U-Pb zircon ages of the rocks in the north dabie terrain, China

摘要

U-Pb zircon ages of four samples, two TTG gneisses, one metasediment and one dyke of granite-porphyry from North Dabie Terrain, were determined. The dates obtained suggest that the protolith emplacement time of TTG gneiss was about 800 Ma, but not in Early Cretaceous. The 120-130 Ma thermal event strongly disturbed U-Pb isotopic systematics of TTG gneisses and metasediments. But this thermal event lasted only for a short time.