吉林省中生代花岗岩成因系列及其构造环境

THE GENESIS OF MESOZOIC GRANITES IN JILIN PROVINCE AND ITS TECTONIC SETTING

吉林省中生代花岗岩主要侵入时代可划分为印支早期、燕山早期和燕山晚期。印支早期花岗岩（γ）属造山花岗岩系列，是西伯利亚板块与华北板块对接过程中的产物，成因类型以Ⅰ型为主；燕山早期花岗岩（γ）和燕山晚期花岗岩（γ、ＣＡ组合）属造陆隆起花岗岩系列，是环太平洋大陆边缘活化阶段的产物，成因类型为Ⅰ型和Ｓ型；燕山晚期花岗岩（γＡ组合）属非造山花岗宕系列，形成于“类裂谷大陆边缘”阶段的板内拉张环境，成因类型为Ａ型。由γ→γ、γ（ＣＡ）→γ（Ａ），岩浆作用向富碱的方向演化，反映了中生代大陆地壳成熟度的增高。

The main intrusive period of the Mesozoic granites in Jilin province can be divided into three periods ,i.e. early Indosinian ,early and late Yanshanian, Early Indosinian granites(γ )belongs to the orogenic granite series which are products during the convergence of theSiberia and North China plate,and its origin is mainlyⅠtype;early Yanshanian granites(composite γ . CA) belongs to nonorogenic granite series that formed in the intraplate exten-sional setting in rift-like continental margin stage,and its onigin is A type. The magmaticevolution is towards rich alkaline,i.e. from γ→ γ·γ(A)→γ (A),and reflect an upliftof Mesozoic continental crust in maturity.