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Carbon Isotope Composition of Diagenetic Carbonate Nodules from Freshwater Swamp Sediments
Thomas Whelan, III, Harry H. Roberts
The carbon isotope composition of freshwater diagenetic carbonate nodules ranges from -9.5 (vs. NBS 20) in well-drained environments to -19.1 in poorly-drained environments of a freshwater swamp. The 13C values of carbonate nodules are not a function of depth of burial. Depositional environment determines the isotope composition.
The data from two cores taken in different sedimentary sequences suggest that in poorly-drained sections transformations of isotopically light organic matter yield carbon, which is incorporated into the diagenetic carbonate. In well-drained sections, renewal of fresh water, in which carbon species are dissolved, provides the source of carbon for diagenetic carbonate nodules.
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