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OXYGEN ISOTOPIC HOMOGENEITY OF THE EARTH - NEW EVIDENCE

被引：53
作者：
ROBERT, F
REJOUMICHEL, A
JAVOY, M
机构：
[1] Laboratoire Géochimie des Isotopes Stables Université de Paris VII, Tour 54/64, 1er étage, 4 place Jussieu
来源：
EARTH AND PLANETARY SCIENCE LETTERS | 1992年 / 108卷 / 1-3期
关键词：
D O I：
10.1016/0012-821X(92)90055-Z
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The two oxygen isotope ratios O-18/O-16 and O-17/O-16 were analyzed in Precambrian (3.5 Gy) and modern cherts and in mantle-derived lavas. All samples exhibit oxygen isotopic compositions consistent with mass-dependent isotopic fractionation from a single reservoir and thus suggest that 3.5 Gy ago the Earth was already a well-mixed body. These results would therefore not support models of ocean accretion by cometary impact later than 3.7 +/- 0.1 Gy. New measurements on lunar rocks confirm oxygen isotopic homogeneity of the Earth-Moon system and thus suggests that the internal mixing of the two bodies pre-dates their accretion. The recent giant impact model used to explain how the Moon was formed is also compatible with our results.
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页码：1 / 9
页数：9
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