Hf isotopic measurements for a mixed standard solution of which concentrations were 298.7 ng ml-1
for JMC 14375 Hf, 30.4 ng ml-1
for Accu-Trace Yb and 3.0 ng ml-1
for Accu-Trace Lu. The isobaric interference corrections were made after previous reports on Yb isotopic composition (Chu et al. 2002; McCulloch et al. 1977; Segal et al. 2003; Thirlwall & Anczkiewicz 2004; Vervoort et al. 2004). Solid and dashed lines respectively represent the average 176Hf/177Hf of JMC 14375 and 2σ S. D. on the mean for the unspiked solution.