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The short-lived $^{182}$Hf-$^{182}$W decay system is a powerful chronometerfor constraining the timing of metal-silicate separation and core formation inplanetesimals and planets. Neutron capture effects on W isotopes, however,significantly hamper the application of this tool. In order to correct forneutron capture effects, Pt isotopes have emerged as a reliable in-situ neutrondosimeter. This study applies this method to IAB iron meteorites, in order toconstrain the timing of metal segregation on the IAB parent body. The$\epsilon^{182}$W values obtained for the IAB iron meteorites range from -3.61$\pm$ 0.10 to -2.73 $\pm$ 0.09. Correlating $\epsilon^{\mathrm{i}}$Pt with$^{182}$W data yields a pre-neutron capture $^{182}$W of -2.90 $\pm$ 0.06. Thiscorresponds to a metal-silicate separation age of 6.0 $\pm$ 0.8 Ma after CAIfor the IAB parent body, and is interpreted to represent a body-wide meltingevent. Later, between 10 and 14 Ma after CAI, an impact led to a catastrophicbreak-up and subsequent reassembly of the parent body. Thermal models of theinterior evolution that are consistent with these estimates suggest that theIAB parent body underwent metal-silicate separation as a result of internalheating by short-lived radionuclides and accreted at around 1.4 $\pm$ 0.1 Maafter CAIs with a radius of greater than 60 km.

Late metal-silicate separation on the IAB parent asteroid: Constraints from combined W and Pt isotopes and thermal modelling