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• W1991884817 abstract "After a prolonged period of convergent margin tectonics in the Late Paleozoic and Mesozoic, resulting in terrane accretion, uplift and erosion of the New Zealand segment of Gondwana, the region saw a rapid change to extensional tectonics in mid-Cretaceous times. The change in regime is commonly marked by a major angular unconformity that separates the older, often strongly-deformed subduction-related ‘basement’ rocks from the younger, less-deformed ‘cover’ strata. The youngest ‘basement’ strata locally contain Albian fossils, and the youngest associated zircons have been radiometrically dated at ca. 100 Ma. In general the oldest strata overlying the unconformity contain fossils of similar Albian age, and the oldest radiometric dates also give similar dates of ca. 100 Ma, indicating a very rapid transition between the two tectonic regimes. The onset of extension resulted in the widespread development of grabens and half grabens, associated in the northwest of the South Island with a metamorphic core complex. In the west and south, on the thicker and more buoyant crust of most of the South Island, the new basins were infilled with mainly non-marine deposits. Non-marine graben infill consists of locally-derived breccia deposited as talus or debris flows on alluvial fans, passing directly as fan deltas or via fluvial deposits into lacustrine deposits. Active faulting continued in some areas until the initiation of sea floor spreading in Santonian times. Post-subduction strata on the thinner continental crust of the northeastern South Island and eastern North Island (East Coast Basin) were mainly marine. Initial sedimentary deposits in the west of the basin, reflecting extensional tectonism, consist of coarse-grained debris-flow deposits or olistostromes, generally fining upwards as tectonic activity waned: those in the east, including allochthonous sediments derived from the northeast, are dominated by turbidites. Early Cenomanian (ca. 96–98 Ma) injection of intraplate alkaline igneous rocks in central New Zealand caused updoming, resulting in shallowing and local uplift of the basin floor above sea level. A long (ca. 10 Ma) period of slow subsidence and transgressive marine sedimentation interrupted by episodic relative sea level changes followed. This pattern changed in the Late Coniacian (ca. 87–86 Ma), with a sudden influx of coarse, transgressive sands in eastern New Zealand. This was immediately preceded in parts of the region by uplift and erosion, probably driven by convective upwelling of the mantle just prior to sea-floor spreading, resulting in a ‘break-up’ unconformity. In the Late Santonian (ca. 85–84 Ma), development of a new, diachronous, widespread low-relief erosion surface, overlain by fine-grained deposits accompanying a rapid rise in relative sea level, coincided with the beginning of sea-floor spreading, rapid passive margin subsidence, and final separation of New Zealand from Gondwana." @default.
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• W1991884817 date "2004-01-01" @default.
• W1991884817 modified "2023-10-14" @default.
• W1991884817 title "The Break-up of a Long-term Relationship: the Cretaceous Separation of New Zealand from Gondwana" @default.
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• W1991884817 doi "https://doi.org/10.1016/s1342-937x(05)70325-7" @default.
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