摘要
The high pressure metamorphic belt in central Qiangtang consists of eclogite, glaucophane schist and garnet-muscovite schist. In this paper, the authors focus on the eclogites in Pianshishan and Guoganjianianshan area. The Pianshishan eclogites enclosed within garnet-muscovite schist have peak metamorphic p-T conditions at T=500℃ and p=2.3 GPa.The ages ranging between 230 and 244 Ma are given by U-Pb dating of zircons and Lu-Hf datings,and were interpreted as the peak metamorphic age of eclogites. Ar-Ar datings of eclogites and their country rocks gave similar ages ranging between 210 and 220 Ma, representing the cooling age of the eclogites during retrograde metamorphism.