Evidence against a chondritic Earth

Ian H. Campbell, Hugh St C. O'Neill

Research output: Contribution to journalReview ArticleResearchpeer-review

102 Citations (Scopus)


The 142Nd/ 144 Nd 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.

Original languageEnglish
Pages (from-to)553-558
Number of pages6
Issue number7391
Publication statusPublished - 29 Mar 2012
Externally publishedYes

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