Abstract
Non-traditional stable isotopes is a broad term used to encompass isotope systems other than those of H, C, N, O, and S; limited isotopic fractionation in these elements is often challenging to quantify and resolve in terrestrial and extraterrestrial materials. The field of stable isotope geochemistry has advanced rapidly with the developing capability to make high-precision measurements using multi-collector inductively-coupled-plasma mass spectrometry (MC-ICPMS) at high mass-resolution. The ability to resolve small isotopic variations in nature has stimulated numerous studies over the past two decades. This contribution summarizes the nomenclature and analytical methods commonly employed for non-traditional stable isotope analysis, followed by principal mechanisms and processes of isotope fractionation. Important applications in fundamental planetary and geological topics are illustrated using a selection of isotope systems, and directions are provided for future research in this still-developing field.
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