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The use of cogenetic uranium-lead isotope systems in zircons in geochronology

Silver, Leon T. (1962) The use of cogenetic uranium-lead isotope systems in zircons in geochronology. In: Radioactive dating. International Atomic Energy Agency , Vienna, pp. 279-287.

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Among the more common natural radioactivity relationships investigated in geochronology the paired uranium-lead isotope systems have always been of interest for the multiple isotopic information yielded in a single study. Even in the earliest investigations of Nier (1939) it was apparent, however, that disagreement between the apparent ages calculated from the Pb²⁰⁶/U²³⁸ and Pb²⁰⁷/U²³⁵ ratios was a common phenomenon. It has been definitely established that, in general, errors in analytical techniques or in the accepted values of the decay constants U²³⁸ and U²³⁵ of U and U are not the sources of the more serious discrepancies. It is clear that this type of age discordance is a reflection of natural disturbances of the isotopic systems during their geologic history.

Item Type:Book Section
Additional Information:This work has been sponsored by the United States Atomic Energy Commission Contract AT(04 -3) 427. It is contribution No. 1124 of the Division of Geological Sciences, California Institute of Technology.
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Atomic Energy CommissionAT(04-3)-427
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Caltech Division of Geological Sciences1124
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ID Code:116268
Deposited By: Tony Diaz
Deposited On:12 Aug 2022 15:38
Last Modified:12 Aug 2022 15:38

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