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    Radiometric dating uranium lead

    Also, since the lead isotopes differ by less than 2% in mass, fractionation has been insignificant. We can say, plot Pb-207/Pb-204 versus U-235/Pb-204 and derive the age from an isochron plot, exactly the way Rb-Sr dating works.Modern radiometric dating methods* Uranium-lead dating method* Samarium-neodymium dating method* Potassium-argon dating method* Rubidium-strontium dating method* Uranium-thorium dating method* Radiocarbon dating method* Fission track dating method* Chlorine-36 dating method* Luminescence dating methods Uranium-lead dating method A concordia diagram as used in uranium-lead dating, with data from the Pfunze Belt, Zimbabwe.A plot of the two ratios (Pb-206/U-238) and (Pb-207/U-235) follows a curve as shown above.

    U-Pb ages are accurate to within less than 1 per cent, highly resistant to metamorphism, and are considered the most precise ages now available.Zircon is especially useful because it frequently contains uranium in substitution for zirconium, but does not incorporate lead (as shown by the absence of Lead-204).Thus all the lead in the zircon can be assumed to be radiogenic.Zircon also forms multiple crystal layers during metamorphic events, which each may record an isotopic age of the event.In situ micro-beam analysis can be achieved via laser ICP-MS or SIMS techniques.

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