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The term U–Pb dating normally implies the coupled use of both decay schemes in the 'concordia diagram' (see below).

However, use of a single decay scheme (usually Pb) leads to the U–Pb isochron dating method, analogous to the rubidium–strontium dating method.

The dating method is usually performed on the mineral zircon.

The mineral incorporates uranium and thorium atoms into its crystal structure, but strongly rejects lead.

Uranium-238, for example, accounts for more than 99 percent of all naturally occurring uranium. A fertile material, not itself capable of undergoing fission with low-energy neutrons, is one that decays into fissile material after neutron absorption...Therefore, one can assume that the entire lead content of the zircon is radiogenic, i.e.it is produced solely by a process of radioactive decay after the formation of the mineral.Finally, ages can also be determined from the U–Pb system by analysis of Pb isotope ratios alone. Clair Cameron Patterson, an American geochemist who pioneered studies of uranium–lead radiometric dating methods, is famous for having used it to obtain one of the earliest estimates of the age of the Earth.Although zircon (Zr Si O) is most commonly used, other minerals such as monazite (see: monazite geochronology), titanite, and baddeleyite can also be used.

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