THE Sm-Nd ISOTOPIC AGE OF C-TYPE ECLOGITE FROM THE DABIE GROUP IN THE NORTHERN DABIE MOUNTAINS AND ITS TECTONIC IMPLICATION

Qinling-Dabieshan orogenic belt is generally believed to be a collision zone between the North China Block (NCB) and the Yangtze Block (YB). Various high P/T metamorphic rocks, such as blueschist, C-type eclogite, are well developed along the suture in this belt.Precise dating of the eclogite has very important significance for understanding of the collision time between the NCB and the YB and the evolutionary history of the orogenic belt.