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29-Oct-2019 09:24

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).In this article we shall discuss the basis of the U-Pb and Pb-Pb methods, and also fission track dating.The reader will find this article much easier to grasp if s/he has already mastered the material in the articles on K-Ar dating, Ar-Ar dating, and Rb-Sr dating.Planetary scientists maintain that they should, for reasons which are somewhat beyond the scope of this textbook.Another reason for believing it is that if we calculate Pb-Pb dates on this basis, the dates we get are in agreement with dates produced by other methods where they can be applied: this would hardly be possible if we were using the wrong figures for the initial lead isotope ratios.

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; as you can see from its chemical formula, it is one of the silicate minerals.Pb (lead-204), which is neither unstable nor radiogenic.