| Abstract: | Thick Neoproterozoic strata are widespread in the Dalian region, Liaodong Peninsula, Northeast China. SHRIMP zircon U-Pb dating
of dolerite intruded into Neoproterozoic strata gives its emplacement age as 211 ±2 Ma. However, abundant 0.9–1.1 Ga zircons
are identified in the dolerite. The age of 1125 ±38 Ma corresponds with the Grenvillian collisional event. The zircons of
904 ±15 Ma ages have high Th/U ratios (1.31–2.25) and magmatic oscillatory zones, being possibly related to later magmatism
induced during amalgamation of Rodinia. |
