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Samarium—neodymium dating is a radiometric dating method useful for determining the ages of rocks and meteorites , based on the radioactive decay of a long-lived samarium isotope Sm to a radiogenic neodymium isotope Nd. Neodymium isotope ratios together with samarium-neodymium ratios are used to provide information on age information and the source of igneous melts. It is sometimes assumed that at the moment when crustal material is formed from the mantle the neodymium isotope ratio depends only on the time when this event occurred, but thereafter it evolves in a way that depends on the new ratio of samarium to neodymium in the crustal material, which will be different from the ratio in the mantle material. Samarium—neodymium dating allows us to determine when the crustal material was formed. The usefulness of Sm—Nd dating stems from the fact that these two elements are rare earth elements and are thus, theoretically, not particularly susceptible to partitioning during sedimentation and diagenesis. In many cases, Sm—Nd and Rb—Sr isotope data are used together.
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Uranium-Lead Dating

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Sm–Nd Dating

Samarium—neodymium dating uses the radioactive decay of Sm to Nd and Sm to Nd to measure the age of rocks and minerals and to trace and date geochemical processes responsible for the chemical differentiation of the Earth and the terrestrial planets and planetesimals. Introduced to the geochemical and cosmochemical communities in the early s, the Sm—Nd radioactive decay systems have grown into essential tools in geochronology and particularly for the tracing of geochemical processes. As a result, their fractionation from one another during silicate rock melting and crystallization is predictable. In addition,
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