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

H. Elderfield, J. Yu, P. Anand-Jha, T. Kiefer, B. Nyland

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    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[CO
    Original languageEnglish
    Pages (from-to)633-649
    JournalEarth and Planetary Science Letters
    Issue number3-4
    Publication statusPublished - 2006

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