Abstract
All Late Permian deformation structures in the southern New England Fold Belt can be ascribed to a single but complex compressive tectonic event, the Hunter‐Bowen Orogeny, operative 265–250 Ma ago. Early Permian rifting of the Carboniferous arc and fore‐arc of the Tamworth Belt and the region directly west of it produced the Sydney Basin and subsidiary meridional troughs in a backarc environment. Initial east‐west compression in the Late Permian produced a series of meridional folds and subparallel faults (D1) above a westward‐propagating decollement. With continued east‐west compression, upward propagation of thrusts culminated in the southwest‐directed Hunter‐Mooki Thrust System (D2), associated with megascale sinistral shear that resulted from pinning and rotation of the Hunter Thrust about an axis located near Maitland. East‐west directed stress release on the upper allochthonous plate of the thrust resulted in the development of meridional backthrusts. The final major deformation (D4) reactivated the...
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