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It does, however, give a maximum age of the Earth. To perform dating, a rock is crushed to a fine powder, and minerals are separated by various physical and magnetic means. E-mailHomepagePhoneFax This assumes there has been no migration of daughter or parent nuclei within the matrix since its solidification. In this case, the host mineral could have an absolute age very much older than is recorded in the isotopic record. Each mineral has different ratios between parent and daughter concentrations.

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But this presents a problem for any given material since no one can go back in time and measure that number.

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Isochron dating

Dalrymple may have a point. Zashu, Y. In other experiments muscovite was synthesized from a colloidal gel under similar temperatures and Ar pressures, the resultant muscovite retaining up to 0. It will be covered in more detail below. We can then determine the Pb ratios in other meteorites and see if they fall on a Pb-Pb isochron that passes through the initial ratios determined from troilite in Fe-meteorites.

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