Oxygen isotopic evidence for vigorous mixing during the Moon-forming Giant Impact

Status Report From: e-Print archive
Posted: Friday, March 18, 2016


Edward D. Young, Issaku E. Kohl, Paul H. Warren, David C. Rubie, Seth A. Jacobson, Alessandro Morbidelli
(Submitted on 15 Mar 2016)

Earth and Moon are shown here to be composed of oxygen isotope reservoirs that are indistinguishable, with a difference in {\Delta}"17O of -1 +/- 5ppm (2se). Based on these data and our new planet formation simulations that include a realistic model for 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 {\Delta}"17O within approximately 1 per mil of the terrestrial value, suggesting that these impactors were water rich.

Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Journal reference: Science, Volume 351, Issue 6272, pp. 493-496 (2016)
DOI: 10.1126/science.aad0525
Cite as: arXiv:1603.04536 [astro-ph.EP] (or arXiv:1603.04536v1 [astro-ph.EP] for this version)
Submission history
From: Seth Jacobson
[v1] Tue, 15 Mar 2016 02:59:34 GMT (952kb)

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