Comment on "Zircon thermometer reveals minimum melting conditions on earliest Earth" II.

Citation data:

Science (New York, N.Y.), ISSN: 1095-9203, Vol: 311, Issue: 5762, Page: 779; author reply 779

Publication Year:
2006
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Citations 19
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Repository URL:
http://ro.uow.edu.au/scipapers/922
PMID:
16469904
DOI:
10.1126/science.1120977
Author(s):
Nutman, Allen Phillip
Publisher(s):
American Association for the Advancement of Science (AAAS)
Tags:
melting; minimum; reveals; thermometer; ii; zircon; earth; comment; earliest; conditions; GeoQUEST; Life Sciences; Physical Sciences and Mathematics; Social and Behavioral Sciences
article description
Watson and Harrison (Reports, 6 May 2005, p. 841) interpreted low temperatures (approximately 700 degrees 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 (approximately 900 degrees 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.