Abstract
A simple shear model is proposed for mobile belts characterised by L-S tectonite fabrics in which the planar element dips at a low angle away from the foreland and the linear (stretching) element is transverse to the boundary of the belt. Reorientation of fold axes towards parallelism with the stretching direction appears to be a common feature consistent with this model. The geometry described is consistent with crustal shortening normal to the strike of the active belt, notwithstanding the transverse orientation of stretched elements.
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