Major depositional events under the deep Pacific inflow

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doi: 10.1130/0091-7613(2002)030<0487:MDEUTD>2.0.CO;2
Author(s): Hall, Ian R.; Carter, Lionel; Harris, Sara E.
Author Affiliation(s): Primary:
Cardiff University, Department of Earth Sciences, Cardiff, United Kingdom
National Institute of Water and Atmospheric Research, Wellington, New Zealand
Sea Education Association, Woods Hole, MA, United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 30(6), p.487-490. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. 23 refs.; illus., incl. sketch map
Summary: The main inflow of deep water to the Pacific is via a deep western boundary current. As the current passes along the continental margin off eastern New Zealand, it receives much terrigenous sediment, which, together with the biogenic pelagic supply, has been reworked into a suite of large drifts. Ocean Drilling Program Site 1123 on the North Chatham Drift and Site 1124 on the Rekohu Drift have yielded high-resolution and well- dated records of carbonate and terrigenous fluxes for the past 3 m.y. Deposition at both drifts was affected by a deep western boundary current background sediment flux and by glacial-interglacial cycles. In addition, drifts received site-specific flux pulses caused by (1) sediment remobilization under a vigorous Antarctic Circumpolar Current, (2) increased oceanic productivity, (3) overspill of sediment from the newly formed Hikurangi Channel, and (4) generally increased discharge from the Hikurangi Channel under intensified Quaternary uplift and paleoclimatic oscillations.
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Antarctic Circumpolar Current; Australasia; Biogenic processes; Boundary currents; Carbonate sediments; Cenozoic; Clastic sediments; Continental margin sedimentation; Currents; Drift; Glacial sedimentation; Glaciomarine sedimentation; High-resolution methods; Hikurangi Channel; Leg 181; Marine sedimentation; Marine sediments; Neogene; New Zealand; North Chatham Drift; ODP Site 1123; ODP Site 1124; Ocean Drilling Program; Ocean circulation; Ocean currents; Pacific Ocean; Paleo-oceanography; Pliocene; Productivity; Quaternary; Regression analysis; Rekohu Drift; Sediment supply; Sedimentation; Sedimentation rates; Sediments; Statistical analysis; Subantarctic regions; Terrigenous materials; Tertiary
Coordinates: S414710 S414710 W1712956 W1712956
S392954 S392954 W1763154 W1763154
Record ID: 2002043003
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