Oxygen isotopic homogeneity of the Earth: new evidence

Details Oxygen isotopic homogeneity of the Earth: new evidence Oxygen isotopic homogeneity of the Earth: new evidence

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.108....1r&link_type=abstract

Earth and Planetary Science Letters, Volume 108, Issue 1-3, p. 1-9.

Computer Science

21

Scientific paper

The two oxygen isotope ratios 18O/16O and 17O/16O 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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