Abstract
Abstract Five phases of deformation are recognised in the schists of the Mt Aspiring area, northwest Otago, New Zealand.The first two phases resulted in isocIinal ductile folding and macroscopic nappe formation during greenschist facies metamorphism. The third phase, which occurred during waning metamorphic conditions, resulted in tight folding, with east-west overthrusting of macroSCOPIC nappes.Ouring this third phase, earlyformed fold axes in high-strain zones were rotated towards the stretching or translation direction. The fourth deformation phase is characterised by chevron folds (on all scales) with north-trending axes and associated west-dipping thrust faults.The Moonlight Fault, a major regional feature.is associated with this phase of deformation. The fifth phase of deformation involved mesoscopic conjugate sets of crenulations with east- and southeasttrending axes. Steeply dipping, fold axial surface joints developed in these crenulations are commonly intruded by lamprophyric dikes or associated...
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