变质岩区褶皱构造恢复的方法与实践——以新疆北山高尖地区为例

Method and Practice of Recovering Folds in Metamorphic Rocks Area——As example by the Gaojian area,Beishan, Xinjiang

强烈变形变质地区 ,构造置换往往导致层理或褶皱变形面消失 ,从而造成大褶皱形态确定的困难性。采用微片石法、无根褶皱法、构造透镜体法、脉体褶皱法等新方法恢复大褶皱 ,可以取得良好效果。新疆北山高尖地区石炭系石板山组由于强烈变形变质 ,区域褶皱不显 ,为常规方法难以识别的隐性褶皱 ,曾认为是单斜地层。在区调填图基础上 ,综合运用上述方法 ,相互印证 ,成功恢复了该区一系列近东西向。

In the district of strong deformation and metamorphic,strong deformation and metamorphism causes bedding and formation face disappearance. Thus the definition of big folds shape is suitable difficult. The authors applie a series of new method,such as the methods of micro sheet stone, methods of hook-shaped folds, methods of structural lenticular body and folds of dike rocks and so on, the recovering of folds gets good effect. Because of strong deformation and structural transposition of Carboniferous Shibanshan Formation in the Gaojian,Beishan area, Xingjiang,regional folds are destroyed completely.They are the fairly hidden folds that are difficutly distinguished by convention methods and thought once monocline stratum.On the foundation geologic mapping,the paper apply above methods synthetically and confirm mutually,and a series of folds ,which are closed and isoclinal, the near EW direction, several ten kilometers long have successfully been recovered in the area.