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Heterogeneous Hadean Hafnium: Evidence of Continental Crust at 4.4 to 4.5 Ga
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Heterogeneous Hadean Hafnium: Evidence of Continental Crust at 4.4 to 4.5 Ga
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Journal Article
Heterogeneous Hadean Hafnium: Evidence of Continental Crust at 4.4 to 4.5 Ga
2005
Overview
The long-favored paradigm for the development of continental crust is one of progressive growth beginning at [approximately]4 billion years ago (Ga). To test this hypothesis, we measured initial ¹⁷⁶Hf/¹⁷⁷Hf values of 4.01- to 4.37-Ga detrital zircons from Jack Hills, Western Australia. [epsilon][subscript Hf] (deviations of ¹⁷⁶Hf/¹⁷⁷Hf from bulk Earth in parts per 10⁴) values show large positive and negative deviations from those of the bulk Earth. Negative values indicate the development of a Lu/Hf reservoir that is consistent with the formation of continental crust (Lu/Hf [approximately] 0.01), perhaps as early as 4.5 Ga. Positive [epsilon][subscript Hf] deviations require early and likely widespread depletion of the upper mantle. These results support the view that continental crust had formed by 4.4 to 4.5 Ga and was rapidly recycled into the mantle.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science,American Association for the Advancement of Science (AAAS)
