Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr ago

  title={Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr ago},
  author={S. Wilde and J. Valley and W. Peck and C. Graham},
No crustal rocks are known to have survived since the time of the intense meteor bombardment that affected Earth between its formation about 4,550 Myr ago and 4,030 Myr, the age of the oldest known components in the Acasta Gneiss of northwestern Canada. But evidence of an even older crust is provided by detrital zircons in metamorphosed sediments at Mt Narryer and Jack Hills in the Narryer Gneiss Terrane, Yilgarn Craton, Western Australia, where grains as old as ∼4,276 Myr have been found. Here… Expand

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