Technical Comments

Comment on “Zircon Thermometer Reveals Minimum Melting Conditions on Earliest Earth” I

Science  10 Feb 2006:
Vol. 311, Issue 5762, pp. 779a
DOI: 10.1126/science.1120073

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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.

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