Stable potassium isotopes are one of the emerging non-traditional isotope systems enabled
in recent years by the advance of Multi-Collector Inductively-Coupled-Plasma Mass-
Spectrometry (MC-ICP-MS). In this review, we first summarize the geochemical and
cosmochemical properties of K, its major reservoirs, and the analytical methods of K
isotopes. Following this, we review recent literature on K isotope applications in the fields of
geochemistry and cosmochemistry. Geochemically, K is a highly incompatible lithophile …