a World map showing Archaean cratons in dark grey (modified from ref. 23). Coloured circles show Eoarchaean cratons with data plotted in panels b and c. Eoarchaean cratons preserving Hadean zircons, radiogenic Pb, or 142Nd isotopic signatures are labelled ‘h’. b Zircon εHf(t)–time plots for Archaean cratons that record a link between a step-shift in Hf isotope evolution and the preservation of evolved rocks. Black vertical line marks the age of the oldest rock dated by U–Pb zircon geochronology. Dashed grey vertical line shows the Hadean–Eoarchaean boundary. The Hf isotopic evolution of the Hadean mafic crustal reservoir documented in the Yilgarn Craton is shown in red. c Box plots of zircon εHf(t) data from the oldest TTGs in different Eoarchaean cratons. Box limits define upper and lower quartiles, the thick horizontal line shows the mean, whiskers show 1.5 x interquartile range, points show individual analyses. Horizontal grey bars show chondritic reference values ±0.5 and ±1 εHf units. See Supplementary Note 1 for sources and details of compiled data.