Brittle deformation of hornblende in a mylonite: a direct geometrical analogue of ductile deformation by translation gliding

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Abstract
Hornblende in a mylonitic rock from the Grenville front has deformed by fracture and slip on a parting subnormal to the c crystallographic axis. Rotation of the fragments during progressive deformation produced a preferred orientation of poles to the slip plane. When this slip plane had rotated close to the plane of the foliation, slip occurred on a second plane. This process is envisaged as being analogous to translation gliding in crystals.

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