An integrated biostratigraphy, magnetostratigraphy and oxygen isotope stratigraphy for the late Neogene of New Zealand

Author(s): Edwards, Anthony R.
Author Affiliation(s): Primary:
N.Z. Geol. Surv., Dep. Sci. and Ind. Res., Lower Hutt, New Zealand
Source: Record - New Zealand Geological Survey, No.23, 76p. Publisher: New Zealand Geological Survey, Lower Hutt, New Zealand. ISSN: 0112-465X
Note: In English. 176 refs.
Summary: The biostratigraphic and magnetostratigraphic interpretations of five thick New Zealand late Neogene marine sequences are reconciled using a substantially improved regional biostratigraphy primarily based on planktonic foraminiferal and, to a lesser extent, calcareous nannofossil and benthonic foraminiferal bioevents. This reconcilliation also takes into account the latest available lithostratigraphic, radiometric and, especially, stable isotopic information on these and other New Zealand sequences. The main key to this revision was provided by the wealth of data available from the intensively studied late Neogene pelagic sequence recovered at Deep Sea Drilling Project (DSDP) Site 284 on the nearby Challenger Plateau. ...A conspicuous oxygen isotope shift of about 0.5 per mil occurred about 2.4m.y. ago in the late Pliocene of upper bathyal DSDP Site 284. It appears to have resulted from a substantial modification in the characteristics of Antarctic Intermediate Water and probably coincides with (1) the intrusion into central New Zealand of macrofossils now restricted to subantarctic water masses, (2) a marked (widespread) marine regression in Hawke's Bay and less certainly, (3) the Porika Glaciation, the second oldest known in the New Zealand region. Additionally six minor late Miocene stable isotope oscillations of probable glacio-eustatic origin are noted together with their apparent periodicity of about 0.18 m.y.
Year of Publication: 1987
Research Program: DSDP Deep Sea Drilling Project
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Australasia; Benthic taxa; Biostratigraphy; Blind River; Cenozoic; Challenger Plateau; DSDP Site 284; Deep Sea Drilling Project; Foraminifera; Invertebrata; Isotopes; Leg 29; Lithostratigraphy; Magnetostratigraphy; Mangaopari Stream; Mangapoike River; Marine environment; Microfossils; Nannofossils; Neogene; New Zealand; O-18/O-16; Oxygen; Pacific Ocean; Paleocirculation; Paleoclimatology; Paleoenvironment; Paleomagnetism; Planktonic taxa; Plantae; Protista; Sedimentary rocks; South Pacific; Southwest Pacific; Stable isotopes; Stratigraphy; Tasman Sea; Tertiary; Thallophytes; Upper Neogene; West Pacific
Coordinates: S403029 S403029 E1674049 E1674049
Record ID: 1990019492
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by Institute of Geological and Nuclear Sciences Limited (GNS Science), Lower Hutt, New Zealand