Evidence against a chondritic Earth

Ian H. Campbell () and Hugh St C. O’Neill
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Ian H. Campbell: Research School of Earth Science, Australian National University
Hugh St C. O’Neill: Research School of Earth Science, Australian National University

Nature, 2012, vol. 483, issue 7391, 553-558

Abstract: Abstract The 142Nd/144Nd ratio of the Earth is greater than the solar ratio as inferred from chondritic meteorites, which challenges a fundamental assumption of modern geochemistry—that the composition of the silicate Earth is ‘chondritic’, meaning that it has refractory element ratios identical to those found in chondrites. The popular explanation for this and other paradoxes of mantle geochemistry, a hidden layer deep in the mantle enriched in incompatible elements, is inconsistent with the heat flux carried by mantle plumes. Either the matter from which the Earth formed was not chondritic, or the Earth has lost matter by collisional erosion in the later stages of planet formation.

Date: 2012
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DOI: 10.1038/nature10901

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