FN Archimer Export Format
PT J
TI Oxygen isotopic evidence for accretion of Earth's water before a high-energy Moon-forming giant impact
BT 
AF GREENWOOD, Richard C.
   BARRAT, Jean-Alix
   MILLER, Martin F.
   ANAND, Mahesh
   DAUPHAS, Nicolas
   FRANCHI, Ian A.
   SILLARD, Patrick
   STARKEY, Natalie A.
AS 1:1;2:2;3:1,3;4:1,4;5:5,6;6:1;7:7;8:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Open Univ, Sch Phys Sci, Planetary & Space Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England.
   Univ Bretagne Occidentale, Inst Univ Europeen Mer, Lab Geosci Ocean, CNRS,UMR 6538, Plouzane, France.
   British Antarctic Survey, Madingley Rd, Cambridge CB3 0ET, England.
   Nat Hist Museum, Dept Mineral, Cromwell Rd, London SW7 5BD, England.
   Univ Chicago, Dept Geophys Sci, Origins Lab, 5734 South Ellis Ave, Chicago, IL 60637 USA.
   Univ Chicago, Enrico Fermi Inst, 5734 South Ellis Ave, Chicago, IL 60637 USA.
   Ctr Rech Econ & Stat, 5 Ave Henry Le Chatelier, F-91120 Palaiseau, France.
C2 UNIV OPEN, UK
   UBO, FRANCE
   BRITISH ANTARCTIC SURVEY, UK
   NHM, UK
   UNIV CHICAGO, USA
   UNIV CHICAGO, USA
   CREST, FRANCE
UM LGO
IN DOAJ
IF 12.804
TC 70
UR https://archimer.ifremer.fr/doc/00638/74995/75750.pdf
   https://archimer.ifremer.fr/doc/00638/74995/75751.pdf
LA English
DT Article
AB The Earth-Moon system likely formed as a result of a collision between two large planetary objects. Debate about their relative masses, the impact energy involved, and the extent of isotopic homogenization continues. We present the results of a high-precision oxygen isotope study of an extensive suite of lunar and terrestrial samples. We demonstrate that lunar rocks and terrestrial basalts show a 3 to 4 ppm (parts per million), statistically resolvable, difference in Delta O-17. Taking aubrite meteorites as a candidate impactor material, we show that the giant impact scenario involved nearly complete mixing between the target and impactor. Alternatively, the degree of similarity between the Delta O-17 values of the impactor and the proto-Earth must have been significantly closer than that between Earth and aubrites. If the Earth-Moon system evolved from an initially highly vaporized and isotopically homogenized state, as indicated by recent dynamical models, then the terrestrial basalt-lunar oxygen isotope difference detected by our study may be a reflection of post-giant impact additions to Earth. On the basis of this assumption, our data indicate that post-giant impact additions to Earth could have contributed between 5 and 30% of Earth's water, depending on global water estimates. Consequently, our data indicate that the bulk of Earth's water was accreted before the giant impact and not later, as often proposed. 
PY 2018
PD MAR
SO Science Advances
SN 2375-2548
PU Amer Assoc Advancement Science
VL 4
IS 3
UT 000431373300009
DI 10.1126/sciadv.aao5928
ID 74995
ER

EF