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Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
| 54309 |
Creator |
b75227dc49245aab76a534b836099ab7 |
| 54309 |
Creator |
d8b3b90e24f10b122cfbd5afecaaa40e |
| 54309 |
Creator |
84764f824834b90b789fef94138093b1 |
| 54309 |
Creator |
e432142ec58f9a10e885889240dad5b7 |
| 54309 |
Creator |
ext-8244173ae2e4ca309a98c745acbdf287 |
| 54309 |
Creator |
ext-8de519a88a566f7aab45c3b8f0598e42 |
| 54309 |
Creator |
ext-914fb1e460b86ad7f99f40b7a768a0a6 |
| 54309 |
Date |
2018-03-28 |
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Is Part Of |
repository |
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Is Part Of |
p23752548 |
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abstract |
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 Δ<sup>17</sup>O. 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 Δ<sup>17</sup>O 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. |
| 54309 |
authorList |
authors |
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issue |
3 |
| 54309 |
status |
peerReviewed |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645933 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645934 |
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uri |
http://data.open.ac.uk/oro/document/645935 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645936 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645937 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645938 |
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uri |
http://data.open.ac.uk/oro/document/645939 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645940 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645941 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645942 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645943 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/645944 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/662233 |
| 54309 |
uri |
http://data.open.ac.uk/oro/document/662741 |
| 54309 |
volume |
4 |
| 54309 |
type |
AcademicArticle |
| 54309 |
type |
Article |
| 54309 |
label |
Greenwood, Richard C. ; Barrat, Jean-Alix; Miller, Martin F. ; Anand, Mahesh ; Dauphas,
Nicolas; Franchi, Ian A. ; Sillard, Patrick and Starkey, Natalie A. (2018). Oxygen
isotopic evidence for accretion of Earth's water before a high-energy Moon-forming
giant impact. Science Advances, 4(3), article no. eaao5928. |
| 54309 |
label |
Greenwood, Richard C. ; Barrat, Jean-Alix; Miller, Martin F. ; Anand, Mahesh ;
Dauphas, Nicolas; Franchi, Ian A. ; Sillard, Patrick and Starkey, Natalie A. (2018).
Oxygen isotopic evidence for accretion of Earth's water before a high-energy Moon-forming
giant impact. Science Advances, 4(3), article no. eaao5928. |
| 54309 |
Title |
Oxygen isotopic evidence for accretion of Earth's water before a high-energy Moon-forming
giant impact |
| 54309 |
in dataset |
oro |