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Sodium, Magnesium and Strontium in the Tests of Planktonic Foraminifera

Michael L. Bender, Robert B. Lorens and Douglas F. Williams
Micropaleontology
Vol. 21, No. 4 (Oct., 1975), pp. 448-459
DOI: 10.2307/1485293
Stable URL: http://www.jstor.org/stable/1485293
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Sodium, Magnesium and Strontium in the Tests of Planktonic Foraminifera
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Abstract

We have determined Na/Ca, Mg/Ca, Sr/Ca, Al/Ca and Cl/Na atom ratios in about sixty samples of individual species of planktonic foraminifera. Na/Ca and Sr/Ca ratios are constant in different tests of one species, but Mg/Ca ratios show considerable variability. Data indicate that Na and Sr are distributed homogeneously throughout the tests, while Mg is distributed heterogeneously. Na/Ca, Mg/Ca and Sr/Ca ratios of different species from an Upper Pleistocene assemblage from the Tasman Sea covary, with shallow-living species having the highest ratios. Atom ratios of Recent North Atlantic Globigerinoides sacculifer (Brady) and G. ruber (d'Orbigny) samples do not show any clear-cut temperature dependence. It appears that at one location atom ratios increase with temperature or a temperature-related factor, and that over a broad geographical area variables other than temperature affect trace element abundance.

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