Oxygen isotopic evidence for vigorous mixing during the Moon-forming giant impact Journal Article uri icon

DCO ID 11121/8908-6233-3367-1081-CC

is Contribution to the DCO

  • YES

year of publication

  • 2016

abstract

  • Earth and the Moon are shown here to have indistinguishable oxygen isotope ratios, with a difference in Δ′17O of −1 ± 5 parts per million (2 standard error). On the basis of these data and our new planet formation simulations that include a realistic model for primordial oxygen isotopic reservoirs, our results favor vigorous mixing during the giant impact and therefore a high-energy, high-angular-momentum impact. The results indicate that the late veneer impactors had an average Δ′17O within approximately 1 per mil of the terrestrial value, limiting possible sources for this late addition of mass to the Earth-Moon system.

volume

  • 6272