Charrieau, Laurie;
Rollion-Bard, Claire;
Terbrueggen, Anja;
Wilson, David;
Pogge von Strandmann, Philip;
Misra, Sambuddha;
Bijma, Jelle;
(2023)
Controls on Lithium Incorporation and Isotopic Fractionation in Large Benthic Foraminifera.
Minerals
, 13
(1)
, Article 127. 10.3390/min13010127.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Controls on Lithium Incorporation and Isotopic Fractionation in Large Benthic Foraminifera |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3390/min13010127 |
| Publisher version: | https://doi.org/10.3390/min13010127 |
| Language: | English |
| Additional information: | © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | δ7Li; Li/Ca; lithium; large benthic foraminifera; culture experiments; pH; DIC; geochemical proxies |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10163500 |
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