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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 43 (1973)No. 1. (March), Pages 54-58

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^pmil (vs. NBS 20) in well-drained environments to -19.1^pmil in poorly-drained environments of a freshwater swamp. The ^dgr13C 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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