Approximately three-quarters of the elements in the Periodic Table have two or more isotopes. RiMG volumes 16 and 43 were devoted to H, C, O, and S isotope variations, and B isotope variations were discussed in RiMG volume 33. The importance of these elements to geochemistry may be illustrated by a GeoRef search of O isotope publications, which yields over 25,000 papers, theses, and abstracts spanning over five decades. Isotopic variations of the remaining 56 elements that have two or more isotopes, however, remains relatively little explored, but is gaining rapid attention, in part driven by advances in analytical instrumentation...

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