Abstract
Abstract Several of the present mountain ranges of the West Coast of New Zealand were the site of basin sedimentation during the Tertiary. The Paparoa Range, South Island, New Zealand, is one such example. It is composed of Early Cretaceous and older granitoid and gneissic suites which were first unroofed in the Cretaceous during a period of extension associated with the fragmentation of the Pacific margin of Gondwana. Burial in the late Eocene ‐ Oligocene occurred as Tertiary sediments accumulated on this basement. A second period of uplift removed the sedimentary cover and exposed the basement rocks once again to the surface. Fission‐track dating of zircons and apatites from these basement rocks yields ages which constrain these periods of movement. Zircon ages are Cretaceous and indicate that most of the basin was not buried to depths greater than 8 km. The apatite ages show irregular but progressive younging from east to west, which is interpreted as an increase in amount of resetting. The eastern edg...
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