Effect of Pb mass fractionation correction on recycling ages estimated from Pb-Nd isotope ratios

Abstract

In this study, we estimate the recycling age of the oceanic crust by combining the Nd model age and the Pb-Pb model age of the OIB classified as FOZO and HIMU. The important factor in this method is 207Pb/206Pb, but this isotope ratio changes depending on the correction method for the mass fractionation effect during measurement. Since the 207Pb/206Pb reported so far uses different methods and standard values, it is not possible to estimate the correct recycling age without evaluating the impact of the correction for the mass fractionation effect. In this presentation, we unify the mass fractionation effect correction method and report the recycling age estimated by the isotope ratio.