抄録
Blueschists accompanied by greenschists and pelitic schists occur along the Xiguitu-Tayuan fault in the Toudaoqiao area, northeastern China. The amphiboles in the blueschists are zoned from barroisite through winchite and magnesioriebeckite/glaucophane to winchite. The peak metamorphic conditions are defined by the mineral assemblages of magnesioriebeckite/glaucophane, epidote, high-Si phengite (Si<7.1), chlorite, albite, hematite and quartz. The P-T conditions are estimated as P = 400-450°C and T = 12-13kbar. The occurrence of the blueschists along the Xiguitu-Tayuan fault strongly suggests the fault is the suture between the Ergun and the Xing`an blocks situated in the eastern portions of the CAOB.
