Technical Comments

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

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Science  10 Feb 2006:
Vol. 311, Issue 5762, pp. 779b
DOI: 10.1126/science.1120977

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Watson and Harrison (Reports, 6 May 2005, p. 841) interpreted low temperatures (∼700°C) for Hadean zircons as evidence of the existence of wet, minimum-melting conditions within 200 million years of solar system formation. However, high-temperature melts (∼900°C) are zircon-undersaturated and crystallize zircon only after substantial temperature drop during fractional crystallization. Zircon thermometry cannot distinguish between low- and high-temperature Hadean igneous sources.

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