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

Summary, in English

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.

• Författare: Helena Filipsson; Joan Bernhard; Sara Lincoln; Daniel McCorkle
• Avdelning/ar: Kvartärgeologi
• Publiceringsår: 2010
• Språk: Engelska
• Sidor: 1335-1347
• Publikation/Tidskrift/Serie: Biogeosciences
• Volym: 7
• Issue: 4
• Länkar: http://dx.doi.org/10.5194/bg-7-1335-2010
• Dokumenttyp: Artikel i tidskrift
• Förlag: Copernicus GmbH
• Ämne: Geology
• Aktiv: Published
• ISBN/ISSN/Övrigt: ISSN: 1726-4189