The Yinieke’agan granite mass in Qimantag,eastern Kunlun and its tectonic significance

The Yinieke’agan granite mass consists of muscovite-bearing peraluminous granites occurring as a compound mass composed of adamellite and moyite.The mass is grayish white and contains potassic feldspar, albite,oligoclase,primary muscovite,epixenoliths and relicts.A/CNK=0.99-1.34,with a mean value of 1.097.ISr=0.71199.The whole-rock Rb-Sr isochron age is 435.7 Ma.This granite mass is interpreted as a kind of syncollisional granites resulted from the crustal thickening caused by the collision between the Qaidam plate and Tarim plate during the Early Palaeozoic and melting giving rise to three phases of emplacement of the granitic magmas influenced by the mantle thermal plumes.