Abstract
The Strangways Orogenic Belt of 1800 Ma granulites in the central Arunta Block was completely reworked at granulite-facies grades during the Middle Proterozoic (1400–1500 Ma). The bulk strain regime of the initial episodes of this reworking is presented. Ductile reworking involved non-coaxial deformation on a regional scale and produced map-scale sheath folds. High bulk shear strains are inferred on microscopic and macroscopic scales and the spatial variation in bulk shear strain throughout the region is discussed. The high bulk shear strains were accommodated by east-over-west ductile ramping and fold repetition, resulting in easterly inclined structures, crustal shortening and crustal over-thickening.
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