Fig. 4

Field photograph of the Himalayan tectonic structures observed in the Miyar Valley. A Mylonitic sandstone with σ-type porphyroclasts of quartz showing a top-to-the NE shear sense in the footwall of the Miyar Shear Zone. B Top-to-the SW σ-type porphyroclasts in the footwall of the Miyar Shear Zone illustrating that the Miyar Shear Zone initially acted as a thrust zone before to be reactivated as an extensional shear zone. C S1 and S2 interference pattern in the greenschist facies rocks of the downstream part of the Miyar Valley (hanging wall of the Miyar Shear Zone) (modified after Steck et al., 1999). D F1–F2 fold and S1–S2 interference pattern in the hanging wall of the Miyar Shear Zone (modified after Steck et al., 1999). E Discrete S3 crenulation cleavage and associated F3 fold overprinting the main S1 + S2 foliations