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Nature 441, 169-170 (11 May 2006) | doi:10.1038/441169b; Published online 10 May 2006
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Geochemistry: The noble art of recycling
Takuya Matsumoto1
Abstract
Xenon trapped beneath Earth's crust provides clues to how our planet evolved, but quantifying atmospheric contamination has been impossible. The latest analysis surmounts a barrier to our understanding.
Because of their scarcity, chemical stability and presence as many distinguishable isotopes, noble gases in Earth's mantle — the solid layer between its outer crust and liquid core — provide constraints on the origin, structure and evolution of Earth and its atmosphere. On page 186 of this issue1, Holland and Ballentine use investigations of well gases from the upper mantle to challenge an established tenet concerning noble-gas abundance: the existence of a 'subduction barrier' that prevents the noble gases from recycling into the mantle through tectonic activity.
- Takuya Matsumoto is in the Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan.
Email: matsumoto@ess.sci.osaka-u.ac.jp
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