Radioactive dating metamorphic rocks

In spite of this, the three different radioisotope methods give three very different ‘ages’—that is the ‘isochron discordance’ is pronounced. For example, if accelerated radioisotope decay occurred, then alpha-decaying radioisotopes would yield older isochron ‘ages’ than beta-decaying radioisotopes.

Geologists justify this, saying that some geochemical alteration in the past disturbed the radioisotopes in those samples.Clearly, there is a problem with the assumptions on which the K-Ar ‘ages’ are calculated.The isotopic results other than potassium-argon (K-Ar), namely rubidium-strontium (Rb-Sr), samarium-neodymium (Sm-Nd) and lead-lead (Pb-Pb), were used to calculate ages for the rock formation utilizing isochrons.It is important to realize that the laboratories do not measure the ‘age’ of the rocks but the isotopes in them at the present time.

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  • Radioactive Dating - Earth Sci profil de paulette60


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