Murihiku Supergroup (Triassic—Jurassic) of Southland and South Otago

Campbell, John; Coombs, D. S.

doi:10.1080/00288306.1966.10422483

Cited by 63 publications

(53 citation statements)

References 4 publications

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“…The dominant lithologies exposed on the eastern side of Island Bay, Wellington, are interbedded sandstone (greywacke) and mudstone (indurated to argillite) of the Torlesse Supergroup (Campbell & Coombs 1966), more commonly referred to as the 'Wellington Greywacke' (Reed 1957) (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

The origin of metavolcanic and associated argillaceous rocks at Island Bay, Wellington, New Zealand

George¹

1985

New Zealand Journal of Geology and Geophysics

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The alternating greywacke-argillite turbidite beds exposed on the eastern side of Island Bay, Wellington, New Zealand, belong to the Torlessia fossil zone of the Torlesse Supergroup. They were deposited in a deep-water marine environment. Subsequent reworking by bottom currents has in places formed contourites.The volcanic sequence, comprising altered and sheared doleritic and variolitic metabasite and associated red and yellow argillite, is concordant with the surrounding sedimentary rocks. Major element content and elemental ratios suggest that the metabasites are tholeiitic basalts. Discriminant diagrams using immobile elements show that the data are consistent with either ocean floor or withinplate settings.Field relationships and geochemistry of the volcanic sequence, and modem seamount analogues, suggest that an inactive talus-flanked seamount was carried by sea-floor spreading towards the subduction zone and became progressively tilted as it approached the trench axis, thus enabling the lava flow debris together with pelagic clays to slide into the zone of turbidite deposition.Any soft-sediment deformation which resulted from the sliding event was largely overprinted by tectonic deformation which occurred when the trench deposit was incorporated into the accretionary prism. Contemporaneous metamorphism raised the rocks to prehnite-pumpellyite grade.

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Section: Introductionmentioning

confidence: 99%

The origin of metavolcanic and associated argillaceous rocks at Island Bay, Wellington, New Zealand

George¹

1985

New Zealand Journal of Geology and Geophysics

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“…These rocks, generally referred to as Torlesse Supergroup, facies, or zone (in a textural sense; Carter et al 1974), contrast with the well-bedded, structurally simple, relatively fossiliferous and predominantly volcanoclastic sediments of the Hokonui facies, the other major facies of the New Zealand Geosyncline (Carter et al 1974). Stevens ( 1963) extended the application of the name Torlesse (Suggate 1961;Campbell and Coombs 1966) from the South to the North Island, where Grindley (1960) had previously recognized several "greywacke" units within the Torlesse in western Raukumara Peninsula (Speden 1972). Kear (1971) classified the Torlesse of the northern part of the North Island into two distinct facies (Morrinsville and Hunua) and compared these with his Oparau (= Hokonui) facies.…”

Section: Introductionmentioning

confidence: 99%

Fossil localities in Torlesse rocks of the North Island, New Zealand

Speden

1976

Journal of the Royal Society of New Zealand

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Data on 110 fossil localities in Torlesse rocks of the North Island of New Zealand are tabulated, and the distribution of localities shown on maps. Zones are fewer and less well defined than in the South Island. The Permian is particularly fossiliferous, but no Kaihikuan (Ladinian) fossils are known. Much of the Torlesse might be Late Jurassic except for anticlinal cores, possibly in part faulted, of Permian, Late Triassic, and Early Jurassic.Although tectonic mobility is demonstrated by the occurrence of derived fossils, the distribution of fossil localities, is, by itself, of limited value in paleoenvironmental, paleogeographic, and provenance interpretations.

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“…We report here Lower Jurassic radiolarian fossils newly obtained from Aratauran strata of the Murihiku Supergroup (Campbell & Coombs 1966) in the South Island, and discuss briefly their stratigraphic significance.…”

Section: Introductionmentioning

confidence: 95%