Magnetostratigraphic, lithostratigraphic and tephrostratigraphic constraints on lower and middle Pleistocene sea-level changes, Wanganui Basin, New Zealand

Author(s): Pillans, Brad J.; Roberts, Andrew P.; Wilson, Gary S.; Abbott, Stephen T.; Alloway, Brent V.
Author Affiliation(s): Primary:
Victoria University of Wellington, Research School of Earth Sciences, Wellington, New Zealand
University of California at Davis, Davis, CA, United States
University of Tasmania, Hobart, Tasmania, Australia
University of Auckland, Auckland, New Zealand
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 121(1-2), p.81-98. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. Includes appendix. 49 refs.; illus. incl. strat. cols., 2 tables, sketch map
Summary: Wanganui Basin, North Island, New Zealand, contains a complex sedimentary record of Lower and Middle Pleistocene sea-level changes. Palaeomagnetic results allow identification of the Matuyama/Brunhes transition, the Jaramillo Subchron and the Cobb Mountain Subchron. Correlations of rhyolitic tuff horizons across the basin are consistent with magnetostratigraphic correlations between sections. Isothermal plateau fission-track (ITPFT) ages of 1.05±0.05 Ma and 1.63±0.15 Ma on two tuffs (Potaka Pumice and Pakihikura Pumice, respectively) are consistent with the interpreted magnetostratigraphy and also with the astronomically tuned timescale of ODP Site 677. Magnetostratigraphy and ITPFT ages allow correlation of sedimentary cycles at Wanganui with odd-numbered oxygen isotope stages 17-31 in deep-sea cores. The stratotype section for the New Zealand Castlecliffian Stage is shown to be incomplete relative to other studied sections in the basin. Below stage 31, the character of the cyclothems changes at Wanganui, from marine dominated, to a greater representation of non-marine and estuarine strata. This change may be partly related to a change in amplitude and frequency of climatic cycles identified in oxygen isotope records, but the primary cause is likely to be increased basinal uplift.
Year of Publication: 1994
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Australasia; Brunhes Chron; Cenozoic; Changes of level; Cobb Mountain Event; Correlation; Cycles; DSDP Site 593; Deep Sea Drilling Project; Demagnetization; Electron probe data; Fission-track dating; Geochronology; IPOD; Igneous rocks; Jaramillo Subchron; Leg 111; Leg 90; Lithostratigraphy; Lower Pleistocene; Magnetic declination; Magnetic inclination; Magnetization; Magnetostratigraphy; Matuyama Chron; Middle Pleistocene; Natural remanent magnetization; New Zealand; North Island; ODP Site 677; Ocean Drilling Program; Pakihikura Pumice; Paleoclimatology; Paleomagnetism; Pleistocene; Potaka Pumice; Pyroclastics; Quaternary; Rangitikei New Zealand; Remagnetization; Remanent magnetization; Rhyolitic composition; Stratigraphy; Stratotypes; Tephrochronology; Thermal demagnetization; Tuff; Turakina New Zealand; Uplifts; Upper Cenozoic; Upper Quaternary; Volcanic rocks; Wanganui Basin; Whangaehu New Zealand
Coordinates: S420000 S390000 E1780000 E1740000
Record ID: 1994020707
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands