THE DUCTILE SHEARING DEFORMATION OF MEDIUM-SHALLOW STRUCTURAL FACIES AND KINEMATICAL IMPLICATION IN CHAGANTONGGE AREA, INNER MONGOLIA

The ductile shearing deformation of medium-shallow structural facies in Chagantongge area, Inner Mongolia is developed in the sericite-quartz schist and quartzite of Liushugou rock formation, limestone of the third member of Halahuogete formation and basic dyke in Zuzunmaodao. The characteristics of mineral deformation vary obviously in different structure positions and rocks. Overturned isoclinal folds with mineral stretching lineation occur in limestone. Rodding structure and sheath fold are developed in sericite-quartz schist. The mineral stretching lineation and rodding structure, extending paralleled to the direction of shearing deformation, belong to a-type of lineation. Horizontally, the deformation is strong in the center of the shear deformation zone, while weak outwards. Macroscopic and microscopic characteristics, such as S-C fabrics and "mica fish", indicate a NEE-trending inclined shearing movement, with low greenschist facies of metamorphism.