Wei, Wuchang (1991): Census of calcareous nannofossil taxa expressed as percent of total number of individuals counted, ODP Legs 113, 114, 119, 120 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712626, Supplement to: Wei, W (1991): Evidence for an earliest Oligocene abrupt cooling in the surface waters of the Southern Ocean. Geology, 19(8), 780-783, https://doi.org/10.1130/0091-7613(1991)019%3C0780:EFAEOA%3E2.3.CO;2
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Abstract:
Quantitative analysis of upper Eocene-upper Oligocene calcareous nannofossil assemblages from five Ocean Drilling Program sites in the Atlantic and Indian Ocean sectors of the Southern Ocean reveals an abrupt increase in cool-water taxa at the top of magnetic Subchron C13R ca. 35.9 Ma, coincident with an enrichment of ~1‰ d18O in the planktonic foraminifers at these sites. The synchrony of the abrupt increase in cool-water taxa in the Southern Ocean renders this event a useful biostratigraphic datum at southern high latitudes. This earliest Oligocene cool-water taxa increase was the sharpest and largest during the late Eocene-late Oligocene interval and indicates a drop in surface-water temperature of more than 3°C in the Southern Ocean. This suggests that the earliest Oligocene d18O shift represents primarily a temperature signal; a small portion (~0.2‰) is attributable to a global ice-volume increase.
Further details:
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -56.626000 * Median Longitude: 27.982190 * South-bound Latitude: -64.517000 * West-bound Longitude: -30.677000 * North-bound Latitude: -47.051000 * East-bound Longitude: 80.595000
Date/Time Start: 1987-01-15T00:00:00 * Date/Time End: 1988-03-23T00:00:00
Event(s):
113-689 * Latitude: -64.517000 * Longitude: 3.100150 * Date/Time Start: 1987-01-15T00:00:00 * Date/Time End: 1987-01-19T00:00:00 * Elevation: -2091.0 m * Penetration: 470.5 m * Recovery: 375.3 m * Location: South Atlantic Ocean * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 49 cores; 450.1 m cored; 0 m drilled; 83.4% recovery
114-699 * Latitude: -51.542000 * Longitude: -30.677000 * Date/Time Start: 1987-03-20T00:00:00 * Date/Time End: 1987-03-26T00:00:00 * Elevation: -3716.0 m * Penetration: 518.1 m * Recovery: 356.5 m * Location: South Atlantic Ocean * Campaign: Leg114 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 56 cores; 518.1 m cored; 0 m drilled; 68.8% recovery
114-703 * Latitude: -47.051000 * Longitude: 7.894700 * Date/Time Start: 1987-04-21T00:00:00 * Date/Time End: 1987-04-24T00:00:00 * Elevation: -1807.0 m * Penetration: 377.4 m * Recovery: 192.3 m * Location: South Atlantic Ocean * Campaign: Leg114 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 41 cores; 377.4 m cored; 0 m drilled; 51% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets
Download Data
Datasets listed in this publication series
- Wei, W (1991): Census of calcareous nannofossil taxa expressed as percent of total number of individuals counted, ODP Site 113-689. https://doi.org/10.1594/PANGAEA.712621
- Wei, W (1991): Census of calcareous nannofossil taxa expressed as percent of total number of individuals counted, ODP Site 114-699. https://doi.org/10.1594/PANGAEA.712622
- Wei, W (1991): Census of calcareous nannofossil taxa expressed as percent of total number of individuals counted, ODP Site 114-703. https://doi.org/10.1594/PANGAEA.712623
- Wei, W (1991): Census of calcareous nannofossil taxa expressed as percent of total number of individuals counted, ODP Site 119-744. https://doi.org/10.1594/PANGAEA.712624
- Wei, W (1991): Census of calcareous nannofossil taxa expressed as percent of total number of individuals counted, ODP Site 120-748. https://doi.org/10.1594/PANGAEA.712625