Mixed glauconitic-carbonate-siliciclastic surficial sediments on the north Kaipara continental margin, northwestern North Island, New Zealand

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dc.contributor.authorPayne, Danielle Sarah
dc.contributor.authorNelson, Campbell S.
dc.contributor.authorHood, Steven D.
dc.date.accessioned2011-03-29T01:58:54Z
dc.date.available2011-03-29T01:58:54Z
dc.date.issued2010
dc.description.abstractA mosaic of siliciclastic and mixed carbonate-siliciclastic sediments and authigenic minerals occurs at shelf and slope depths (30-1015 m water depth) on the open, wave-dominated north Kaipara continental margin (NKCM) off northern New Zealand. Texture and composition define five surficial sediment facies. Facies 1 (siliciclastic sand) comprises generally well-sorted fine sands that extend to outer shelf depths. Facies 2 (glauconitic sand) is composed of 30-95% authigenic glauconite grains at 150-400 m water depth in central to northern portions of NKCM. Facies 3 (mixed bryozoan-siliciclastic sand) occurs only in northernmost NKCM and involves a conspicuous (>40%) bryozoan carbonate content. Facies 4 (pelletal mud) occupies the mid shelf (100-150 m water depth) in northern NKCM and consists of muddy sediment with >30% mixed carbonate-siliciclastic pellets of probable fecal origin. Facies 5 (foraminiferal mud and sand) contains >30% foraminiferal tests at slope depths in southern NKCM and at both slope and mid-outer shelf depths towards the north. The siliciclastic mineralogy is consistent with mainly distant provenances to the south of the NKCM in central North Island and northern South Island, while much of the bryozoan material is likely reworked from the Three Kings carbonate platform to the north. No single shelf sedimentation model explains the complex facies distributions on the NKCM because the deposits record the interplay of several present and past hydrodynamic and sediment supply controls. While truly modern deposits may occur inshore, the bulk of NKCM surficial sediments are mainly palimpsest and/or relict deposits.en_NZ
dc.identifier.citationPayne, D.S., Nelson, C.S. & Hood, S.D. (2010). Mixed glauconitic-carbonate-siliciclastic surficial sediments on the north Kaipara continental margin, northwestern North Island, New Zealand. New Zealand Journal of Geology and Geophysics, 53(4), 307-326.en_NZ
dc.identifier.doi10.1080/00288306.2010.498782en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5210
dc.language.isoen
dc.publisherTaylor & Francisen_NZ
dc.relation.isPartOfNew Zealand Journal of Geology and Geophysicsen_NZ
dc.relation.urihttp://www.informaworld.com/smpp/content~content=a931470932~db=all~jumptype=rssen_NZ
dc.subjectcarbonateen_NZ
dc.subjectcontinental margin sedimentationen_NZ
dc.subjectglauconiticen_NZ
dc.subjectKaiparaen_NZ
dc.subjectlittoral driften_NZ
dc.subjectNew Zealanden_NZ
dc.subjectNorth Islanden_NZ
dc.subjectNorthlanden_NZ
dc.subjectpalimpsest sedimentsen_NZ
dc.subjectprovenanceen_NZ
dc.subjectrelict sedimentsen_NZ
dc.subjectshelfen_NZ
dc.subjectsiliciclasticen_NZ
dc.subjectslopeen_NZ
dc.subjectsurficial sediment faciesen_NZ
dc.titleMixed glauconitic-carbonate-siliciclastic surficial sediments on the north Kaipara continental margin, northwestern North Island, New Zealanden_NZ
dc.typeJournal Articleen_NZ
pubs.begin-page307en_NZ
pubs.elements-id35664
pubs.end-page326en_NZ
pubs.issue4en_NZ
pubs.volume53en_NZ
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