Technical Comments

Response to Comments on "Zircon Thermometer Reveals Minimum Melting Conditions on Earliest Earth"

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Science  10 Feb 2006:
Vol. 311, Issue 5762, pp. 779
DOI: 10.1126/science.1121080

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The mean crystallization temperature of Hadean zircons estimated on the basis of titanium content is ∼680°C. This value corresponds almost uniquely to the temperature of wet minimum melting in present-day crust. The low variance of the temperature distribution (±25°C) also points unequivocally to Hadean zircon growth under conditions that were highly reproducible and thermally regulated. Eutectic-like melting is particularly capable of providing such regulation and is consistent with Hadean zircon growth during wet crustal fusion.

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