Calibrations for benthic foraminiferal Mg/Ca paleothermometry and the carbonate ion hypothesis

Details Calibrations for benthic foraminiferal Mg/Ca paleothermometry and the carbonate ion hypothesis Calibrations for benthic foraminiferal Mg/Ca paleothermometry and the carbonate ion hypothesis

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.250..633e&link_type=abstract

Earth and Planetary Science Letters, Volume 250, Issue 3-4, p. 633-649.

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Scientific paper

Benthic foraminiferal magnesium/calcium ratios were determined on one hundred and forty core-top samples from the Atlantic Ocean, the Norwegian Sea, the Indian Ocean, the Arabian Sea and the Pacific Ocean, mostly at sites with bottom water temperatures below 5 °C. Mg/Ca ratios are consistently lower, by ˜ 0.2 mmol/mol, in samples cleaned using oxidative and reductive steps than using oxidative cleaning. Differences between Cibicidoides species have been identified: Mg/Ca of Cibicidoides robertsonianus > Cibicidoides kullenbergi > Cibicidoides wuellerstorfi. Comparison with bottom water temperatures support observations of lowered Mg/Ca of C. wuellerstorfi at temperature below ˜ 3 °C compared with values predicted by published calibrations and from other Cibicidoides species. Hydrographic data shows that carbonate ion saturation (Δ[CO32-]) decreases rapidly below this temperature. An empirical sensitivity of Δ[CO32-] on Mg/Ca has been established for C. wuellerstorfi of 0.0086 ± 0.0006 mmol/mol/μmol/kg. A novel application using modern temperatures and Last Glacial Maximum temperatures derived via pore fluid modelling supports a carbonate ion saturation state effect on Mg incorporation. This may significantly affect calculated δ18Oseawater obtained from foraminiferal δ18O and Mg/Ca temperature.

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