New U-Pb constraints on the age of the Little Dal Basalts and Gunbarrel-related volcanism in Rodinia

The sample of diabase also yielded a single 207Pb/206Pb 1565.7 ± 1.5 Ma xenocrystic zircon with a model Th/U ratio of 0.47 indicative of a crustal origin. Although there is limited evidence for felsic magmatism, metamorphism, and orogenesis of this age in western Laurentia, a range of felsic volcanic rocks and/or intrusive suites of this age do occur in southern, central and eastern Australia, supporting existing reconstructions of the Nuna/Columbia supercontinent that place the northwest margin of Laurentia adjacent to Australia.