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Some Radiocarbon Dates for Tufas of the Craven District of Yorkshire

Published online by Cambridge University Press:  18 July 2016

Allan Pentecost ,
P M Thorpe ,
D D Harkness  and
T C Lord
Allan Pentecost
Affiliation:
Division of Biosphere Sciences, King's College London, Campden Hill Road, London W8 7AH, England
P M Thorpe
Affiliation:
Geological Survey of Western Australia, Department of Mines, 66 Adelaide Terrace, Perth 6000, Western Australia
D D Harkness
Affiliation:
Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow, Scotland
T C Lord
Affiliation:
Kern Knotts, Stainforth, Settle, North Yorkshire, England
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Abstract

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14C dates of relict tufa deposits at Gordale indicated a Subboreal age when the carbonate age was corrected with empirical bedrock dilution factors ‘q’ of 0.79 or 0.85. Estimates of ‘apparent age,’ based on extrapolated δ13C values were about twice those obtained with q, and the 1σ error was large. The δ13C values of tufa samples were not correlated with carbonate age and were close to −10. Application of q values in this district requires caution as they appear to be site-specific. We recommend that wherever possible, levels of 13C and 14C are measured in the associated tufa-depositing water, and an empirical dilution factor employed.

Type
Articles
Information
Radiocarbon , Volume 32 , Issue 1 , 1990 , pp. 93 - 97
Copyright
Copyright © 1990 The American Journal of Science 

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