SEARCH Articles Figures Tables W isotope evolution in chondrites as well as mantle and core of a differentiated planet. Shown are hypothetical core formation events at 10, 30, and 50 Myr. For the 50 Myr event the evolution curve for the core is close to zero and not shown here. Note that the Asw of chondrites is always zero. The ratio of the metal core does not change over time but its Asw value evolves to more negative values over time . Note the differences in anomalies that would develop depending on the time of core formation. [Publishers Imprint]