Figure 1

Histograms of ages (a) and zircon δ18O values (b) for Mesozoic mafic igneous rocks in the Dabie-Sulu orogenic belt and its adjacent areas in the southeastern margin of the North China Block.
A few zircon cores of Neoproterorozic and Triassic U-Pb ages are present as relicts in voluminous synmagmatic zircon grains of Early Cretaceous U-Pb ages (insert in Fig. 1a).