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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 δ 13C values were about twice those obtained with q, and the 1σ error was large. The δ 13C 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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