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This is an enormous branch of geochemistry called Geochronology. It is an accurate way to date specific geologic events.
When an unstable Uranium (U) isotope decays, it turns into an isotope of the element Lead (Pb).For example, a problem I have worked on involving the eruption of a volcano at what is now Naples, Italy, occurred 38500 years ago with a plus or minus of 300 years.So, when the materials are appropriate and one carefully avoids contamination and re setting radiometric clocks can be VERY ACCURATE. Together they provide two separate decay schemes to determine ages of crystallisation of minerals ranging from about 10 million years, up to and beyond the age of the earth at 4.55 billion years (2) (3) Harris claims that U-Pb data indicates a young earth.In so doing he makes a number of errors of understanding, interpretation and fact.
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When a single body of liquid rock crystallizes, parent and daughter elements may separate so that, once solid, the isotopic data would define a series of points, such as those shown as open circles designated R.