Abstract
The carbon isotope composition of carbonate rocks is one parameter used to study the carbon, sulphur and oxygen cycles through geological time1,2. The understanding of these interrelated cycles is important in quantitative flux modelling of sedimentary rocks. The carbon isotope composition in the large reservoir of dissolved carbonate in ocean water is a result of mass balance between the amount of carbon in the reduced organic reservoir and the oxidized carbonate reservoir at any given stage. The reduced carbon reservoir preferentially sequesters 12C owing to biological fractionation processes. Any change in the removal ratio of oxidized/reduced carbon will be reflected by the change of the δ13C value of the oceanic carbonate system. Here we present a detailed study of the change in 13C which took place at the base of the Upper Permian Zechstein sequence.
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Magaritz, M., Turner, P. Carbon cycle changes of the Zechstein Sea: isotopic transition zone in the Marl Slate. Nature 297, 389–390 (1982). https://doi.org/10.1038/297389a0
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DOI: https://doi.org/10.1038/297389a0
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