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Keigwin, Lloyd D; Corliss, Bruce H (1986): Oxygen and carbon isotopic composition in Eocene and Oligocene planktonic and benthic foraminifera from DSDP sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.719183, Supplement to: Keigwin, LD; Corliss, BH (1986): Stable isotopes in late middle Eocene to Oligocene foraminifera. Geological Society of America Bulletin, 97(3), 335-345, https://doi.org/10.1130/0016-7606(1986)97%3C335:SIILME%3E2.0.CO;2

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Abstract:
Oxygen and carbon isotope ratios in Eocene and Oligocene planktonic and benthic foraminifera have been investigated from Atlantic, Indian, and Pacific Ocean locations. The major changes in Eocene-Oligocene benthic foraminiferal oxygen isotopes were enrichment of up to 1 per mil in 18O associated with the middle/late Eocene boundary and the Eocene/Oligocene boundary at locations which range from 1- to 4-km paleodepth. Although the synchronous Eocene-Oligocene 18O enrichment began in the latest Eocene, most of the change occurred in the earliest Oligocene. The earliest Oligocene enrichment in 18O is always larger in benthic foraminifera than in surface-dwelling planktonic foraminifera, a condition that indicates a combination of deep-water cooling and increased ice volume. Planktonic foraminiferal d18O does not increase across the middle/late Eocene boundary at our one site with the most complete record (Deep Sea Drilling Project Site 363, Walvis Ridge). This pattern suggests that benthic foraminiferal d18O increased 40 m.y. ago because of increased density of deep waters, probably as a result of cooling, although glaciation cannot be ruled out without more data.
Stable isotope data are averaged for late Eocene and earliest Oligocene time intervals to evaluate paleoceanographic change. Average d18O of benthic foraminifera increased by 0.64 per mil from the late Eocene to the early Oligocene d18O maximum, whereas the average increase for planktonic foraminifera was 0.52 per mil. This similarity suggests that the Eocene/Oligocene boundary d18O increase was caused primarily by increased continental glaciation, coupled with deep sea cooling by as much as 2°C at some sites. Average d18O of surface-dwelling planktonic foraminifera from 14 upper Eocene and 17 lower Oligocene locations, when plotted versus paleo-latitude, reveals no change in the latitudinal d18O gradient. The Oligocene data are offset by ~0.45 per mil, also believed to reflect increased continental glaciation. At present, there are too few deep sea sequences from high latitude locations to resolve an increase in the oceanic temperature gradient from Eocene to Oligocene time using oxygen isotopes.
Further details:
GSA data repository - Appendix I - Eocene-Oligocene data tables, Appendix II - Paleodepth determination
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 1.604262 * Median Longitude: -155.069514 * South-bound Latitude: -52.223800 * West-bound Longitude: 9.046700 * North-bound Latitude: 57.496000 * East-bound Longitude: -8.810300
Date/Time Start: 1968-11-02T00:00:00 * Date/Time End: 1983-08-26T00:00:00
Event(s):
2-10 * Latitude: 32.862200 * Longitude: -52.215300 * Date/Time: 1968-11-02T00:00:00 * Elevation: -4712.0 m * Penetration: 459 m * Recovery: 76.3 m * Location: North Atlantic/CONT RISE * Campaign: Leg2 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 153.9 m cored; 18.2 m drilled; 49.6 % recovery
3-19 * Latitude: -28.534700 * Longitude: -23.677200 * Date/Time: 1969-01-07T00:00:00 * Elevation: -4677.0 m * Penetration: 145.2 m * Recovery: 96.5 m * Location: South Atlantic/RIDGE * Campaign: Leg3 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 103.8 m cored; 0 m drilled; 93 % recovery
9-77B * Latitude: 0.481700 * Longitude: -133.228300 * Date/Time: 1969-12-15T00:00:00 * Elevation: -4291.0 m * Penetration: 481.2 m * Recovery: 434.5 m * Location: North Pacific/HILL * Campaign: Leg9 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 463 m cored; 3.1 m drilled; 93.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
21 datasets

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Datasets listed in this publication series

  1. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 2-10 sediments. https://doi.org/10.1594/PANGAEA.718941
  2. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 3-19 sediments. https://doi.org/10.1594/PANGAEA.718944
  3. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 9-77B sediments. https://doi.org/10.1594/PANGAEA.718963
  4. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 10-94 sediments. https://doi.org/10.1594/PANGAEA.718964
  5. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 12-116 sediments. https://doi.org/10.1594/PANGAEA.718942
  6. Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 17-167 sediments. https://doi.org/10.1594/PANGAEA.718943
  7. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 22-214 sediments. https://doi.org/10.1594/PANGAEA.718945
  8. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 22-217 sediments. https://doi.org/10.1594/PANGAEA.718946
  9. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 23-219 sediments. https://doi.org/10.1594/PANGAEA.718949
  10. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 26-253 sediments. https://doi.org/10.1594/PANGAEA.718950
  11. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 29-277 sediments. https://doi.org/10.1594/PANGAEA.718951
  12. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 31-292 sediments. https://doi.org/10.1594/PANGAEA.718952
  13. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 39-357 sediments. https://doi.org/10.1594/PANGAEA.718954
  14. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 40-362 sediments. https://doi.org/10.1594/PANGAEA.718955
  15. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 40-363 sediments. https://doi.org/10.1594/PANGAEA.718956
  16. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 41-366 sediments. https://doi.org/10.1594/PANGAEA.718957
  17. Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 48-401 sediments. https://doi.org/10.1594/PANGAEA.718958
  18. Keigwin, LD (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 80-548 sediments. https://doi.org/10.1594/PANGAEA.718959
  19. Keigwin, LD (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 90-592 sediments. https://doi.org/10.1594/PANGAEA.718960
  20. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 90-593 sediments. https://doi.org/10.1594/PANGAEA.718961
  21. Keigwin, LD; Corliss, BH (1986): (Appendix 1) Oxygen and carbon isotopic composition in foraminifera from DSDP Hole 95-612 sediments. https://doi.org/10.1594/PANGAEA.718962