Trace element concentrations in zircons from ODP Holes 147-894G and 153-923A

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...

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Bibliographic Details
Main Authors: Coogan, Laurence A, Hinton, Richard W
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2006
Subjects:
147-894G
153-923A
DRILL
Drilling/drill rig
Joides Resolution
Leg147
Leg153
North Atlantic Ocean
North Pacific Ocean
Ocean Drilling Program
ODP
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.721807
https://doi.org/10.1594/PANGAEA.721807
Description
Summary: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.

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