The granulite facies Al-rich gneiss has the metamorphic assemblage of Cord+Gt+Sill+Bi+Kf+Pl+Q that is the character of low pressure granulite facies metamorphism.

• 麻粒岩相变质作用以富铝片麻岩中出现Gt+Cord+Sill+Kf+Bi等矿物组合为标志，为低压变质作用特征。