Bulk Chondrule Stable Isotope Compositions
Channel: Dominik Hezel
Date: 2023-04-12

Chondrule populations of individual chondrites vary in their isotopic compositions. Reported relative deviations of chondrules from standards for the light isotopes up to 18O – and including 41K – range between about -25 to +20‰, and between -134 to +164‰ in the case of 15N. Reported values for all other stable isotope systems are significantly lower, typically ranging between -2 and +1‰, with two chondrules reaching almost -4‰ (88Sr and 114Cd). Isotope data plotting on mass fractionation trends are most likely the result of mass dependent processes. In contrast, isotopes that plot off their mass fractionation trends are in most cases (except for e.g., O isotopes) the result of mixing nucleosynthetic component to the chondrules (cf. ›mass independent fractionation‹).