Why is radiometric dating of sedimentary rocks rarely accurate

Samples of a meteorite called Shallowater are usually included in the irradiation to monitor the conversion efficiency from I to Xe. Views Read Edit View history. This scheme is used to date old igneous and metamorphic rocksand has also been used to date lunar samples. Chinese Japanese Korean Vietnamese. For dates up to a few million years micastektites glass fragments from volcanic eruptionsand meteorites are best used. The age that can be calculated by radiometric dating is thus the time at which the rock or mineral cooled to closure temperature. A particular isotope of a particular element is called a nuclide.

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Bispectrum of 14 C data over the last years" PDF.

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Radiometric dating

Accurate radiometric dating generally requires that the parent has a long enough half-life that it will be present in significant amounts at the time of measurement except as described below under "Dating with short-lived extinct radionuclides"the half-life of the parent is accurately known, and enough of the daughter product is produced to be accurately measured and distinguished from the initial amount of the daughter present in the material. At the beginning of the solar system, there were several relatively short-lived radionuclides like 26 Al, 60 Fe, 53 Mn, and I present within the solar nebula. The iodine-xenon chronometer [32] is an isochron technique. Generally a shorter half-life leads to a higher time resolution at the expense of timescale. This is well-established for most isotopic systems. The precision of a dating method depends in part on the half-life of the radioactive isotope involved. For rocks dating back to the beginning of the solar system, this requires extremely long-lived parent isotopes, making measurement of such rocks' exact ages imprecise.

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why is radiometric dating of sedimentary rocks rarely accurate
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