Abstract
The Hasvik gabbro was intruded during the interval between two major deformation phases at theacme of the regional amphibolite fades metamorphism. During the F-2 folding, different strain patterns were produced dependent upon the predeformational rock fabrics. In the metasedimentary envelope, with markedly anisotropic fabrics, abundant minor fold structures were produced. In the gabbro and its immediately adjacent hornfelses, which have fabrics approximating to isotropic, conditions of brittle deformation obtained and the rocks yielded on a pattern of small wrench faults of varying order. As these structures formed during the regional metamorphism, the shear zones, associated with the faults, were subjected to annealing recrystallization and grain growth. Analogies are made with recent experimental work on rock deformation and recrystallization.
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