“…There has been a growing interest in stable isotope analyses of rare earth elements (REEs), including Ce, 16,18,28,29,52−54,61−63 Nd, 16,25,30−32,52,55,57−59,64−66 Sm, 16,33,34 Eu, 16,26,35−37 Gd, 16 Dy, 16 Er, 16,38 and Yb. 16,38 Europium displays notable variations in isotope fractionation during magmatic processes, ranging from about −0.150‰/amu to 0.100‰/amu.…”