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If this is true, it makes the dating simple because if the half-lifes are correct, the dater only has to find the ratio of the amount of lead and uranium in the sample.
From what has been observed, even small amounts of rock metamorphosis should not disturb the elements in the zircon.
The four isotopes are uranium-235, uranium-238, lead-207, and lead-206.
The half-lives of the cascade from uranium-235 to lead-207 has been been extrapolated to about 704 million years and the cascade form uranium-238 to lead-206 has been calculated to about 4.47 billion years.
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