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Quaternary isotope stratigraphy of DSDP Hole 90-593 from the Challenegr Plateau, South Tasman Sea

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.683884
Keywords
  • > 125 µM Size Fraction
  • 90-593
  • Age
  • Maximum/Old
  • Age
  • Minimum/Young
  • Age Max
  • Age Min
  • Bulk Nannoplankton
  • 4-25 µM Size Fraction
  • Cibicides Sp
  • D13C
  • Cibicides Sp
  • D18O
  • Cibicides Sp
  • D13C
  • Cibicides Sp
  • D18O
  • Coarse Sand/Fine Sand
  • Coarse Sand/Fine Sand Ratio
  • Coarse Sand > 125 µM
  • Fine Sand 63-125 µM
  • D13C
  • D18O
  • Deep Sea Drilling Project
  • Delta 13C
  • Delta 18O
  • Depth
  • Bottom/Max
  • Depth
  • Top/Min
  • Depth Bot
  • Depth Top
  • Drilling
  • Dsdp
  • G
  • Bulloides D13C
  • G
  • Bulloides D18O
  • Globigerina Bulloides
  • D13C
  • Globigerina Bulloides
  • D18O
  • Glomar Challenger
  • Grain Size
  • Sieving
  • Grain Size
  • Sieving/Settling Tube
  • Isotopic Stage
  • Label
  • Leg90
  • Mass Spectrometer Vg Micromass 602
  • Odp Sample Designation
  • Sample Code/Label
  • Sand/Mud
  • Sand/Mud Ratio
  • Sedimentation Rate
  • Sed Rate
  • South Pacific/Tasman Sea/Plateau
  • Stage
  • Uvigerina Sp
  • D13C
  • Uvigerina Sp
  • D18O
  • Uvigerina Sp
  • D13C
  • Uvigerina Sp
  • D18O
Disciplines
  • Archaeology
  • Earth Science

Abstract

A moderate-resolution isotope stratigraphy (with an average of one sample per 17,500 yr.) derived from the benthic foraminifer Uvigerina (or Cibicides), the planktonic foraminifer Globigerina bulloides, and calcareous nannofossil concentrates is presented for the entire Quaternary (and latest Pliocene) section of mid-upper bathyal calcareous oozes from DSDP Site 593, western Challenger Plateau, south Tasman Sea. Superimposed on a trend of gradually increasing average delta18O values through the Pleistocene, reflecting the progressive buildup of polar ice sheets, is a record of highfrequency but generally low amplitude (0.5-1?) isotope fluctuations in the early Quaternary (1.9-1.0 m.y.), followed by a greatly increased intensity (1.5-2.0 ?) of glacial-interglacial fluctuations during the late Quaternary (< 1.0 m.y.). The standard late Quaternary isotope stages 1 to 24 are mainly resolvable. Significant excursions in both delta18O and delta13C values at various times during the Quaternary are suggested to be due to periodic, fundamental changes in ocean circulation properties over the plateau. For example, intensified upwelling of Antarctic Intermediate Waters during several glacial periods is indicated by the convergence of benthic and planktonic foraminiferal delta18O data, and productivity variations may account for certain delta13C spikes in the record. With increasingly higher resolution analysis this core will provide a useful Quaternary isotope reference section for southern temperate waters in the southwest Pacific, centered on New Zealand.

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