Chemostratigraphic documentation of a complete Miocene intermediate-depth section in the Southern Ocean; Ocean Drilling Program Site 1120, Campbell Plateau off New Zealand

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doi: 10.1016/j.margeo.2010.10.012
Author(s): Ando, Atsushi; Khim, Boo-Keun; Nakano, Takanori; Takata, Hiroyuki
Author Affiliation(s): Primary:
Pusan National University, Division of Earth Environmental System, Pusan, South Korea
Other:
Rsearch Institute of Humanity and Nature, Japan
Shimane University, Japan
Volume Title: Marine Geology
Source: Marine Geology, 279(1-4), p.52-62. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. Supplemental information/data is available in the online version of this article. 44 refs.; illus., incl. sketch map
Summary: An integrated chemostratigraphic (87Sr/86Sr, δ13C and δ18O) study of benthic foraminifera is presented for a 210m-thick, intermediate depth (upper/middle bathyal transition), Miocene nannofossil ooze section of Ocean Drilling Program Site 1120, Campbell Plateau off New Zealand. Our results indicate that new 87Sr/86Sr, δ13C and δ18O profiles are wholly consistent with their respective Miocene reference curves. These observations facilitate identification of a total of five reliable chemostratigraphic datums, which are based on the fundamental structural changes in the 87Sr/86Sr curve and paired simultaneous δ13C and δ18O events. The resultant age-depth relationship clearly shows that the Miocene (20-5Ma) biopelagic sedimentation on the Campbell Plateau was essentially continuous at a moderate to high, linear sedimentation rate (17.5m/m.y. with an exception of the uppermost 13m). Our findings do not support the shipboard biostratigraphic age model, which assumes that the critical early-middle Miocene transition was interrupted by a major hiatus (< ∼3m.y.). Because of its unique bathymetric setting at a paleowater-depth of ∼600m, which is among the shallowest of the coeval isotopically studied deep-sea sections in the South Pacific/Southern Ocean, Site 1120 will serve as a reference section for surveying the evolution of intermediate-water paleoceanography in the Southern Hemisphere across the middle Miocene climatic transition. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Alkaline earth metals; Biostratigraphy; Biozones; Boreholes; C-13/C-12; Calcium carbonate; Campbell Plateau; Carbon; Cenozoic; Chemostratigraphy; Cores; Foraminifera; Invertebrata; Isotope ratios; Isotopes; Leg 181; Metals; Microfossils; Miocene; Nannofossils; Neogene; O-18/O-16; ODP Site 1120; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleocurrents; Paleoenvironment; Plantae; Protista; South Pacific; Southern Ocean; Southwest Pacific; Sr-87/Sr-86; Stable isotopes; Strontium; Tertiary; Unconformities; West Pacific
Coordinates: S500349 S500349 E1732218 E1732218
Record ID: 2011026381
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands