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The relationship between shell size and Mg/Ca, Sr/Ca, ?18O, and ?13C of species of planktonic foraminifera

The relationship between shell size and Mg/Ca, Sr/Ca, ?18O, and ?13C of species of planktonic foraminifera
The relationship between shell size and Mg/Ca, Sr/Ca, ?18O, and ?13C of species of planktonic foraminifera
The relationship between shell size and Mg/Ca, Sr/Ca, ?18O, and ?13C of planktonic foraminiferal calcite has been investigated using seventeen species in six different size fractions. Mg/Ca increases and Sr/Ca decreases with increasing size, except for two globorotaliid species which show the opposite trend. The changes in Mg/Ca broadly follow ?18O calcification temperatures except that surface and near-surface dwelling species show larger changes in Mg/Ca than can be accounted for by differences in calcification temperature derived from ?18O. The increases in Mg/Ca and decreases in Sr/Ca vary linearly with the well-established increase in ?13C with size. This is consistent with smaller individuals calcifying faster than larger individuals and larger individuals forming calcite that more closely reflects seawater temperature and composition. It appears that variations in calcification rate affect Mg and Sr shell chemistry. The observations may account for part of the temporal variability in foraminiferal Sr/Ca within a single size fraction that has been attributed to changes in seawater Sr/Ca.

1525-2027
art.1052
Elderfield, H.
fe3fae5f-0b4b-4741-a100-3aaa75568f06
Vautravers, M.
cd741157-4e2b-449e-80b5-b8900080e25e
Cooper, M.
54f7bff0-1f8c-4835-8358-71eef8529e7a
Elderfield, H.
fe3fae5f-0b4b-4741-a100-3aaa75568f06
Vautravers, M.
cd741157-4e2b-449e-80b5-b8900080e25e
Cooper, M.
54f7bff0-1f8c-4835-8358-71eef8529e7a

Elderfield, H., Vautravers, M. and Cooper, M. (2002) The relationship between shell size and Mg/Ca, Sr/Ca, ?18O, and ?13C of species of planktonic foraminifera. Geochemistry, Geophysics, Geosystems, 3 (8), art.1052. (doi:10.1029/2001GC000194).

Record type: Article

Abstract

The relationship between shell size and Mg/Ca, Sr/Ca, ?18O, and ?13C of planktonic foraminiferal calcite has been investigated using seventeen species in six different size fractions. Mg/Ca increases and Sr/Ca decreases with increasing size, except for two globorotaliid species which show the opposite trend. The changes in Mg/Ca broadly follow ?18O calcification temperatures except that surface and near-surface dwelling species show larger changes in Mg/Ca than can be accounted for by differences in calcification temperature derived from ?18O. The increases in Mg/Ca and decreases in Sr/Ca vary linearly with the well-established increase in ?13C with size. This is consistent with smaller individuals calcifying faster than larger individuals and larger individuals forming calcite that more closely reflects seawater temperature and composition. It appears that variations in calcification rate affect Mg and Sr shell chemistry. The observations may account for part of the temporal variability in foraminiferal Sr/Ca within a single size fraction that has been attributed to changes in seawater Sr/Ca.

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Published date: 2002

Identifiers

Local EPrints ID: 58414
URI: http://eprints.soton.ac.uk/id/eprint/58414
ISSN: 1525-2027
PURE UUID: 11c99a49-958b-4119-92f5-d3c73155c323
ORCID for M. Cooper: ORCID iD orcid.org/0000-0002-2130-2759

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Date deposited: 13 Aug 2008
Last modified: 10 Nov 2021 03:02

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Contributors

Author: H. Elderfield
Author: M. Vautravers
Author: M. Cooper ORCID iD

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