关键词: 三维变形, 有限应变, 构造面理, 矿物拉伸线理, 运动学涡度

Abstract: A new model, assuming "material extrusion along the simple-shearing direction during deformation", based on three-dimensional deformation theory and transpression model, investigates the relationships between "material extrusion along shear direction" and emerging combinations of foliation-lineation orientations, switches of foliation or lineation orientations and three-dimensional kinematic vorticity in terms of finite strains. The analysis shows that the material extrusion along shear direction will work on structural fabric patterns in tectonites. In thinning deformation, if material extrusion along vertical direction (z) is less than that along shear direction (x) (a≤1), the vertical foliation-horizontal lineation develops for the lengthening / thinning shear deformation, and the combining-patterns of foliation-lineation are independent of kinematic vorticity number (ω_k). However, in case of a>1, i.e. widening / thinning shear deformation, structural fabric patterns of shear zone are determined by two factors, namely, kinematic vorticity number (ω_k) and shortening (k) parallel to y-axis. The implications of this study are differential orientations of stretching lineations might be formed in the same transport direction of a shear zone, particularly in high-strain zones, the orientation of stretching lineations is not necessarily shear-parallel to the simple-shear component during the three-dimensional deformation.

Key words: three-dimensional deformation, finite strain, foliation, mineral stretching lineation, kinematic vorticity