【摘要】 吉林省太古宙ＴＴＧ岩石形成于２．７～２．８Ｇａ，其母岩浆来自于下地壳角闪质岩石的部分熔融。母岩浆通过结晶分异作用形成了英云闪长质片麻岩类和花岗闪长质片麻岩类两大类岩石，早期的英云闪长质片麻岩类构成奥长花岗岩演化趋势，晚期的花岗闪长质片麻岩类则构成钙碱性演化趋势。研究表明这两种演化趋势的形成与岩浆结晶分离矿物相的种类及其比例有关。更多还原

【Abstract】 The Archean TTG rocks in Jilin province were formed in 2.7 2.8Ga.Their primary magma came from partical melting of amphibolites in deep crust.Two types of rocks of tonalitic and granodioritic gneiss were formed by primary magma through crystallization differentiation.The early tonalitic gneiss indicates trondjemitic evolutional trend and late granodioritic gneiss represents calcalkaline evolutional trend.The research shows that the formation of two different evolutional trends is related to the types and proportion of fractional phases during magma crystallization differentiation.更多还原