Bell, Elzabeth A.; Harrison, T.M.; McCulloch, Malcolm; Young, Edward D
Several lines of isotopic evidence - the most direct of which is from Hadean Jack Hills zircons - suggest a very early history of crust formation on Earth that began by about 4.5Ga. To constrain both the fate of the reservoir for this crust and the nature of crustal evolution in the sediment source region of the Jack Hills, Western Australia, during the early Archean, we report here initial176Hf/177Hf ratios and δ18O systematics for <4Ga Jack Hills zircons. In contrast to the significant number...[Show more]
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