13C Variation in Limestone on an Aquifer-Wide Scale and Its Effects on Groundwater 14C Dating Models
Mooney Falls Member
C 13 C 12
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CitationMuller, A. B., & Mayo, A. L. (1986). 13C variation in limestone on an aquifer-wide scale and its effects on groundwater 14C dating models. Radiocarbon, 28(3), 1041-1054.
PublisherAmerican Journal of Science
AbstractIn modeling the initial 14C activity of ground waters, the delta-13C of marine limestone is taken conventionally to vary little about 0 per mil PDB. This variation was found to be 6.28 per mil in samples taken over intervals from 10^-2 to 1^5 meters in the Mooney Falls Member of the Redwall Limestone in northern Arizona. Such a variation will cause appreciable variability in the results of all four initial activity models tested. The variability, due primarily to a numerical instability in the models dependent on this parameter, can introduce significant uncertainty into groundwater "age" calculations.