张八岭变质地体变质构造岩的显微构造与结构特征

本文在1／5万张八岭幅、珠龙幅区域地质调查基础上．运用微观构造与宏观构造相结合的方法，借助于现代测试技术．对张八岭变质地体山变质构造岩的显微构造与结构进行了研究。验证和深化了野外工作所观察到的现象和认识；探讨了应力和应变之间的关系；计算了差异流动古应力值；恢复了构造变动对岩石的应力状态和方位。

MICROSTRUCTURAL AND FABRIC FEATURES OF METAMORPHIC-TECTONITE, ZHANGBALING METANORPHIC TERRANE

Zhangbaling metamorphic terrane is located in the east of Qinling-Dabie orogenic zonewhich developed between North China Block and Yangtze Block. The terrane had undergonestrong tectonism and regional metamorphism. Destroying of structural trace in original rockwas accompanied with forming of a series of new structural elements, such as penetrative plannar and linear structures as well as complex solid flow fold.Based on field survey, authors paid great attention to the study on microstructural andfabric which remained in metamorphic tectonite and deformed quartz by modern equipments,such as H.V E, M. and A. S. M., in order to obtain the deformation environment andmechanism of metamorphic tectontes. discussing the relationship between stress and strain.Main cunclutions are as fullows:1. Macroscopie-mcroseopic-and ultramicroscopie structural features of metamorphic tectonite uf Zhangbaling metamorphie terrane are of unity, i. e. forming mechanism is of unity.Plastic defvrlnation and Solid flow structural features can be observed not only in microscopicbut also in ultramieroseopic.2. The defurmation of metamorphic tectonites is caused mainly by plastic deformation andsolid flow which included plastic flow, slipping between minerals, recrystallzation and formingof new facies minerals.3. Authors obtain differential flow palaeustress values of forming of metamorphic tectonites with observing and studying to H. V. E. M. diffractometer pictures of deformationquartz and divide deformation stage into two substages.4. The fabric pattern uf anisotropy of magnetic susceptibility (A. M. S ) of tectonites is areflection of the rocks strain Condition The shape uf susceptibility ellipsoid takes oblate as thekey, which shows that the metamorphic tectonites had suffered strongly compressing andshearing.