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But now imagine that some geologic event disturbs things to make the lead escape.

That would take the zircons on a straight line back to zero on the concordia diagram.

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The simplest form of isotopic age computation involves substituting three measurements into an equation of four variables, and solving for the fourth.

Dating a rock involves uranium-lead measurements on many zircons, then assessing the quality of the data.

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Unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence.

In these cases, the concordia diagram is a valuable tool.

Consider the concordia: as zircons age, they move outward along the curve.

In a 704-million-year-old rock, 235U is at its half-life and there will be an equal number of 235U and 207Pb atoms (the Pb/U ratio is 1).

In a rock twice as old there will be one 235U atom left for every three 207Pb atoms (Pb/U = 3), and so forth.

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