The zircons were obtained from ash layers located in central and southeastern China.
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The method relies on two separate decay chains, the uranium series from U to Pb, with a half-life of 4. The existence of two 'parallel' uranium-lead decay routes allows several dating techniques within the overall U-Pb system.
The term 'U-Pb dating' normally implies the coupled use of both decay schemes. However, use of a single decay scheme usually U to Pb leads to the U-Pb isochron dating method, analogous to the rubidium - strontium dating method.
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Finally, ages can also be determined from the U-Pb system by analysis of Pb isotope ratios alone. This is termed the lead -lead dating method.
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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 accurate estimates of the age of the Earth. Uranium-lead dating is usually performed on the mineral zircon ZrSiO 4 , though it can be used on other minerals. Zircon incorporates uranium and thorium atoms into its crystalline structure, but strongly rejects lead.