In a vacuum state, the dating of this mineral would be easy and straightforward. Experience with the results of the uranium—lead method for zircons has demonstrated an interesting paradox. Case Study: Geology Recent edits by: This is termed the lead—lead dating method.
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Pb leakage is the most likely cause of discordant dates, since Pb will be occupying a site in the crystal that has suffered radiation damage as a result of U decay.
Studying mass extinctions. Thus, if we start out with 1 gram of the parent isotope, after the passage of 1 half-life there will be 0. To see how it works, we'll start at the beginning, using uranium as an example:. This gives us only a minimum age of the Earth.