Introduction to Geochronology/U-Series Disequilibria

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238U to 206Pb decay series












Secular Equilibrium[edit]

Analyical Methods[edit]

There are a number of different analytical approaches that can be used to dtermine the U/Th and U/Pa ratio and isotopic composition of U-bearing accessory minerals. The different techniques types discussed in more detail below.

Isotope Dillution Thermal Ionisation Mass Spectrometry (ID-TIMS)[edit]

Isotope dilution where minerals are dissolved in the presence of tracer isotopes



Materials suitable for U-Th and U-Pa[edit]