共轭伸展褶劈理夹角的定量解析

通过静力和动力学解析，共轭伸展褶劈理面对最大主应力方向的理想夹角为１０９°２８′，与实际观测值一致。共轭伸展褶劈理的取向取决于形成时剪切作用类型，纯剪切时以糜棱面理为对称面，但在一般剪切时则与之不对称。同向褶劈理与糜棱面理间的夹角变化于－ ９°４４′～３５°１６′之间，取决于简单剪切与纯剪切的相对组分。共轭两组常不同等发育。Ｐ方向的同向剪切趋势抑制反向褶劈理的形成。同向伸展褶劈理的扩展是导致低角正断层形成的有效机制

A quantitative analysis of the angle between conjugate extensional crenulation cleavages

Through the analysis of statics by combining with dynamics, the initial angle between conjugate extensional crenulation cleavages (eccs) gained by the author is 109° 28′, which comes well up to the field data. The orientation of the conjugate eccs depends on the contemporary shear type. In the pure shear case, conjugate eccs are symmetric about the mylonitic foliation, but in the general shear case they are asymmetric about it. The angle between the synthetic ecc and the mylonitic foliation ranges from -9°44′to 35°16′, depending on the simple shear component relative to the pure shear one. The synthetic eccs usually develop better than the antithetic ones. The trend of the P shear with opposite shear sense may constrain the development of the antithetic eccs. The propagation of synthetic eccs is probably an effective mechanism for the development of the low angle normal faults.