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Evidence against a chondritic Earth

Author

Listed:
  • Ian H. Campbell

    (Research School of Earth Science, Australian National University)

  • Hugh St C. O’Neill

    (Research School of Earth Science, Australian National University)

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.

Suggested Citation

  • Ian H. Campbell & Hugh St C. O’Neill, 2012. "Evidence against a chondritic Earth," Nature, Nature, vol. 483(7391), pages 553-558, March.
    • Handle: RePEc:nat:nature:v:483:y:2012:i:7391:d:10.1038_nature10901
    DOI: 10.1038/nature10901
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