吉林省柳河地区太古宙构造片麻岩地质特征及成因讨论

A DISCUSSION ON GEOLOGICAL FEATURES OF THE ARCHEANTECTONIC GNEISS IN THE LIUHE AREA,JILINPROVINCE AND ITS ORIGIN

在柳河地区开展１∶５万区调工作中，对测区内的柳树河子片麻岩做了较为详细的工作。结果认为，该片麻岩在地质特征、岩石粒度结构及成因等诸方面与传统认识上的纯区域变质作用所形成的片麻岩有较大的差异。该片麻岩系由太古宙侵入岩经动力变质作用、静态重结晶作用而形成的构造片麻岩类。其岩石构造具多样性、粒度结构具不均匀性，并具发育的变余应变结构。岩石结构和构造在空间分布上具有一定的分带性。笔者还根据构造片麻岩特有的结构提出了“变余应变结构”这一新的结构术语，并对构造片麻岩的分类命名提出了初步意见。

On the basis of the regional geological surveying(1∶50 000)in the Liuhe area, Jilin province,the Liushuhezi gneiss is studied in relatively detail.The gneiss is quite different from the common gneiss formed by euregional metamorphic deformation on geological features,e.g.rock size,structures and origin and so on.The gneiss series was formed by the tectonic gneisses of the Archean intrusive rocks through dynamic metamorphism and static recrystallization.The petrotectonics shows a diversity and a heterogeneity of the size structures,as well as a developed“blasto strain texture”.The rock texture and petrotectonics on space distribution exhibit a regular zonation.Aaccording to the unique texture of tectonic gneiss,a new term-“blasto strain texture”is proposed by the authers.Meanwhile,preliminary suggestion for the classification and nomenclature of tectonic gneiss is proposed.