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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Carbon Isotope Composition of Diagenetic Carbonate Nodules from Freshwater Swamp Sediments
Thomas Whelan, III, Harry H. Roberts
ABSTRACT
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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