Li partitioning in the benthic foraminifera Amphistegina lessonii
Langer, Gerald (Cambridge University. Department of Earth Sciences)
Sadekov, Aleksey (Cambridge University. Department of Earth Sciences)
Thoms, Silke (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung)
Mewes, Antje (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung)
Nehrke, Gernot (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung)
Greaves, Mervyn (University of Cambridge. Department of Earth Sciences)
Misra, Sambuddha (University of Cambridge. Department of Earth Sciences)
Bijma, Jelle (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung)
Elderfield, Henry (Cambridge University. Department of Earth Sciences)

Data:	2015
Descripció:	5 pàg.
Resum:	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.
Ajuts:	European Commission 267931
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Biomineralization ; Foraminifera ; Li partitioning
Publicat a:	Geochemistry, geophysics, geosystems, Vol. 16, issue 12 (December 2015) , p. 4275-4279, ISSN 1525-2027

DOI: 10.1002/2015GC006134

5 p, 280.5 KB

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