We present results of scaled analogue modelling, which show the influence of varying single-layer inclination on the geometry of folds produced by high coaxial plane strain (e_Z = −70%). The initial angle (θ_X(i)) between the competent layer and the stretching axis (X) was incrementally changed by rotating the layer around the shortening axis (Z). The analogue material consists of non-linear viscous plasticine, which simulates deformation by dislocation creep. The experiments were carried out at various viscosity ratios between layer and matrix, and one run focused on incremental strain.

Deformation-induced rotation of the oblique single layers was similar fast to that of a corresponding passive plane. With increasing initial layer inclination (θ_X(i)) the axes of developing folds rotate from the X-to the Y-direction resulting in extension-parallel, non-cylindrical (periclinal) and parasitic folds; the layer-parallel elongation decreased to zero at θ_X(i) = ca. 60°, and shortening along the Z-axis was progressively accommodated by buckling. The amplitude of folds increased with the degree of layer inclination. Non-cylindrical folding of single oblique layers under bulk coaxial plane strain is described for the first time. In contrast to extension-parallel folds, their shape is significantly affected by the viscosity ratio between layer and matrix.

我们提供了比例模拟模型的结果，该结果显示了变化的单层倾斜度对高同轴平面应变（e _Z  = -70％）产生的褶皱几何形状的影响。通过使该层绕着缩短轴（Z）旋转，使感受层与拉伸轴（X）之间的初始角度（θX _（i））逐渐变化。模拟材料由非线性粘性橡皮泥组成，可通过位错蠕变模拟变形。实验是在层与基体之间的各种粘度比下进行的，其中一项实验着重于增加应变。

变形引起的倾斜单层旋转与相应的被动平面的旋转相似。随着初始层倾斜度（θX _（i））的增加，显影褶皱的轴从X-旋转到Y-方向，从而导致平行，非圆柱形（周向）和寄生褶皱延伸；当θX _（i）  = ca时，平行层延伸率减小到零。60°，并沿Z缩短轴通过屈曲逐渐适应。褶皱的幅度随着层的倾斜程度而增加。首次描述了在整体同轴平面应变下单斜层的非圆柱形折叠。与平行延伸的褶皱相反，它们的形状受到层与基质之间的粘度比的显着影响。