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If a magma cools quickly on the surface of the Earth, some of the Ar may be trapped. Clair Cameron Pattersonan 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. This little fact of chemistry has some profound consequences. Therefore, the Discordia line is not the result of Pb loss or U gain. Furthermore, methods for determining the slope year using experimental data were also proposed and applied to data on four samples previously described in the literature.

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Plot of the slope k versus time t.

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Uranium–lead dating

Stephen A. The mean slope for all the n points is then. A method for determining the slope year for the U-Pb dating method and initial 7 Pb concentrations in samples was described. This difficulty can be overcome in the following manner. Jon Fleming. As time increases, the three points plot on discordant lines with different slopes, and the slope of each line decreases from 0. If only partial loss of Ar occurs then the age determined will be in between the age of crystallization and the age of metamorphism.

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