Chronostratigraphy Geochronology Isotope geochemistry Law of superposition Luminescence dating Samarium—neodymium dating. In any case, there is the additional assumption in all the radioisotope dating methods of having to know the original concentrations of the daughter and index isotopes which is very significant in the U-Pb method because the original concentrations are assumed not to be zero, in contrast to the K-Ar method. Wetherill, G. Another samarium isotope, Sm, does not occur naturally, but has a relatively long half-life of Myr. Wickman, F. Tatsumoto, M. The concentration of Sm and Nd in silicate minerals increase with the order in which they crystallise from a magma according to Bowen's reaction series.
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RADIOGENIC ISOTOPE GEOLOGY
It should also be noted that Dickin71, fig. Such an error would cast doubt on the Kossert et al. There have been five more modern measurements of the Sm half-life since the s table 1. These discrepancies and variations remain unexplained, especially in the context of the U and U decay constants and half-lives. VIP settings And Su et al. Nevertheless, that Sm half-life value has been adopted by all geochronologists and cosmochronologists since that time the late s.