Early Miocene thin‐skinned tectonics and wrench faulting in the Pongaroa district, Hikurangi margin, North Island, New Zealand

Delteil, Jean; Morgans, Hugh E. G.; Raine, J. I.; Fielding, C. R.; Cutten, H.

doi:10.1080/00288306.1996.9514711

Cited by 37 publications

(44 citation statements)

References 23 publications

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“…The Owahanga olistostrome and associated nappes exclusively occur at the very oceanward part of the Coastal Ranges, within and dissected by the easternmost ATF and AFZ systems of faults. This location results from rightlateral cumulative displacements that postdate olistostrome and nappe emplacement on the inland strike-slip ATF and AFZ systems of faults (Spörli's proposition in Ballance & Spörli 1979;Delteil et al 1996).…”

Section: Discussion Of the Geodynamic Settings Of The Olistostromesmentioning

confidence: 99%

“…The uppermost beds of this formation grade up into coarse sediments and near the top are interlayered with exotic lenses of mudstone and siltstone (respectively of early Oligocene and latest Cretaceous ages) that increase in size up-section. This sequence, including the exotic lenses observed east of the Owahanga settlement, was described as the Owahanga Melange by Delteil et al (1996). A similar sequence, though thinner and lacking large exotic lenses, is exposed much farther south on the coast in the Flat Point area (Chanier 1991).…”

Section: How Many Olistostromes?mentioning

confidence: 99%

“…In contrast, to the south at two localities in the central Coastal Ranges, Delteil et al (1996) described Cenozoic dismembered rocks near major subvertical N030-oriented strike-slip faults which parallel the Coastal Ranges and the general trend of the present margin. The first locality is west of a 20 km long segment of the Adams-Tinui Fault (ATF of Fig.…”

Section: Nature Of the Dismembered Rocksmentioning

confidence: 99%

“…These beds were deformed before consolidation. They are followed at Owahanga by several 0.5-1 m thick debris flows containing pebbles and clasts with ages ranging from Late Cretaceous up to Oligocene (Moore 1988b;Delteil et al 1996). The debris flows are intercalated between packets of regularly alternating beds of mudstone and fine-grained sandy limestone (Fig.…”

Section: The Owahanga Olistostromementioning

confidence: 99%

“…These three The location of the Coastal Ranges near the leading edge of the overriding Australian plate logically led to considering it as a progressively westward tilted and eventually emerged part of the Hikurangi accretionary prism (Pettinga 1982;Chanier 1991;Lewis & Pettinga 1993;Beanland 1995). Other work carried out in the Coastal Ranges (Kingma 1962(Kingma ,1967Ridd 1967;Moore 1988a;Delteil et al 1996;Neef 1999) as well as offshore (Collot et al 1996;Barnes et al 1998) identified predominantly strike-slip deformation within the Coastal Ranges and on the Hikurangi margin continental shelf. Some of these major strike-slip faults controlled sedimentation since early Miocene times in the Coastal Ranges, which therefore cannot be simply considered an older and more deformed part of a thrust-faulted accretionary wedge.…”

Section: Introductionmentioning

confidence: 99%

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Olistostromes marking tectonic events, East Coast, New Zealand

Delteil

Lépinay

Morgans

et al. 2006

New Zealand Journal of Geology and Geophysics

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Three discrete, successive tectonic events are marked by olistostromes in the East Coast, North Island. An Eocene Mataikona event is characterised by in situ dismembered beds. A second, Owahanga event is Otaian and preceded wrench faulting coeval with the start of oblique subduction at the East Coast margin. This second event is characterised by extended emplacement of exotic material followed by gliding, gravity-driven nappes that are probably related to obduction along the north coast of the North Island. The third olistostrome is attributed to an early Miocene Mara event synchronous with incipient strike-slip faulting during Altonian times and the commencement of oblique convergence at the Hikurangi margin. From the ages and paleoenvironments of the olistostromes, we propose the Eocene and earliest Miocene syn-sedimentary structures were dragged along the deforming backstop of the Hikurangi prism.

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Section: Discussion Of the Geodynamic Settings Of The Olistostromesmentioning

confidence: 99%

Section: How Many Olistostromes?mentioning

confidence: 99%

Section: Nature Of the Dismembered Rocksmentioning

confidence: 99%

Section: The Owahanga Olistostromementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Olistostromes marking tectonic events, East Coast, New Zealand

Delteil

Lépinay

Morgans

et al. 2006

New Zealand Journal of Geology and Geophysics

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Thermal history and exhumation of basement rocks from Mesozoic to Cenozoic subduction cycles, central North Island, New Zealand

et al. 2014

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A new thermochronological study of the basement rocks of the central North Island, New Zealand, records thermal and exhumation histories related to two subduction cycles since the latest Jurassic. The basement comprises metasedimentary terranes accreted onto eastern Gondwana during Mesozoic subduction. Since the Oligocene, these terranes have been located on the hanging wall of the Hikurangi subduction margin, overriding the Pacific Plate. Results of zircon fission track (121-264 Ma) analysis yield detrital or slightly reset ages; apatite fission track (19.8-122 Ma) and (U-Th-Sm)/He (10.3-95.2 Ma) ages are fully reset. Results from inverse thermal history modeling of the data of individual and stacked samples imply the following: (1) after their accretion, the basement rocks were cooled and exhumed to shallow depths of the crust in the Early Cretaceous (by~150-135 Ma). This was followed by an episode of reheating until~100 Ma, which we interpret to be the result of burial by sedimentation above the accretionary wedge during extensional deformation caused by continued underplating and thickening of the wedge from beneath. (2) From 100 Ma, our data indicate thermotectonic quiescence until the Oligocene (~27 Ma). (3) During initiation of the Hikurangi Margin, the fore-arc proto-Axial Ranges began to exhume during the late Oligocene to early Miocene (~27-20 Ma). Subduction-triggered unroofing removed~1.2-2.8 km of overburden, most of which was probably the less lithified passive margin sediments. (4) Along the western central North Island, the exhumational response to the Hikurangi subduction was limited, with a total magnitude of erosion <1.5 km in the Cenozoic.

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