Zircon SIMS U/Pb geochronology of the Lushan Terrane; dating metamorphism of the southwestern terminal of the Palaeoproterozoic Trans-North China Orogen

High-resolution SIMS U-Pb dating of metamorphic zircons of the TTG gneisses, gneissic granitoid and amphibolites of the Lushan terrane, Taihua metamorphic complex, suggests that the metamorphism had taken place at least as early as approximately 1.96-1.86 Ga. These new dates, along with reference data, demonstrate that the southern and middle terranes of the Trans-North China Orogen had been involved in the continent-continent collision between the Western Block and the Eastern Block of the North China Craton. This orogenic process started as early as 1.96 Ga and lasted as late as 1.80 Ga.