A culture-based calibration of benthic foraminiferal paleotemperature proxies: δ18O and Mg/Ca results

Helena Filipsson, Joan Bernhard, Sara Lincoln, Daniel McCorkle

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Abstract

Benthic foraminifera were cultured for five months at four temperatures (4, 7, 14 and 21 degrees C) to establish the temperature dependence of foraminiferal calcite delta O-18 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 degrees C. Foraminiferal delta O-18 values displayed ontogenetic variations, with lower values in younger individuals. The delta O-18 values of adult specimens decreased with increasing temperature in all but the 4 degrees C treatment, exhibiting a relationship consistent with previous delta O-18 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 degrees C treatment and higher than predicted values at two of the other three temperatures make it challenging to interpret these results.
Original languageEnglish
Pages (from-to)1335-1347
JournalBiogeosciences
Volume7
Issue number4
DOIs
Publication statusPublished - 2010

Subject classification (UKÄ)

  • Geology

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