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    U pb dating

    Now since all rocks are somewhat porous, and since we are pretty much obliged to date rocks from near the surface, it's hard to find instances in which uranium has not been lost.; as you can see from its chemical formula, it is one of the silicate minerals.Since we know the ratios in which the various lead isotopes are usually found, we can then apply the same sort of correction we used to account for atmospheric argon in the K-Ar method.While zircon has been the most popular mineral for U-Pb dating, other minerals have been employed, including apatite, monazite, titanite, allanite and, most interesting of all, xenotime.

    It is now clear that with recent advances the uranium–lead method is superior in providing precise age information with the least number of assumptions. Different schemes have been developed to deal with the critical assumptions stated above.If, for example, we apply U-Pb dating to a grain of zircon found in sandstone, we aren't dating the formation of the sandstone, we're dating the formation of the granite that the zircon came from; all we could say about the sandstone is that it must be younger than that.However, it is possible to put a date on some sedimentary rocks using the mineral xenotime (YPO).Second, zircons are durable and chemically inert, able to resist chemical weathering and even high-grade metamorphism up to about 900 °C.Zircons, then, are relatively immune to the problems that make isochron U-Pb dating so difficult.

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