Uranium—lead dating , abbreviated U—Pb dating , is one of the oldest  and most refined of the radiometric dating schemes. It can be used to date rocks that formed and crystallised  from about 1 million years to over 4. The dating method is usually performed on the mineral zircon. The mineral incorporates uranium and thorium atoms into its crystal structure , but strongly rejects lead.
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Science Bulletins: Zircons—Time Capsules from the Early Earth
The implications of these new Pb-isotopic ages of angrites are threefold. Our zircon U-Pb geochronology reveals that samples with the oldest zircons of Palaeozoic volcanic origin do not contain any Gondwanan-sourced zircons particularly Cambrian and Neoproteorzoic. Many have a shear fabric associated with biotite and fibrolite intergrowth. The gneisses mainly consist of quartz, plagioclase, biotite, muscovite, garnet, kyanite, and rutile.
Importantly, the U-Pb -He double dating approach allows for the differentiation between multiple possible crystallization-age sources on the basis of their subsequent tectonic evolution. The Dewey Lake red beds formation of West Texas, believed to be the youngest Permian formation in North America, has yielded high-quality paleomagnetic data Molina-Garza et al. Since zircons form in felsic igneous rocks, and no igneous rocks of Late Permian age occur in the Karoo Basin, these findings suggest significant input of volcanic material by ash falls.Laith Saleem: Can you make you know you are dating a Balkan women when?
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