A Comparison of Radiocarbon and U/Th Ages on Continental Carbonates
MetadataShow full item record
CitationFontes, J.-C., Andrews, J. N., Causse, C., & Gibert, E. (1992). A comparison of radiocarbon and U/Th ages on continental carbonates. Radiocarbon, 34(3), 602-610.
DescriptionFrom the 14th International Radiocarbon Conference held in Tucson, AZ, May 20-24, 1991.
AbstractAuthigenic 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.