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Geology; August 2006; v. 34; no. 8; p. 633-636; DOI: 10.1130/G22737.1
© 2006 Geological Society of America
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Do the trace element compositions of detrital zircons require Hadean continental crust?

Laurence A. Coogan*,1 and Richard W. Hinton2

1 School of Earth and Ocean Sciences, University of Victoria, PO Box 3055 STN CSC, Victoria, BC V8W 2Y2, Canada
2 School of Geosciences, The King's Buildings, West Mains Road, Edinburgh University, Edinburgh EH9 3JW, UK

The trace element compositions of Hadean zircons have been used in two ways to argue for the existence of Hadean continental crust. One argument is based on low crystallization temperatures of Hadean zircons that have been determined using a novel geothermometer based on the Ti content of zircons in equilibrium with rutile. The second argument is based on using the trace element abundances in zircons to calculate their parental melt compositions, especially the rare earth elements. Here we demonstrate that zircons that grow from a melt formed by basalt differentiation at modern mid-ocean ridges cannot be unambiguously distinguished from Hadean zircons on either of these grounds. Thus, we conclude that the trace element compositions of Hadean zircons are permissive of models that do not include the generation of continental crust in the Hadean.

Key Words: Hadean • mid-ocean ridge • zircon • continental crust




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