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The 235U–207Pb cascade has a half-life of 704 million years and the 238U–206Pb cascade is considerably slower, with a half-life of 4.47 billion years.
So when a mineral grain forms (specifically, when it first cools below its trapping temperature), it effectively sets the uranium-lead "clock" to zero.
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.
Dating a rock involves uranium-lead measurements on many zircons, then assessing the quality of the data.
The answers he brings may be different from anything you’ve heard before.Uranium comes in two common isotopes with atomic weights of 235 and 238 (we'll call them 235U and 238U).Both are unstable and radioactive, shedding nuclear particles in a cascade that doesn't stop until they become lead (Pb).”The goal of this series of articles, beginning with this introduction, is to provide our readers with a place to bring those questions.
Scott Croft is an elder at Capitol Hill Baptist Church where he teaches a seminar on friendship, courtship and marriage.
Other minerals sometimes used for uranium-lead dating include monazite, titanite and two other zirconium minerals, baddeleyite and zirconolite.