最近在几个地区进行的野外工作表明,推覆体和逆掩盘内的变形经常包括垂向缩短和平行层面的剪切。可以将层内的变形看作(1)平行冲断层面、拉伸分量为α的纯剪和(2)与冲断层面平行的剪切面简单剪切(γ)的合成。所以,简单剪切部分的滑动方向和纯剪部 Recent field work in several areas has shown that the deformations in the nappe and in the detritus often include vertical shortening and shear at parallel levels. The in-layer deformation can be viewed as (1) parallel thrust plane, pure shear with α as a tensile component, and (2) simple shear (γ) shear plane parallel to the thrust plane. So, simply cut the part of the sliding direction and pure shear