A Comparison of Radiocarbon and U/Th Ages on Continental Carbonates
- 1 January 1992
- journal article
- Published by Cambridge University Press (CUP) in Radiocarbon
- Vol. 34 (3) , 602-610
- https://doi.org/10.1017/s0033822200063888
Abstract
Authigenic micrite from a playa in the northern Sahara has been dated by both the U/Th and 14C methods. The U/Th ages can be a few thousand years greater or less than the 14C ages obtained on the smallest crystals of micrite. The latter are considered to form a reasonable chronology for the Holocene deposits. The deviations of the U/Th ages are explained by quantifiable losses and gains of uranium under changing redox conditions. Under conditions where U is conservative (reduced sediments with low permeability), the U/Th method can provide good chronologies for lacustrine deposits.Keywords
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