The relative abundance of 87Sr varies due to the radiogenic decay of 87Rb.
This variation depends on the sr nd dating of Rb present in the sample, the time elapsed since its formation and the Sr isotope composition initially present in the sample. This type of study is based on the fact that the amount of 87Sr has been increasing since the origin of the Earth due to the contributions from the decay of 87Rb and the geochemical behavior of Rb and Sr.
Sr isotopic analysis can be performed for studies in geochronology, petrology, marine-carbonate dating, diagenesis, sr nd dating, and archaeology. The combination of epsilon-Nd and Sr data is a powerful tool for isotope geochemistry studies in geological materials, reflecting their origin and sometimes enabling quantification of the proportion of different materials that have contributed to their genesis.
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Nd isotope ratios, when suitably sr nd dating, are used in dating metamorphic and magmatic rocks by internal isochrons, based on cogenetic minerals, and can provide useful information in petrological and metal ores studies. LEAD Lead has four natural isotopes with atomic masses, and Only Pb is naturally stable, while the other three click the result of the radioactive decay from U, U and Th, respectively.
The Common Lead method has been used, mainly in the field of geosciences, for determining the model ages in galenas and cerussite, as well as an isotopic tracer in feldspars.
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Over the last decade, there has been a considerable development of common lead analysis, as it can be extremely important in environmental studies as a useful tracer for contamination processes.