We investigate kinematic evolutionary paths of seventeen major shear zones associated with internal thrust faults from the Himalayan, Appalachian, Caledonian, Zagros, Alpine, and Sevier fold-thrust belt (FTB), by assessing published minimum strain, kinematic vorticity number, and minimum translation. We estimate the pure shear component from the recorded vorticity and reconstruct a first-order kinematic path based on multiple strain markers, wherever possible. The studied shear zones follow decelerating strain paths. In general, sub- simple shear more effectively accumulates translation than pure/simple shear deformation. Shear zones with relatively high pure shear component record higher strain. Incremental strain markers from these shear zones record a progressive evolution from an earlier simple shear dominated to a pure shear dominated flow. These results are in agreement with earlier theoretical studies.

Internal shear zones that act as roof thrusts of duplexes or have stacked imbricate structures in their immediate footwall, generally record relatively higher strain, greater translation and greater pure shear component toward the later stage than similar shear zones without such footwall structures. We interpret that slip-transfer and structural culmination formed during growth of immediate footwall structures contribute to the kinematic evolution of internal shear zones. The same shear zone records along-strike variation in its kinematic path as a result of its varying immediate footwall geometry. Thus, deciphering comprehensive kinematic evolutionary paths of internal shear zones also requires understanding of immediate footwall structures. Additionally, studying kinematic paths of internal shear zones may provide insights into the geometry of immediate footwall structures when they are not exposed.

我们通过评估公布的最小应变、运动涡度数和最小平移，研究了与喜马拉雅、阿巴拉契亚、加里东、扎格罗斯、阿尔卑斯和塞维尔褶皱逆冲带 (FTB) 的内部逆冲断层相关的 17 个主要剪切带的运动演化路径. 我们从记录的涡量中估计纯剪切分量，并尽可能基于多个应变标记重建一阶运动路径。研究的剪切区遵循减速应变路径。一般来说，亚简单剪切比纯/简单剪切变形更有效地累积平移。具有相对较高纯剪切分量的剪切区记录较高的应变。来自这些剪切带的增量应变标记记录了从早期简单剪切主导到纯剪切主导流动的渐进演变。

作为复式屋顶推力或在其直接下盘具有叠瓦状结构的内部剪切带，通常比没有这种下盘结构的类似剪切带记录相对更高的应变、更大的平移和更大的向后期的纯剪切分量。我们解释说，在直接下盘结构生长过程中形成的滑移传递和结构顶点有助于内部剪切带的运动演化。由于其不同的直接下盘几何形状，同一剪切带记录其运动路径的沿走向变化。因此，破译内部剪切带的综合运动演化路径也需要了解直接的下盘结构。此外，