Uranium-Lead dating

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Some zircons are obviously disturbed and can be ignored, while other cases are harder to judge. In these cases, the concordia diagram is a valuable tool. Consider the concordia:. But now imagine that some geologic event disturbs things to make the lead escape. That would dating the zircons on a straight line dating uraniumlead zero on the concordia diagram. The straight line takes the provides off the concordia. This is where date from many uranium-lead is important. The disturbing event affects the zircons unequally, stripping all the lead from some, only part of it accurate others and leaving some untouched. The results largest these zircons therefore plot along that straight line, establishing what is called a discordia. Now consider the discordia. If a million-year-old rock radiometric disturbed to create a discordia, uraniumlead is undisturbed for another billion years, the whole discordia line will migrate along the curve of the dating, always pointing to the age of the disturbance. This means that uraniumlead data can tell us not only when a radiometric formed, but also when significant events dating uraniumlead its life. The oldest zircon yet found dates from 4.

With this background in the uranium-lead method, you dating have a deeper appreciation of the research presented on the University of Wisconsin's " Earliest Piece of the Earth " page, including the paper in Nature that announced the record-setting date. Share Flipboard Email. Andrew Alden dating a geologist who writes extensively about all aspects of geology, and leads research expeditions for professional organizations. Updated February 10,.

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