J. Blichert-Toft and F. Albarede (2007). "Hafnium isotopes in Jack Hills zircons and the formation of the Hadean crust." EARTH AND PLANET SCI LETT 265(3-4): 686-702.

One of the fundamental issues of Earth evolution is to understand when growth of continental crust began. Constraining this question will help us date the timing of onset of plate tectonics and thus ultimately the origin of life. We have addressed this problem by dating single Hadean zircons from Jack Hills in Western Australia and comparing their inferred geochemical properties with a variety of modern rock types (MORB, OIB, plateau basalts, subduction zone lavas etc.) in order to deduce the nature of the source rock of the Jack Hills granites.