Controls on Lithium Incorporation and Isotopic Fractionation in Large Benthic Foraminifera

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Abstract
<jats:p>The lithium (Li) isotopic composition of carbonates is considered to be a reliable archive of past seawater Li isotopic compositions, which are useful as a tracer of silicate weathering. However, δ7Li values have been shown to be dependent on either pH or DIC in two studies using similar species of large, benthic foraminifera from the genus Amphistegina. To resolve this issue, we conducted culture experiments on Amphistegina lessonii in decoupled pH–DIC conditions, under two different light treatments, and with normal or Li-enriched seawater. The δ7Li values and Li/Ca ratios in the foraminifera tests were analysed by ion microprobe and LA-ICP-MS, respectively. No links between either the pH or DIC and δ7Li or Li/Ca values were observed for any of the treatments, and growth rates also did not seem to influence the Li incorporation or isotopic fractionation, contrary to observations from inorganic carbonate-precipitation experiments. Overall, these findings appear to support the use of Li isotopes in large benthic foraminifera to reconstruct past seawater chemistry and to infer changes in chemical weathering during carbon-cycle perturbations.</jats:p>
Autoren
  • Laurie M Charrieau
  • Claire Rollion-Bard
  • Anja Terbrueggen
  • David J Wilson
  • Philip AE Pogge von Strandmann
  • Sambuddha Misra
  • Jelle Bijma
DOI
10.3390/min13010127
eISSN
2075-163X
Ausgabe der Veröffentlichung
1
Zeitschrift
Minerals
Sprache
en
Online publication date
2023
Paginierung
127 - 127
Status
Published online
Herausgeber
MDPI AG
Herausgeber URL
http://dx.doi.org/10.3390/min13010127
Datum der Datenerfassung
2023
Titel
Controls on Lithium Incorporation and Isotopic Fractionation in Large Benthic Foraminifera
Ausgabe der Zeitschrift
13

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