The impact of Mg contents on Sr partitioning in benthic foraminifers

Mewes, Antje and Langer, Gerald and Reichart, Gert-Jan and de Nooijer, Lennart Jan and Nehrke, Gernot and Bijma, Jelle (2015) The impact of Mg contents on Sr partitioning in benthic foraminifers. Chemical Geology, 412. pp. 92-98. ISSN 0009-2541 DOI 10.1016/j.chemgeo.2015.06.026

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Abstract

Foraminiferal calcite Mg/Ca (Mg/CaCC) is used in paleoceanographic studies to reconstruct temperature. Furthermore, the Mg/CaCC is influenced by different seawater Mg/Ca (Mg/CaSW). Foraminiferal calcite Sr/Ca (Sr/CaCC) can potentially be used to reconstruct Sr/Ca ratios of seawater (Sr/CaSW). As these elements are the most abundant of all elements incorporated into the calcium carbonate of the foraminiferal tests, they potentially might affect each other's incorporation. To investigate the effects of the Mg concentration in the test on Sr incorporation, we conducted a culture study with two species of benthic foraminifera producing carbonate tests with different Mg content. Foraminifers grew under controlled conditions in different Mg/CaSW, whereas Sr/CaSW was kept constant. By analyzing Sr/CaCC of cultured specimens with laser ablation�inductively coupled plasma�mass spectrometry (LA�ICP�MS), we show that Sr/CaCC increases with increasing Mg/CaCC. We explain this observation by a stress in the crystal lattice, caused by elevated Mg/CaCC, which may be compensated for by the additional incorporation of Sr. We discuss this finding in the context of biomineralization and evaluate the reliability of Sr/CaCC as a possible Sr/CaSW proxy.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA70; weekly list
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Chemical Geology
Volume: 412
Page Range: pp. 92-98
Identification Number: 10.1016/j.chemgeo.2015.06.026
Depositing User: Sarah Humbert
Date Deposited: 16 Jan 2016 19:20
Last Modified: 16 Jan 2016 19:20
URI: http://eprints.esc.cam.ac.uk/id/eprint/3518

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