走滑构造变形量估算方法探讨

METHOD OF DEFORMATION ESTIMIATION OF THE STRIKE-SLIP STRUCTURES:A DISCUSSION

走滑构造属基底卷入型构造，由基底走滑断层控制沉积盖层的变形，且走滑断层的位移量与盖层的变形量间有定量关系。岩石在地壳浅部的永久变形以破裂变形为主，其变形量在一定层位可测量，可据此求得基底走滑断层的位移量，即走滑构造的走滑量，并进一步求得沉积盖层中各层位平移断层的位移量。

The displacement of basement wrench fault causes the deformation of sedimentary covers. The deformation of the sedimentary covers have certain quantitive relations with the amount of the shear displacement of the basement wrench fault. The total deformation of the sedimentary covers include compressive, extensional and wrench deformation equals to the shear displacement of the basement wrench fault. From the surface of the basement, the shear deformation becomes smaller upward till zero. Thus, the shear displacement of the basement wrench fault can be determined based on the transformation of the shear deformation into compressive and extensional deformation. Then the displacement of each sedimentary layer from basement can be estimated up to the depth where the shear deformation equals zero.