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  1. Abstract

    The measured carbon isotopic compositions of carbonate sediments (δ13Ccarb) on modern platforms are commonly13C‐enriched compared to predicted values for minerals forming in isotopic equilibrium with the dissolved inorganic carbon (DIC) of modern seawater. This offset undermines the assumption that δ13Ccarbvalues of analogous facies in the rock record are an accurate archive of information about Earth's global carbon cycle. We present a new data set of the diurnal variation in carbonate chemistry and seawater δ13CDICvalues on a modern carbonate platform. These data demonstrate that δ13Ccarbvalues on modern platforms are broadly representative of seawater, but only after accounting for the recent decrease in the δ13C value of atmospheric CO2and shallow seawater DIC due to anthropogenic carbon release, a phenomenon commonly referred to as the13C Suess effect. These findings highlight an important, yet overlooked, aspect of some modern carbonate systems, which must inform their use as ancient analogs.

     
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