Abstract
Abstract The Murchison Basin lies close to the Alpine Fault and has an evolution that is intimately related to the development of the New Zealand plate boundary during the Tertiary. Faults in the Murchison Basin follow a regional NNE structural grain which is inherited from Paleozoic sutures that were zones of weakness prior to the late Eocene inception of the basin. The Tainui Fault may be the southern extension of the Paleozoic Anatoki Thrust that was reactivated during late Cenozoic compression. The Matin and Maunga Faults, which mark the western margin to the basin and the junction with a structurally high Karamea Batholith, are late Eocene normal faults that have similarly been reactivated and overturned. The eastern boundary is formed by the Tutaki Fault, a southeast‐dipping thrust fault which delineates the Rotoroa Complex basement block. Folds within the basin reach a depth of 8 km, whereas, on the basin margins, they have formed as gentle drape folds over a warped basement surface. The dominant s...
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