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I understand that we have zircon crystals that prevent entering or leaving of nuclide or lead after forming. But how cand we understand what was the initial ratio?

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  • $\begingroup$ As you said, in the case of zircon it doesn't matter. For other methods (Rb-Sr, Sm-Nd), we use an isochron. $\endgroup$ – Gimelist Jan 19 at 10:03

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