The structural and metamorphic history of the Lower Palaeozoic rocks of central Murrisk, County Mayo, Eire

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Abstract
The Ordovician and Silurian rocks of central Murrisk possess a common post-Wenlock, pre-Viséan metamorphic and tectonic sequence, during the development of which a complex history of recrystallization and deformation was associated with the growth of a relatively simple major structure. Five phases of deformation, excluding faulting, affected the region. An early phase of buckling, flattening and variable stretching with the development of slides and great fold-plunge variation was succeeded by a phase of essentially plane strain during which a complex plunge and facing geometry was developed. The third deformation consisted of the growth of generative folds with vertical east–west axial surfaces and was succeeded by the development of strain-slip and crenulation cleavages. The fifth phase of deformation was an east–west axial shortening with the development of steeply plunging kink-bands.

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