Display options
Share it on

Science. 2016 Jan 29;351(6272):493-6. doi: 10.1126/science.aad0525.

Oxygen isotopic evidence for vigorous mixing during the Moon-forming giant impact.

Science (New York, N.Y.)

Edward D Young, Issaku E Kohl, Paul H Warren, David C Rubie, Seth A Jacobson, Alessandro Morbidelli

Affiliations

  1. Department of Earth, Planetary, and Space Sciences, University of California Los Angeles, Los Angeles, CA, USA. [email protected] [email protected].
  2. Department of Earth, Planetary, and Space Sciences, University of California Los Angeles, Los Angeles, CA, USA.
  3. Bayerisches Geoinstitut, University of Bayreuth, D-95490 Bayreuth, Germany.
  4. Bayerisches Geoinstitut, University of Bayreuth, D-95490 Bayreuth, Germany. Laboratoire Lagrange, Université de Nice-Sophia Antipolis, Observatoire de la Cote d'Azur, CNRS, 06304 Nice, France.
  5. Laboratoire Lagrange, Université de Nice-Sophia Antipolis, Observatoire de la Cote d'Azur, CNRS, 06304 Nice, France.

PMID: 26823426 DOI: 10.1126/science.aad0525

Abstract

Earth and the Moon are shown here to have indistinguishable oxygen isotope ratios, with a difference in Δ'(17)O 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'(17)O within approximately 1 per mil of the terrestrial value, limiting possible sources for this late addition of mass to the Earth-Moon system.

Copyright © 2016, American Association for the Advancement of Science.

Publication Types