Abstract
Abstract Torlesse rocks in the northern Ben Ohau Range form steeply plunging north-facing structures with steep axial planes trending mostly NNE and NE. In a central belt of the range textural zone 2 (and some zone 3) schists have been developed, probably after the folding, by a mechanism including flattening across the schistosity plane. Fold axes have variable attitudes and plunge north in the non-schistose rocks. In the schists the axes are more strongly aligned and plunge south to give overturned structures and well developed lineations. Decollements with dextral vergence com plicate the pattern of the main structure, the Bush Stream anticline, which is exposed along the crest of the range; they also affect the Whale Stream syncline to the east. Local south-facing folds in the non-schistose rocks of the eastern foothills may indicate earlier stages of structural development. Movement along the Great Groove Fault on the eastern edge of the schist has been complex, possibly changing from a system with a...
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