Earth oxygen isotopic composition

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Fig. 14.4 Oxygen isotopic composition of atmospheric species measured to date (After Thiemens, M., Ann. Rev. Earth Planet. Sci. 34, 217 (2006)). For these data, m, Equation 14.31 is approximately (0.7 < m < 0.9) indicating for these materials the fractionation is better described as anomalous rather than mass independent ...

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Bulk meteorites, the Moon and Mars lie within a few percentile above or below the terrestrial fractionation line on a three-oxygen isotope plot (see Fig. 3.1). Therefore, the oxygen isotope composition of the Sun has been assnmed to be the same as that of the Earth. This view has changed with the suggestion of Clayton (2002) that the Sun and the initial composition of the solar system are 0-rich com-... 

Franchi lA, Wright IP, Sexton AS, Pilhnger T (1999) The oxygen isotopic composition of Earth and Mars, Meteorit Planet Sci 34 657-661... 

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McKeegan K. D., Sahijpal S., Krot A. N., Weber D., and Ulyanov A. A. (2003) Preservation of primary oxygen isotopic compositions in Ca, Al-rich inclusions from CH chondrites. Earth Planet. Sci. Lett, (submitted). 

Bridges J. C., Franchi I. A., Hutchison R., Sexton A. S., and Pillinger C. T. (1998) Correlated mineralogy, chemical compositions, oxygen isotopic compositions and size of chondrules. Earth Planet. Sci. Lett. 155, 183-196. 

Figure 3 The oxygen isotopic compositions of the Earth and Moon are identical to extremely high precision and well resolved from the compositions of meteorites thought to come from Mars and Asteroid 4 Vesta (sources Wiechert et al, 2001, 2003).

Capture. This theory (Urey, 1966) proposes that the Moon was a body captured into Earth s orbit. It is dynamically difficult to do this without the Moon spiraling into the Earth and colliding. Also the Earth and Moon have indistinguishable oxygen isotope compositions (Wiechert et al, 2001) in a solar system that appears to be highly heterogeneous in this respect (Clayton, 1986). 

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