This shows that computed radiometric ages, even isochrons, do not have any necessary relation to true geologic ages. But at the same time, it will be enriched in the elements contained in the later forming minerals, namely sodium and potassium. Closure temperatures are so high that they are not a concern. Diffusion also depends on chemical issues. So this implies some kind of chemical fractionation. The only possible conclusion, therefore, is that the half-life of U has not been constant throughout the lifetime of the granite and its zircon crystals.
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Radiometric Dating — Is It Accurate?
How much attention is paid to assumptions? And yet, they all give the same result to within a few percent. Annales Geophysicae. If the assumptions cannot be trusted, then the calculations based on them are unsound. Isochrons require more measurements than single parent-to-daughter ratios, so most dates are based on parent-to-daughter ratios.
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