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Science 10 February 2006:
Vol. 311. no. 5762, p. 779
DOI: 10.1126/science.1120073
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Technical Comments

Comment on "Zircon Thermometer Reveals Minimum Melting Conditions on Earliest Earth" I

Andrew Glikson

Watson and Harrison (Reports, 6 May 2005, p. 841) proposed a model for early Earth magmatism based on crystallization temperatures of Hadean zircons. However, detrital zircon populations are skewed relative to the composition of their source terrains, Archaean isotopic and geochemical mantle signatures preclude reincorporation of Hadean continental crust into the early mantle, and the effects of early impacts should be considered.

Department of Marine and Earth Science, Australian National University, Canberra, ACT 0200, Australia

E-mail: Andrew.glikson{at}anu.edu.au

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Temperature spectra of zircon crystallization in plutonic rocks.
T. M. Harrison, E. B. Watson, and A. B. Aikman (2007)
Geology 35, 635-638
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