image: Close-up of 2.7 billion years old continental crust from Nunavik, northern Quebec showing a complex history of re-melting of oceanic-type rocks that were older than 4.2 billion years. This material relates to a paper that appeared in the March 17, 2017, issue of Science, published by AAAS. The paper, by J. O'Neil at University of Ottawa in Ottawa, ON, Canada, and colleagues was titled, "Building Archean cratons from Hadean mafic crust." view more
Credit: Véronique Villeneuve