摘要
以宏观和显微构造特征为依据,论述了太华群自形成以来的构造演化过程,初步建立了太华群的构造演化序列,揭示了太华群内部的面理置换、褶皱叠加、断裂复合等规律,探讨了各变形幕的构造式样以及构造变形环境。在其构造层次的综合分析基础上,将太华群的构造演化历史,划分为4个主要构造变形阶段:Ⅰ.粘-塑性构造变形阶段;Ⅱ.塑性构造变形阶段;Ⅲ.脆-韧性构造变形阶段;Ⅳ.脆性构造变形阶段。
Ever since its forming,the process of structural evlution of Taihua Group has been dealt with in this paper on the basis of the characteristics of megascopic and micro-structure. The cuccession of structural evolution of the group has been established: and regularity of replacement of planar joint, fold superimposed, faulting recurrence within Taihua Group has been brought to light as well. Besides, the structural style of various defermation of Taihua episodes and environment of structural deformation has also been inquired into. The structural evolution history of Taihua Group can be divided into four major stages as follows: 1)Stick-plastic structural deformation; 2) Plastic structural deformation; 3)Brittle-tenacity structural deformation; 4)Brittle structural deformation.
出处
《西北地质科学》
1992年第2期75-82,共8页
Northwest Geoscience
关键词
太华群
断裂复合
多期构造
小秦岭
Taihua Group faulting recurrence multiple superimposedstructure deformational mechanism
