Benthic foraminiferal proxy evidence for the Neogene palaeoceanographic history of the Southwest Pacific, east of New Zealand

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doi: 10.1016/S0025-3227(04)00022-2
Author(s): Hayward, Bruce W.; Grenfell, Hugh R.; Carter, Rowan; Hayward, Jessica J.
Author Affiliation(s): Primary:
University of Auckland, Department of Geology, Auckland, New Zealand
National Institute of Water and Atmosphere, New Zealand
James Cook University, Australia
Geomarine Research, New Zealand
North Shore City Council, New Zealand
Volume Title: Cenozoic oceanographic evolution of the SW Pacific gateway; papers resulting from work on the cores drilled on Ocean Drilling Program Leg 181 to the Southwest Pacific east of New Zealand in August-October 1998
Volume Author(s): McCave, I. N., editor; Carter, L.; Carter, R. M.; Hayward, B. W.
Source: Cenozoic oceanographic evolution of the SW Pacific gateway; papers resulting from work on the cores drilled on Ocean Drilling Program Leg 181 to the Southwest Pacific east of New Zealand in August-October 1998, edited by I. N. McCave, L. Carter, R. M. Carter and B. W. Hayward. Marine Geology, 205(1-4), p.147-184. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. Includes appendix. 103 refs.; illus., incl. strat. col., 4 tables, geol. sketch maps
Summary: Canonical correspondence analysis indicates that the distribution of Neogene benthic foraminiferal faunas (>63 µm) in seven DSDP and ODP sites (500-4500 m water depth) east of New Zealand (38-51°S, 170°E-170°W) is most strongly influenced by depth (water mass stratification), and secondly by age (palaeoceanographic changes influencing faunal composition and biotic evolution). Stratigraphic faunal changes are interpretted in terms of the pulsed sequential development of southern, and later northern, polar glaciation and consequent cooling of bottom waters, increased vertical and lateral stratification of ocean water masses, and increased overall and seasonal surface water productivity. Oligocene initiation of the Antarctic Circumpolar Current and Deep Western Boundary Current (DWBC), flowing northwards past New Zealand, resulted in extensive hiatuses throughout the Southwest Pacific, some extending through into the Miocene. Planktic foraminiferal fragmentation index values indicate that carbonate dissolution was significant at abyssal depths throughout most of the Neogene, peaking at upper abyssal depths in the late Miocene (11-7 Ma), with the lysocline progressively deepened thereafter. Miocene abyssal faunas are dominated by Globocassidulina subglobosa and Oridorsalis umbonatus, with increasing Epistominella exigua after 16 Ma at upper abyssal depths. Peak abundances of Epistominella umbonifera indicate increased input of cold Southern Component Water to the DWBC at 7-6 Ma. Faunal association changes imply establishment of the modern Oxygen Minimum Zone (upper Circumpolar Deep Water) in the latest Miocene. Significant latitudinal differences between the benthic foraminiferal faunas at lower bathyal depths indicate the existence of an oceanic front along the Chatham Rise (location of present Subtropical Front), since the early late Miocene at least, with more pulsed productivity (higher E. exigua) along the south side. Modern Antarctic Intermediate Water faunal associations were established north of the Chatham Rise at 10-9 Ma, and south of it at 3-1.5 Ma. Middle-upper bathyal faunas on the Campbell Plateau are dominated by reticulate bolivinids during the early and middle Miocene, indicative of sustained productivity above relatively sluggish, suboxic bottom waters. Faunal changes and hiatuses indicate increased current vigour over the Campbell Plateau from the latest Miocene on. Surface water productivity (food supply) appears to have increased in three steps (at times of enhanced global cooling) marked by substantially increased relative abundance of: (1) Abditodentrix pseudothalmanni, Alabaminella weddellensis, Cassidulina norvangi (16-15 Ma, increased pulsed productivity); (2) Bulimina marginata f. aculeata, Nonionella auris, Trifarina angulosa, Uvigerina peregrina (3-1.5 Ma, increased overall productivity); and (3) Cassidulina carinata (1-0.5 Ma, increased overall productivity). Three intervals of deep-sea benthic foraminiferal taxonomic turnover are recognised (16-15, 11.5-10, 2-0.5 Ma) corresponding to intervals of enhanced global cooling and possible productivity changes. The late Pliocene-middle Pleistocene extinction, associated with increasing Northern Hemisphere glaciation, culminating in the middle Pleistocene climatic transition, was more significant in the study area than the earlier Neogene turnovers. Abstract Copyright (2004) Elsevier, B.V.
Year of Publication: 2004
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Benthic taxa; Biostratigraphy; Campbell Plateau; Cenozoic; Chatham Rise; Cluster analysis; Cores; DSDP Site 594; Deep Sea Drilling Project; Depositional environment; Foraminifera; IPOD; Invertebrata; Leg 181; Leg 90; Lithofacies; Marine environment; Microfossils; Neogene; ODP Site 1120; ODP Site 1121; ODP Site 1122; ODP Site 1123; ODP Site 1124; ODP Site 1125; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleocirculation; Paleoecology; Productivity; Protista; South Pacific; Southwest Pacific; Statistical analysis; Taxonomy; Tertiary; West Pacific
Coordinates: S453129 S453128 E1745653 E1745652
S505353 S505353 E1765952 E1765952
S500349 S500349 E1732218 E1732218
S463447 S463447 W1772337 W1772337
S414710 S414710 W1712956 W1712956
S423259 S423259 W1780959 W1780959
S392954 S392954 W1763154 W1763154
Record ID: 2004057587
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands