Characteristics and Evolution of the Progressive Metamorphic Belt in Azubai Area of Altay

The Azubai area of Altay,has experienced two types regional metamorphism,the first type is regional low-temperature dynamic metamorphism and the second one belongs to regional dynamic heat flow metamorphic type.The progressive metamorphic belt to Azubai is just one of the typical representation of the latter type,in peripheral contact metamorphic belt of the granitic mass,has developed sillimanite-cordierite belt,andalusite-staurolite belt and biotite-garnet belt in turn and the intension of progressive metamorphism tend to weakened.Combines the characteristics of deformationc and metamorphism and isotope ages,we could identify three stages of deformationc and metamorphism.In the early stage,the metamorphism is characterized by typical metamorphic mineral assemblage of greenschist facies with low metamorphic temperature;The intermediate stage,mainly with regional dynamic heat flow metamorphism,the typical progressive metamorphic belt was formed;Retrogressive metamorphism occurred in the late stage.Different metamorphic types reveal different tectonic conditions and record the evolutionary history and geodynamic process in Azubai area of Altay,Xinjiang.