Extended Data Fig. 1: Photomicrographs of the NWA 7034 zircons analysed in this study taken under natural light.

Given the small size and limited number of zircons recovered from the crushing process, we considered it to be preferable not to conduct additional imaging (using cathodoluminescence) because this necessitates extra manipulation of the individual grains, thereby increasing the risk of losing zircons. The fact that the zircons have mostly concordant U–Pb ages confirms their simple igneous history and, therefore, additional imaging to investigate potential zoning is not required here.