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In uranium-lead (U-Pb) dating of zircon, the zircon is found to exclude initial lead almost completely.

Minerals too are predictable chemical compounds that can be shown to form at specific temperatures and remain closed up to certain temperatures if a rock has been reheated or altered.

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The incremental additions of the daughter type can then be viewed in proportion to the abundance of parent atoms. It has already been shown— In practice, the isochron approach has many inherent advantages.

When a single body of liquid rock crystallizes, parent and daughter elements may separate so that, once solid, the isotopic data would define a series of points in time that can be plotted along a horizontal line reflecting a common value for the initial daughter isotope ratio (.

These isotopes did not come from radioactive decay in the system but rather formed during the original creation of the elements.

In this case, it is a big advantage to present the data in a form in which the abundance of both the parent and daughter isotopes are given with respect to the abundance of the initial background daughter.In this case, a valid age can still be obtained, provided that they remain within the rock.Should a point plot below the line, it could indicate that a particular sample was open to migration of the dating elements or that the sample was contaminated and lay below the isochron when the rock solidified.Rubidium-strontium (Rb-Sr) dating was the first technique in which the whole-rock isochron method was extensively employed.Certain rocks that cooled quickly at the surface were found to give precisely defined linear isochrons, but many others did not.By careful selection, certain minerals that contain little or no daughter element but abundant parent element can be analyzed.

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