吉林省夹皮沟太古代岩石分布及变质、变形作用研究

在野外1∶10000地质填图及室内研究工作基础上,认为夹皮沟地区太古代主体岩石是中酸性侵入体(TTG),已变质成为长英质片麻岩。太古代上壳岩以包体形式分布在长英质片麻岩中。太古代岩石经历了三期变质作用和三期变形作用。太古代上壳岩经历韧性变形作用和具有麻粒岩相变质怍用,长英质片麻岩经历早期韧性变形作用和角闪岩相变质作用,而晚期经历脆—韧性变形作用和绿片岩相变质作用。低级变质作用和晚期变形作用改造、叠加早期变质作用和变形作用。

DISTRIBUTION OF THE ARCHAEOZOIC ROCKS IN JIAPIGOU, JILIN PROVINCE AND THE STUDY ON METAMORPHISM AND DEFORMATION

According to field geological mapping (scale 1:10000)and comprehensive study in laboratory,the major archaeozoic rocks are intermediate-acid intrusives, which were metamorphosed into the felsic gneisses. The Archaeozoic supracrustal rocks are distributed as inclusions in the felsic gneisses, The Archaeozoic rocks were subjected to three-stage metamorphisms and three-stage deformations.The Achean supracrustal rocks underwent ductile deformation and metamorphism with granulite facies. The felsic gneisses underwent early ductile deformation with metamor hism of amphibolite and later brittle-ductile deformation with metamorphism of green schist facies. The early metamorphism and deformation were reworked and superimposed by the lower grade metamorphism and the later deformation.