Oceanic <i>p</i>H control on the boron isotopic composition of foraminifera: Evidence from culture experiments

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<jats:p>Culture experiments were carried out with the species <jats:italic>Orbulina universa</jats:italic> at four different <jats:italic>p</jats:italic>H values (7.70±0.05, 8.15±0.05, 8.60±0.05, and 9.00±0.10) in order to establish the <jats:italic>p</jats:italic>H‐dependence of boron isotope fractionation between seawater and foraminifera. A clear relationship between the boron isotopic composition of the foraminifera and the <jats:italic>p</jats:italic>H of the seawater culture solutions was found, showing heavier boron isotopic composition at higher <jats:italic>p</jats:italic>H. This finding supports the viability of boron isotopes as a paleo‐<jats:italic>p</jats:italic>H tool. It is important to note that <jats:italic>Orbulina universa</jats:italic> cultured in natural seawater, as well as those obtained from coretop samples, have a significantly lighter boron isotopic ratio than <jats:italic>Globigerinoides sacculifer</jats:italic> from coretop samples, suggesting that at least for this species, a vital effect is active.</jats:p>

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  • Paleoceanography

    Paleoceanography 11 (5), 513-517, 1996-10

    American Geophysical Union (AGU)

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