Discussion
206Pb/238U versus 207Pb/235U ratios when plotted yield concordant ages, also indicate :
Answer: D
Concordant ages indicate No loss or gain of radiogenic lead.
Uranium has two decay chains, 238U to 206Pb and 235U to 207Pb, with different half-lives. If a mineral such as zircon has been a closed system since it formed, both ratios give the same age, and the analysis plots on the concordia curve.
Loss of lead (through an alteration or thermal event) or gain of lead moves the point off the curve, making it discordant, and a set of discordant points defines a discordia line. So concordance shows the opposite of a lead-loss or alteration event.
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