Lithium elemental and isotope systematics of modern and cultured brachiopods: Implications for seawater evolution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000207" target="_blank" >RIV/00025798:_____/21:00000207 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60460709:41330/21:89926

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S000925412100509X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S000925412100509X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.chemgeo.2021.120566" target="_blank" >10.1016/j.chemgeo.2021.120566</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lithium elemental and isotope systematics of modern and cultured brachiopods: Implications for seawater evolution

Popis výsledku v původním jazyce

Lithium has proven a powerful tracer of weathering processes and chemical evolution of seawater. 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–pCO2, temperature, Mg/Ca ratio). The recent brachiopod specimens collected across different temperate and polar environments showed broadly consistent delta7Li values ranging from 25.2 to 28.1per mille (with mean delta7Li of 26.9 ± 1.5per mille), 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 delta7Licalcite–seawater values (per mil difference in 7Li/6Li between brachiopod calcite shell and seawater) from -2.9per mille to -5.8per mille (with mean delta7Licalcite–seawater value of -3.6per mille), which is larger than the delta7Licalcite–seawater values calculated based on data from planktonic foraminifera (~0per mille to ~-4per mille). This range of values is further supported by results from brachiopods cultured experimentally. Under controlled culturing conditions simulating the natural marine environment, the delta7Licalcite–seawater for Magellania venosa was -2.5per mille 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 CaCl2 as well as elevated pCO2, and hence low-pH conditions, resulted in an increased delta7Licalcite-seawater up to -4.6per mille. Collectively, our results indicate that brachiopods represent valuable archives and provide an envelope for robust Li-based reconstruction of seawater evolution over the Phanerozoic.

Název v anglickém jazyce

Lithium elemental and isotope systematics of modern and cultured brachiopods: Implications for seawater evolution

Popis výsledku anglicky

Lithium has proven a powerful tracer of weathering processes and chemical evolution of seawater. 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–pCO2, temperature, Mg/Ca ratio). The recent brachiopod specimens collected across different temperate and polar environments showed broadly consistent delta7Li values ranging from 25.2 to 28.1per mille (with mean delta7Li of 26.9 ± 1.5per mille), 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 delta7Licalcite–seawater values (per mil difference in 7Li/6Li between brachiopod calcite shell and seawater) from -2.9per mille to -5.8per mille (with mean delta7Licalcite–seawater value of -3.6per mille), which is larger than the delta7Licalcite–seawater values calculated based on data from planktonic foraminifera (~0per mille to ~-4per mille). This range of values is further supported by results from brachiopods cultured experimentally. Under controlled culturing conditions simulating the natural marine environment, the delta7Licalcite–seawater for Magellania venosa was -2.5per mille 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 CaCl2 as well as elevated pCO2, and hence low-pH conditions, resulted in an increased delta7Licalcite-seawater up to -4.6per mille. Collectively, our results indicate that brachiopods represent valuable archives and provide an envelope for robust Li-based reconstruction of seawater evolution over the Phanerozoic.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

R - Projekt Ramcoveho programu EK

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemical Geology

ISSN

0009-2541

e-ISSN

—

Svazek periodika

586

Číslo periodika v rámci svazku

December : 120566

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

nestránkováno

Kód UT WoS článku

000720228300004

EID výsledku v databázi Scopus

2-s2.0-85118890945