Evidence for marine deposition in the Late Cretaceous Pakawau group, northwest Nelson

Wizevich, Michael C.; Thrasher, Glenn P.; Bussell, M. Royd; Wilson, Graeme J.; Collen, J. D.

doi:10.1080/00288306.1992.9514529

Cited by 17 publications

(20 citation statements)

References 5 publications

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“…In this study we have reviewed the already substantial literature on Late Cretaceous stratigraphy (Titheridge, 1977;Bussell, 1985;Wizevich et al, 1992;Bal and Lewis, 1994;Stark, 1996;Browne et al, 2008), paleontology Crosbie and Clowes, 1984;Raine, 1984;Hayward, 1985;Hayward and Raine, 1985;Pocknall et al, 1989;Crundwell et al, 1992;Kennedy et al, 2002;Higgs et al, 2004;Strong et al, 2004), and source rock potential (Thompson, 1982; Cook, 1987;Johnston et al, 1990;Thrasher, 1992b;Sykes and Dow, 2000;Sykes and Raine, 2008) for well and outcrop data. We include results from new outcrop studies, and petrographic analyses of selected outcrop and subcrop samples to illustrate the range of textures and compositions of Cretaceous sedimentary rocks present in the basin.…”

Section: Methodsmentioning

confidence: 99%

“…The North Cape Formation is widespread in the Taranaki Basin, yet has been penetrated by fewer than 20 wells to date. Siltstone and sandstone are the predominant lithologies in both outcrop and wells, but coals and conglomerate are locally prominent (Wainui and Puponga Members, Titheridge, 1977;Bussell, 1985;Wizevich et al, 1992;Bal and Lewis, 1994;King and Thrasher, 1996;Stark, 1996, andFresne Member, Thrasher, 1992a). These deposits represent shallow marine, paralic, and terrestrial environments formed during a major south-directed transgression at the end of the Cretaceous.…”

Section: Cretaceous Stratigraphymentioning

confidence: 98%

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Reservoir potential of Late Cretaceous terrestrial to shallow marine sandstones, Taranaki Basin, New Zealand

Higgs

Arnot

Browne

et al. 2010

Marine and Petroleum Geology

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Section: Methodsmentioning

confidence: 99%

Section: Cretaceous Stratigraphymentioning

confidence: 98%

Reservoir potential of Late Cretaceous terrestrial to shallow marine sandstones, Taranaki Basin, New Zealand

Higgs

Arnot

Browne

et al. 2010

Marine and Petroleum Geology

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“…Wizevich et al (1992) indicated that parts of the North Cape Formation had dinoflagellates, and contained marine sedimentological structures such as bimodal ripples, mud drapes, and rare burrows. Sykes & dow Kennedy (1993).…”

Section: A Marine Influence During Deposition?mentioning

confidence: 99%

“…Wizevich et al (1992) reported that a sample from the base of the North Cape Formation at the Wairoa River mouth contained a dinoflagellate cyst assemblage which indicated a late Haumurian age, either the Manumiella druggii or Alterbidinium acutulum Zones of Wilson (1984). Dinoflagellate cyst assemblages from outcropping North Cape Formation have recently been re-examined by Wilson (2004), who has taken into account refinements to the dinoflagellate cyst zonation made during the late 1990s (Roncaglia et al 1999;Crampton et al 2000), and concluded that the North Cape Formation spans the interval from the Palaeocystodinium granulatum Subzone of the Alterbidinium acutulum Zone to the top of the overlying Manumiella druggii Zone.…”

Section: Age Of Rakopi Formationmentioning

confidence: 99%

An outcrop‐based study of the economically significant Late Cretaceous Rakopi Formation, northwest Nelson, Taranaki Basin, New Zealand

Browne

Kennedy

Constable

et al. 2008

New Zealand Journal of Geology and Geophysics

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The Late Cretaceous Rakopi Formation (Pakawau Group) represents one of the most important petroleum source rock units and a potential reservoir unit in the highly prospective Taranaki Basin. This paper presents a predominantly outcrop-based study of the sedimentology, petrography, stratigraphy, and depositional environment of the Rakopi Formation in the Paturau River and Pakawau areas of northwest Nelson, southern Taranaki Basin, together with some preliminary insights into the stratigraphie architecture of the Pakawau Group on a more basin-wide scale.The Rakopi Formation is interpreted here as a terrestrial deposit, representing sedimentation in fluvial channels and their associated overbank and levee environments. However, the presence of dinoflagellates, glauconite, and elevated coal seam sulfur contents is evidence for periodic marine influence during deposition. This could be explained by a low-gradient coastal plain paleogeography, crossed by a series of rivers and their associated floodplain deposits, episodically inundated by marine incursions during successive transgressions. A modern analogue setting from the present-day Hauraki Graben, North Island, New Zealand, indicates that marine influence within coastal plain systems can extend several tens of kilometres inland. Given such a physiography, relatively small increases in relative sea level could potentially move the shoreline several kilometres or tens of kilometres farther inland, sufficient to introduce the type of marine influence on sedimentation that we suggest for the Rakopi Formation.The results from this study suggest a greater marine influence within the Rakopi Formation, northward into the greater Taranaki Basin, than has previously been recognised. This raises the possibility of both different reservoir facies as well as potentially a greater proportion of marine mudstones, which would have implications for both reservoir and trapping of hydrocarbons. In addition, marine-influenced coaly rocks within the Rakopi Formation are expected to have greater petroleum generative potentials and to be more oil-prone than their fully non-marine counterparts.

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“…Syn-rift Pakawau Group sediments overlie basement west of the Wakamarama Fault where they form up to 4000 m of terrestrial and shallow marine strata of Haumurian (Maastrichtian) age (Wizevich et al 1992). These are overlain by Paleocene terrestrial beds of the Kapuni Group, which in turn are overlain unconformably by calcareous marine strata of the Ngatoro Group (King 1988;Thrasher 1992).…”

Section: Geological Setting and Stratigraphymentioning

confidence: 99%

Bryozoan fauna of the Kaipuke siltstone, northwest Nelson: A Miocene homologue of the modern Tasman Bay coralline bryozoan grounds

Gordon

Stuart

Collen

1994

New Zealand Journal of Geology and Geophysics

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The Kaipuke Siltstone Formation (Westhaven Group) near the Anatori River mouth, northwest Nelson, contains a reasonably well preserved bryozoan fauna of Otaian age. Analysis of this fauna has yielded six species of Cheilostomatida, mostly with an erect-rigid colony form. One new species, Hippoporina miocenica, is described. F-' our of the species appear conspecific with modern hryozoans, including the two species (Celleporaria agglutinans (Hutton) and Hippomenella vellicata (Hutton)) that dominate the modern Tasman Bay bryozoan grounds. From foraminiferal evidence and from what is known of the ecological requirements of the modern bryozoan species it is possible to infer the paleoenvironment of the Kaipuke Siltstone fauna, viz, an area of near-oceanic salinity, water movements able to exceed 0.3 m/s, a seasonal temperature range probably c. 12.5-17°C, and with the possibility of terrigenous sediment accumulation. We conclude that this tauna is an early Miocene homologue of the present-day, ecologically important "Tasman Bay coral" and that this biotope has persisted for at least 20-22 Ma.

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Evidence for marine deposition in the Late Cretaceous Pakawau group, northwest Nelson

Cited by 17 publications

References 5 publications

Reservoir potential of Late Cretaceous terrestrial to shallow marine sandstones, Taranaki Basin, New Zealand

Reservoir potential of Late Cretaceous terrestrial to shallow marine sandstones, Taranaki Basin, New Zealand

An outcrop‐based study of the economically significant Late Cretaceous Rakopi Formation, northwest Nelson, Taranaki Basin, New Zealand

Bryozoan fauna of the Kaipuke siltstone, northwest Nelson: A Miocene homologue of the modern Tasman Bay coralline bryozoan grounds

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