_elemental_isotope_systematics_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/lithium-elemental-and-isotope-systematics-of-modern-and-cultured-brachiopods(915162f2-fd8b-4466-8374-c7e14cfb286d).html info:eu-repo/semantics/openAccess Gaspers , N , Magna , T , Jurikova , H , Henkel , D , Eisenhauer , A , Azmy , K & Tomašovych , A 2021 , ' Lithium elemental and isotope systematics of modern and cultured brachiopods : implications for seawater evolution ' , Chemical Geology , vol. 586 , 120566 . https://doi.org/10.1016/j.chemgeo.2021.120566 Lithium isotopes Brachiopod calcite Controlled culturing experiements Seawater history Paleo-proxy article 2021 ftunstandrewcris https://doi.org/10.1016/j.chemgeo.2021.120566 2024-06-13T01:18:33Z Lithium has proven a powerful tracer of weathering processes and chemical seawater evolution. Skeletal components of marine calcifying organisms, and in particular brachiopods, present promising archives of Li signatures. However, Li incorporation mechanisms and potential influence from biological processes or environmental conditions require a careful assessment. In order to constrain Li systematics in brachiopod shells, we present Li concentrations and isotope compositions for 11 calcitic brachiopod species collected from six different geographic regions, paralleled with data from culturing experiments where brachiopods were grown under varying environmental conditions and seawater chemistry (pH–pCO 2 , temperature, Mg/Ca ratio). The recent brachiopod specimens collected across different temperate and polar environments showed broadly consistent δ 7 Li values ranging from 25.2 to 28.1‰ (with mean δ 7 Li of 26.9 ± 1.5‰), irrespective of taxonomic rank, indicating that incorporation of Li isotopes into brachiopod shells is not strongly affected by vital effects related to differences among species. This results in Δ 7 Li calcite–seawater values (per mil difference in 7 Li/ 6 Li between brachiopod calcite shell and seawater) from −2.9‰ to −5.8‰ (with mean Δ 7 Li calcite–seawater value of −3.6‰), which is larger than the Δ 7 Li calcite–seawater values calculated based on data from planktonic foraminifera (~0‰ to ~−4‰). This range of values is further supported by results from brachiopods cultured experimentally. Under controlled culturing conditions simulating the natural marine environment, the Δ 7 Li calcite–seawater for Magellania venosa was −2.5‰ and not affected by an increase in temperature from 10 to 16 °C. In contrast, a decrease in Mg/Ca (or Li/Ca) ratio of seawater by addition of CaCl 2 as well as elevated pCO 2 , and hence low-pH conditions, resulted in an increased Δ 7 Li calcite-seawater up to −4.6‰. Collectively, our results indicate that brachiopods represent valuable archives and provide an ... Article in Journal/Newspaper Planktonic foraminifera University of St Andrews: Research Portal Chemical Geology 586 120566 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Lithium isotopes Brachiopod calcite Controlled culturing experiements Seawater history Paleo-proxy |
spellingShingle |
Lithium isotopes Brachiopod calcite Controlled culturing experiements Seawater history Paleo-proxy Gaspers, Natalie Magna, Tomáš Jurikova, Hana Henkel, Daniela Eisenhauer, Anton Azmy, Karem Tomašovych, Adam Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution |
topic_facet |
Lithium isotopes Brachiopod calcite Controlled culturing experiements Seawater history Paleo-proxy |
description |
Lithium has proven a powerful tracer of weathering processes and chemical seawater evolution. Skeletal components of marine calcifying organisms, and in particular brachiopods, present promising archives of Li signatures. However, Li incorporation mechanisms and potential influence from biological processes or environmental conditions require a careful assessment. In order to constrain Li systematics in brachiopod shells, we present Li concentrations and isotope compositions for 11 calcitic brachiopod species collected from six different geographic regions, paralleled with data from culturing experiments where brachiopods were grown under varying environmental conditions and seawater chemistry (pH–pCO 2 , temperature, Mg/Ca ratio). The recent brachiopod specimens collected across different temperate and polar environments showed broadly consistent δ 7 Li values ranging from 25.2 to 28.1‰ (with mean δ 7 Li of 26.9 ± 1.5‰), irrespective of taxonomic rank, indicating that incorporation of Li isotopes into brachiopod shells is not strongly affected by vital effects related to differences among species. This results in Δ 7 Li calcite–seawater values (per mil difference in 7 Li/ 6 Li between brachiopod calcite shell and seawater) from −2.9‰ to −5.8‰ (with mean Δ 7 Li calcite–seawater value of −3.6‰), which is larger than the Δ 7 Li calcite–seawater values calculated based on data from planktonic foraminifera (~0‰ to ~−4‰). This range of values is further supported by results from brachiopods cultured experimentally. Under controlled culturing conditions simulating the natural marine environment, the Δ 7 Li calcite–seawater for Magellania venosa was −2.5‰ and not affected by an increase in temperature from 10 to 16 °C. In contrast, a decrease in Mg/Ca (or Li/Ca) ratio of seawater by addition of CaCl 2 as well as elevated pCO 2 , and hence low-pH conditions, resulted in an increased Δ 7 Li calcite-seawater up to −4.6‰. Collectively, our results indicate that brachiopods represent valuable archives and provide an ... |
format |
Article in Journal/Newspaper |
author |
Gaspers, Natalie Magna, Tomáš Jurikova, Hana Henkel, Daniela Eisenhauer, Anton Azmy, Karem Tomašovych, Adam |
author_facet |
Gaspers, Natalie Magna, Tomáš Jurikova, Hana Henkel, Daniela Eisenhauer, Anton Azmy, Karem Tomašovych, Adam |
author_sort |
Gaspers, Natalie |
title |
Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution |
title_short |
Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution |
title_full |
Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution |
title_fullStr |
Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution |
title_full_unstemmed |
Lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution |
title_sort |
lithium elemental and isotope systematics of modern and cultured brachiopods:implications for seawater evolution |
publishDate |
2021 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/lithium-elemental-and-isotope-systematics-of-modern-and-cultured-brachiopods(915162f2-fd8b-4466-8374-c7e14cfb286d).html https://doi.org/10.1016/j.chemgeo.2021.120566 https://research-repository.st-andrews.ac.uk/bitstream/10023/24370/1/Gaspers_2021_Chemical_Geology_Lithium_elemental_isotope_systematics_CC.pdf |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Gaspers , N , Magna , T , Jurikova , H , Henkel , D , Eisenhauer , A , Azmy , K & Tomašovych , A 2021 , ' Lithium elemental and isotope systematics of modern and cultured brachiopods : implications for seawater evolution ' , Chemical Geology , vol. 586 , 120566 . https://doi.org/10.1016/j.chemgeo.2021.120566 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/lithium-elemental-and-isotope-systematics-of-modern-and-cultured-brachiopods(915162f2-fd8b-4466-8374-c7e14cfb286d).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.chemgeo.2021.120566 |
container_title |
Chemical Geology |
container_volume |
586 |
container_start_page |
120566 |
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