Sequence stratigraphy of the Nukumaruan Stratotype (Pliocene-Pleistocene, c. 2.08–1.63 Ma), Wanganui Basin, New Zealand

Abbott, S.T., Naish, T.R., Carter, R. M., and Pillans, B.J. (2005) Sequence stratigraphy of the Nukumaruan Stratotype (Pliocene-Pleistocene, c. 2.08–1.63 Ma), Wanganui Basin, New Zealand. Journal of the Royal Society of New Zealand, 35 (1 & 2). pp. 123-150.

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Abstract

Late Pliocene to Early Pleistocene (c. 2.08—1.63 Ma) strata exposed in coastal cliffs along Nukumaru and Ototoka beaches near Wanganui, between the top of the Nukumaru Limestone and the base of the Butlers Shell Conglomerate, comprise 11 depositional sequences of a total thickness of c. 86 m. The sequences consist predominantly of silicilclastic shoreline facies. Non-marine facies (including palaeosols), and a variety of shallow-marine shellbed facies, are also represented. Patterns in facies composition and sequence architecture reveal three sequence motifs (Maxwell, Nukumaru, and Birdgrove) that represent progressively increasing maximum palaeowater depths within a broadly basin-margin palaeogeographic setting. The sequence motif changes systematically up section and records a lower order tectonic influence on accommodation that has modulated the stacking patterns of individual sequences. Correlation of the sequences with oxygen isotope stages 77–57 is achieved using the basin-wide Ototoka tephra, and indicates that the sequences accumulated in response to obliquity driven (41 k.y. duration) glacio-eustatic sea-level oscillations. Correlation of the Nukumaru coast sequences with other sections along basin strike, and the global oxygen isotope record indicates that (i) 500 k.y. (δ18O stages MIS 56–34) is missing at the unconformity between the Nukumaruan and overlying Castlecliffian stratotypes on the Wanganui coast, and (ii) the Pliocene-Pleistocene boundary lies within sequence NC7 at the base of the Lower Maxwell Formation.

Item ID: 6710
Item Type: Article (Refereed Research - C1)
Keywords: cyclothem; sequence; motif; systems tract; tephra; cyclostratigraphy; obliquity; glacio-eustasy; sea level; Pliocene; Pleistocene; Nukumaruan; Wanganui Basin; New Zealand
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ISSN: 1175-8899
Date Deposited: 12 Feb 2010 05:46
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040311 Stratigraphy (incl Biostratigraphy and Sequence Stratigraphy) @ 100%
SEO Codes: 96 ENVIRONMENT > 9699 Other Environment > 969999 Environment not elsewhere classified @ 100%
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