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- W1736741262 abstract "The stable boron isotope composition (δ 11 B) of fossil foraminiferal shells is used as a paleo‐ p H recorder and is therefore one of the most promising paleocarbonate chemistry proxies (“paleoacidimetry”). One crucial question regarding this proxy is whether foraminifera record the p H of the bulk seawater or the p H of the microenvironment (diffusive boundary layer, ∼500 μm), which is strongly influenced by life processes. Here we present a novel theoretical approach to address this question by using a diffusion‐reaction model. Model results indicate that the δ 11 B in planktonic foraminifera is primarily controlled by the p H of the microenvironment. We therefore predict that the δ 11 B of different species (e.g., symbiont‐bearing versus symbiont‐barren) or of foraminifera grown in the dark and in the light should be offset from the δ 11 B of inorganic calcite. This theoretical prediction was experimentally confirmed while this paper was written [ Hönisch et al. , 2003 ]. Most importantly, the model predicts that this offset is constant over a wide p H range. Thus the use of δ 11 B as a paleo‐ p H indicator is not compromised through vital effects as modeled here." @default.
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- W1736741262 date "2003-05-27" @default.
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- W1736741262 title "Vital effects in foraminifera do not compromise the use of δ<sup>11</sup>B as a paleo-<i>p</i>H indicator: Evidence from modeling" @default.
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- W1736741262 doi "https://doi.org/10.1029/2003pa000881" @default.
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