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13C Variation in Limestone On An Aquifer-Wide Scale and Its Effects On Groundwater 14C Dating Models∗

Published online by Cambridge University Press:  18 July 2016

A B Muller  and
A L Mayo
A B Muller
Affiliation:
OECD Nuclear Energy Agency, Paris, France
A L Mayo
Affiliation:
University of Colorado, Colorado Springs
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Abstract

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In modeling the initial 14C activity of ground waters, the δ13C of marine limestone is taken conventionally to vary little about 0‰ PDB. This variation was found to be 6.28‰ in samples taken over intervals from 10-2 to 105m 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.

Type
Research Article
Information
Radiocarbon , Volume 28 , Issue 3 , 1986 , pp. 1041 - 1054
Copyright
Copyright © The American Journal of Science 

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