Detrital zircon ages in Buller and Takaka terranes, New Zealand: constraints on early Zealandia history

Adams, C. J.; Mortimer, Nick; Campbell, H. J.; Griffin, William L.

doi:10.1080/00288306.2015.1025798

Cited by 34 publications

(12 citation statements)

References 69 publications

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“…Possible Takaka Terrane (or older) equivalents have been reported from greywacke and schist on Campbell Island (Adams, ). A Precambrian K/Ar age for a granite dredged from the southernmost tip of Campbell Plateau (site S100) was reported by Challis et al () and its age confirmed in a U‐Pb study by Adams et al (). However, the low‐temperature thermochronological study by Mortimer et al () interpreted the sample as an Antarctic‐derived dropstone and, thus, not part of an in situ Campbell Plateau pluton.…”

Section: Introductionmentioning

confidence: 55%

Reconnaissance Basement Geology and Tectonics of South Zealandia

et al. 2019

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We report new U-Pb zircon ages, geochemical and isotopic data for Mesozoic igneous rocks, and new seismic interpretations of mostly submerged South Zealandia (1.5 Mkm 2 ). We use these data, along with existing geological and geophysical data sets, to refine the extent and nature of geological units. Our new 1:25 M geological map of South Zealandia provides a regional framework to investigate the rifting and breakup that formed Zealandia, Earth's most submerged continent. Samples of prerift (pre-100 Ma) plutonic rocks can be matched with on-land New Zealand igneous suites and indicate an east-west strike for the subduction-related 260 to 105-Ma Median Batholith across the Campbell Plateau. The plutonic chronology of formerly contiguous plutonic rocks in West Antarctica reveals similar pulses and lulls to the Median Batholith. Contrary to previous interpretations, the Median Batholith does not coincide with the 1,600-km-long Campbell Magnetic Anomaly System. Instead we interpret the continental magnetic anomalies to represent a mainly mafic igneous unit, whose shape and extent is controlled by synrift structures related to Gondwana breakup. Correlatives of some of these unsampled igneous rocks may be exposed as circa 85 Ma alkalic volcanic rocks on the Chatham Islands. Extension directions varied by up to 65°from 100 to 80 Ma, and we suggest this allowed this large area to thin considerably before final rupture to form new oceanic crust. Synrift (90-80 Ma) structures cut the oroclinal bend in southern South Island and support a pre-early Late Cretaceous age of orocline formation.

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Section: Introductionmentioning

confidence: 55%

Reconnaissance Basement Geology and Tectonics of South Zealandia

et al. 2019

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“…Unlike the Taranaki Basin datasets, there are few or no Devonian–Carboniferous zircons; instead there are substantial late Mesoproterozoic – Ordovician zircon populations, especially at the northern localities (10–16, 19) . The Precambrian – early Palaeozoic zircon groups are characteristic of the Buller and Takaka terranes of the Western Province (Adams et al 2015), but the Early Cretaceous and Devonian–Carboniferous zircons suggest Median, Paparoa and/or Hohonu Batholith plutonic sources. At three localities (17, 24a, 25 ) late Early Cretaceous zircons very much dominate (often >60%), presumably reflecting prominent local granitoid sources, and the Palaeozoic–Precambrian zircon proportions are accordingly much reduced.…”

Section: Resultsmentioning

confidence: 99%

“…These three zircon age groups are readily matched with the age patterns from the Palaeozoic basement of the Western Province in Zealandia (Adams et al . 2015), or potentially from similar rocks present in formerly adjacent parts of Gondwana, that is, SE Australia and Antarctica. The nature of the mid-Cretaceous Gondwana break-up that formed Zealandia, and distinctive features of Zealandia's Palaeozoic basement, suggest that zircon recycling was solely from the Zealandia basement as discussed in more detail in the following section.…”

Section: Resultsmentioning

confidence: 99%

“…However, the early Palaeozoic sandstones in the New Zealand Western Province often have detrital zircon components in the range 600–700 Ma, absent from their Australian and East Antarctic counterparts, which suggests that their original sources are probably within (present-day) Zealandia (Adams et al . 2015). It is notable that such 600–700 Ma components, recycled from local basement, are seen in the Late Cretaceous, mainly fluvial, cover successions at western and southern localities (10, 11, 14, 16) .…”

Section: Discussionmentioning

confidence: 99%

“…Procedures for zircon mineral separation, mounting and polishing and inductively coupled plasma mass spectrometry (ICP-MS) U–Pb age determinations and their presentation are identical to those outlined in Jackson et al (2004) and Adams et al (2013 a , b , 2015). The ages reported here are from the outer parts of zircon grains, close to crystal faces and/or crystal terminations, avoiding older cores wherever possible.…”

Section: Methodsmentioning

confidence: 99%

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Perspectives on Cretaceous Gondwana break-up from detrital zircon provenance of southern Zealandia sandstones

et al. 2016

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-Detrital zircon U-Pb ages in 37 sandstones from late Early -Late Cretaceous marine and non-marine successions across southern Zealandia indicate a provenance from local basement within present-day Zealandia. Samples from Taranaki Basin were derived from Median and Karamea batholith granitoids with transport directions from west to east. Samples from West Coast, Western Southland and Great South basins contain components derived more locally and more variably from Median Batholith and Rahu Suite granitoids and/or the Palaeozoic Buller Terrane. West Coast Basin samples have more plutonic contributions and Great South Basin localities have more Albian-aged (c. 110-100 Ma) zircons. Samples from Canterbury Basin were sourced from Torlesse Composite Terrane basement. The provenance variations are present in both marine and non-marine sandstones and suggest localized watersheds. This fits an interpretation of Late Cretaceous deposition in riftcontrolled basins across southern Zealandia during pre-Gondwana break-up regional extension. More speculatively, some additional source areas may have been created at the rifted margins of Zealandia during this break-up.

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Evolution of the East Gondwana convergent margin in Antarctica, southern Australia and New Zealand from the Neoproterozoic to latest Devonian

Glen

Cooper

2021

Earth-Science Reviews

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Detrital zircon ages in Buller and Takaka terranes, New Zealand: constraints on early Zealandia history

Cited by 34 publications

References 69 publications

Reconnaissance Basement Geology and Tectonics of South Zealandia

Reconnaissance Basement Geology and Tectonics of South Zealandia

Perspectives on Cretaceous Gondwana break-up from detrital zircon provenance of southern Zealandia sandstones

Evolution of the East Gondwana convergent margin in Antarctica, southern Australia and New Zealand from the Neoproterozoic to latest Devonian

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