A culture-based calibration of benthic foraminiferal paleotemperature proxies: delta O-18 and Mg/Ca results
Author(s)Filipsson, H. L.; Bernhard, J. M.; Lincoln, Sara Ann; McCorkle, D. C.
A culture-based calibration of benthic foraminiferal paleotemperature proxies: δ18O and Mg/Ca results
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Benthic foraminifera were cultured for five months at four temperatures (4, 7, 14 and 21 °C) to establish the temperature dependence of foraminiferal calcite δ18O and Mg/Ca. Two Bulimina species (B. aculeata and B. marginata) were most successful in terms of calcification, adding chambers at all four temperatures and reproducing at 7 and 14 °C. Foraminiferal δ18O values displayed ontogenetic variations, with lower values in younger individuals. The δ18O values of adult specimens decreased with increasing temperature in all but the 4 °C treatment, exhibiting a relationship consistent with previous δ18O paleotemperature calibration studies. Foraminiferal Mg/Ca values, determined by laser ablation inductively coupled plasma mass spectrometry, were broadly consistent with previous Mg/Ca calibration studies, but extremely high values in the 4 °C treatment and higher than predicted values at two of the other three temperatures make it challenging to interpret these results.
DepartmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Copernicus Publications on behalf of the European Geophysical Society
Filipsson, H. L. et al. "A culture-based calibration of benthic foraminiferal paleotemperature proxies: [delta]18O and Mg/Ca results", Biogeosciences, 7, (2010) 1335-1347.
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