Jinningian Collisional Granite Belt in the Eastern Sector of the Central Qilian Massif and Its Implication
中祁连东段晋宁期碰撞型花岗岩及其地质意义

The Proterozoic granite belt emplaced into the Huangyuan Group a medium-and low-grade metamorphic series of the Proterozoic basement in the eastern central Qilian massif extends in a N S direction.Its geochemical features indicate that it is a syn-collisional S-type granite belt. (917±12) Ma of single-grain zircon U-Pb age constrains its emplacement age. From above it is suggested that the easten central Qilian massif had undergone Jinningian collisional orogenesis. Finally the authors discuss the geological implication of the Proterozoic syn-collisional granite belt in the easten central Qilian massif.