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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.
This means that zircon data can tell us not only when a rock formed, but also when significant events occurred during its life.
The oldest zircon yet found dates from 4.4 billion years ago.
The straight line takes the zircons off the concordia. The disturbing event affects the zircons unequally, stripping all the lead from some, only part of it from others and leaving some untouched.
The results from these zircons therefore plot along that straight line, establishing what is called a discordia. If a 1500-million-year-old rock is disturbed to create a discordia, then is undisturbed for another billion years, the whole discordia line will migrate along the curve of the concordia, always pointing to the age of the disturbance.
With 238U the Pb/U ratio grows much more slowly with age, but the idea is the same.
Sometimes I don’t want to chat with someone who only has a theoretical understanding of gender oppression.Sometimes I want to talk to someone who just gets it.– where affinity groups can be together without the presence of the oppressor – exist: so that tough conversations can be had with fewer guards up, so that you can communicate thousands of ideas in a single collective sigh, so that you can cry together with those who don’t just sympathize, but empathize.Dating a rock involves uranium-lead measurements on many zircons, then assessing the quality of the data.Some zircons are obviously disturbed and can be ignored, while other cases are harder to judge.
Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable.