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High precision measurements of Mg/Ca and Sr/Ca ratios in carbonates by cold plasma inductively coupled plasma quadrupole mass spectrometry
- C SHEN, H CHIU, H CHIANG, M CHU, K WEI, S STEINKE, M CHEN, Y LIN, L LO,
- Original article citation: Chemical Geology 236," 339 - 349, (2007).
- Categories: Earth & Environment and Chemistry
- Recommended by: Samia Mantoura on 02/08/2007 01:44PM GMT
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Mg/Ca and Sr/Ca ratios in foraminiferal carbonates are regularly used by marine geochemists to reconstruct past ocean temperature. The authors of this paper present a new analytical method for the measurement of the trace levels of these elements by ICP-QMS. Previous problems such as interferences from 86Sr have been addressed and furthermore the method uses small amounts of sample - an important achievement given the laborious hand picking of microscopic foraminifera samples. Modern temperatures calculated from foraminiferal Mg/Ca from the South China Sea are close to those measured instrumentally. Analysis of glacial and interglacial foraminifera yields a sea surface temperature change of 3 degrees C.
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