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Diester-Haass, Lieselotte (1991): Eocene/Oligocene paleoceanography from ODP Hole 113-689B and Hole 113-690B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.759819, Supplement to: Diester-Haass, L (1991): Eocene/Oligocene paleoceanography in the Antarctic Ocean, Atlantic sector (Maud Rise, ODP Leg 113, Site 689B and 690B). Marine Geology, 100(1-4), 249-276, https://doi.org/10.1016/0025-3227(91)90235-V

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Abstract:
Middle Eocene to Late Oligocene sediments from near the crest (Site 689B, water depth 2080 m) and flank (water depth 2914 m) of the Maud Rise (62°S) have been investigated by coarse fraction analysis and have revealed the following:
(1) The middle Eocene (50-40 Ma) was a period of pure carbonate sedimentation, with good preservation of carbonate microfossils. No opal > 40 µm is present.
(2) In the late Eocene (40-36.5 Ma) opal fossils (mainly radiolaria, and some diatoms > 40 µm) appeared for the first time. Three maxima in opal sedimentation (Eocene/Oligocene boundary, middle early Oligocene and early/late Oligocene boundary) are separated by increases in carbonate sedimentation. The dissolution of carbonate fossils is strong in the opal-rich layers. Opal sedimentation is attributed to cooling and probably more vigorous atmospheric circulation and increased upwelling.
(3) Carbonate dissolution increased with water depth in the Oligocene, whereas in the middle Eocene excellent carbonate preservation in the deeper Site 690B and stronger dissolution in the shallower Site 689B is attributed to different bottom-water characteristics. The middle Eocene bottom water probably was formed by strong evaporation at low latitudes, whereas by the earliest Oligocene formation of Antarctic Bottom Water (AABW) had set in.
(4) Current influence, not on top but on the flank of the Maud Rise, could be recorded by means of larger grain sizes of benthonic and planktonic microfossils.
(5) Ice-rafted debris was not found. Quartz and other minerals are very rare and not larger than 125 µm and may have been supplied by ice as well as by wind or by deep currents. Mica contents were up to 10 times higher in the middle Eocene on the flank compared to on the crest of the Maud Rise, indicating deep current supply.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -64.839000 * Median Longitude: 2.152400 * South-bound Latitude: -65.161000 * West-bound Longitude: 1.204900 * North-bound Latitude: -64.517000 * East-bound Longitude: 3.099900
Date/Time Start: 1987-01-16T08:00:00 * Date/Time End: 1987-01-21T07:00:00
Event(s):
113-689B * Latitude: -64.517000 * Longitude: 3.099900 * Date/Time Start: 1987-01-16T08:00:00 * Date/Time End: 1987-01-18T06:45:00 * Elevation: -2091.0 m * Penetration: 297.3 m * Recovery: 229.45 m * Location: South Atlantic Ocean * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 297.3 m cored; 0 m drilled; 77.2 % recovery
113-690B * Latitude: -65.161000 * Longitude: 1.204900 * Date/Time Start: 1987-01-20T03:15:00 * Date/Time End: 1987-01-21T07:00:00 * Elevation: -2925.0 m * Penetration: 213.4 m * Recovery: 214.75 m * Location: South Atlantic Ocean * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 213.4 m cored; 0 m drilled; 100.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Diester-Haass, L (1991): (Table 8) Composition of the benthos from ODP Hole 113-689B. https://doi.org/10.1594/PANGAEA.759818
  2. Diester-Haass, L (1991): (Table 7) Benthonic/planktonic foraminiferal ratios and fragmentation of planktonic foraminifera from ODP Hole 113-689B. https://doi.org/10.1594/PANGAEA.759817
  3. Diester-Haass, L (1991): (Table 6) Composition of the sand fraction from ODP Hole 113-689B. https://doi.org/10.1594/PANGAEA.759816
  4. Diester-Haass, L (1991): (Table 5) Sand and 40-63 µm fraction from ODP Hole 113-689B. https://doi.org/10.1594/PANGAEA.759815
  5. Diester-Haass, L (1991): (Table 4) Composition of benthos from ODP Hole 113-690B. https://doi.org/10.1594/PANGAEA.759814
  6. Diester-Haass, L (1991): (Table 3) Benthonic/planktonic foraminiferal ratios and fragmentation of planktonic foraminifera from ODP Hole 113-690B. https://doi.org/10.1594/PANGAEA.759813
  7. Diester-Haass, L (1991): (Table 2) Composition of the sand fraction from ODP Hole 113-690B. https://doi.org/10.1594/PANGAEA.759812
  8. Diester-Haass, L (1991): (Table 1) Sand and 40-63 µm fraction in from ODP Hole 113-690B. https://doi.org/10.1594/PANGAEA.759811