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Nature 433, 25-26 (6 January 2005) | doi:10.1038/433025a; Published online 5 January 2005

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Geochemistry:  Neon illuminates the mantle

David W. Graham1

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The outer Earth grew largely from material added by impacts from planetesimals, rather than by capture of dust grains from the solar nebula — or at least that's the inference from the latest geochemical analyses.

A record of Earth's formation and its evolutionary history during the past 4,500 million years is preserved within the chemical and isotopic composition of the mantle. Fluids and the magmas expelled at the Earth's surface as basalt rocks provide samples for deciphering this record.

  1. David W. Graham is at the College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA.
    e-mail: Email: dgraham@coas.oregonstate.edu

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