Determining the composition of the Earth

Details Determining the composition of the Earth Determining the composition of the Earth

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002natur.416...39d&link_type=abstract

Nature, Volume 416, Issue 6876, pp. 39-44 (2002).

Computer Science

99

Scientific paper

A long-standing question in the planetary sciences asks what the Earth is made of. For historical reasons, volatile-depleted primitive materials similar to current chondritic meteorites were long considered to provide the `building blocks' of the terrestrial planets. But material from the Earth, Mars, comets and various meteorites have Mg/Si and Al/Si ratios, oxygen-isotope ratios, osmium-isotope ratios and D/H, Ar/H2O and Kr/Xe ratios such that no primitive material similar to the Earth's mantle is currently represented in our meteorite collections. The `building blocks' of the Earth must instead be composed of unsampled `Earth chondrite' or `Earth achondrite'.

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