Li partitioning in the benthic foraminifera Amphistegina lessonii

Gerald Langer, Aleksey Sadekov, Silke Thoms, Antje Mewes, Gernot Nehrke, Mervyn Greaves, Sambuddha Misra, Jelle Bijma, Henry Elderfield

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Abstract

The shallow water benthic foraminifer Amphistegina lessonii was grown in seawater of variable Li and Ca concentration and shell Li/Ca was determined by means of LA-ICPMS. Shell Li/Ca is positively correlated to seawater Li/Ca only when the Li concentration of seawater is changed. If the seawater Ca concentration is changed, shell Li/Ca remains constant. This indicates that Li does not compete with Ca for incorporation in the shell of A. lessonii. A recently proposed calcification model can be applied to divalent cations (e.g., Mg and Sr), which compete for binding sites of ion transporters and positions in the calcite lattice. By contrast, the transport pathway of monovalent cations such as Li is probably diffusion based (e.g., ion-channels), and monovalent cations do not compete with Ca for a position in the calcite lattice. Here we present a new model for Li partitioning into foraminiferal calcite which predicts our experimental results and should also be applicable to other alkali metals.

Original languageEnglish
Pages (from-to)4275-4279
Number of pages5
JournalGeochemistry, Geophysics, Geosystems
Volume16
Issue number12
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

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Langer, G., Sadekov, A., Thoms, S., Mewes, A., Nehrke, G., Greaves, M., ... Elderfield, H. (2015). Li partitioning in the benthic foraminifera Amphistegina lessonii. Geochemistry, Geophysics, Geosystems, 16(12), 4275-4279. https://doi.org/10.1002/2015GC006134