苏尼特左旗地区海西末—印支期构造活动特征

THE CHARACTERISTIC FEATURES OF LATE HERCYNIAN INDOSINIAN TECTONIC ACTIVITIES OF THE LEFT SONID BANNER AREA,INNER MONGOL AUTONOMOUS REGION

该文对内蒙古苏尼特左旗地区 NNE向褶皱的形态、褶皱成生时承受的轴向载荷、压缩量乃至断裂及韧性剪切带的形态和变形域进行了对比研究 ,划分了变形序次。在此基础上认为该区存在印支运动的构造形迹 ,且该形迹是在海西末期形成的构造形迹的基础上 。

The region of Left Sonid Banner of Inner Mongolia is located in the Xing Meng fold zone of the northern rim of the North China Plate.A comparative study of the shapes of the ENE trending folds,the causative axial loading and the resulting shortening as well as the geometry of the faults and ductile shear zone has been made.And the strain sequence is thereby established.As a result there has been distinguished Indosinian tectonic features produced on the foundation of the late Hercynian strucures by progressive deformation under the same ensueing stress field.