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Ruddiman, William F; Janecek, Thomas R (1989): Biogenic and terrigeneous components in Pliocene-Pleistocene sediments of the equatorial Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.746239, Supplement to: Ruddiman, WF; Janecek, TR (1989): Pliocene-Pleistocene biogenic and terrigenous fluxes at equatorial Atlantic Sites 662, 663, and 664. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 211-240, https://doi.org/10.2973/odp.proc.sr.108.165.1989

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Abstract:
High-resolution analyses of sediments at equatorial Atlantic Sites 662, 663, and 664 define the accumulation rates of biogenically produced CaC03 and opal and of eolian dust from North Africa over the last 3.7 m.y. The mean flux of opal increased abruptly by 60%-70% near 2.5 Ma (2.65 to 2.3 Ma), reflecting pulses of increased opal productivity along the equator due mainly to increased upwelling. The mean winter-plume dust influx from Sahelian and Saharan Africa also increased at this time by between 35% and 75%, following smaller increases earlier in the late Pliocene. The increased opal flux implies a stronger zonal component of the southern trade winds in Southern Hemisphere winter. Consistent with this wind configuration, the stronger dust flux suggests a weaker southwesterly monsoonal flow into Africa in Northern Hemisphere summer, thus increasing Sahelian aridity and winter-plume dust fluxes. Dust fluxes to the equator may possibly have also been enhanced by stronger Northern Hemisphere winter trade winds and a more southerly position of the Intertropical Convergence Zone over Africa.
These late Pliocene biogenic and terrigenous flux changes coincided with the appearance of Northern Hemisphere ice sheets, implying an ultimate causal link. The immediate control on changes in tropical circulation may, however, have been changes in the Atlantic sector of the Southern Ocean.
A steady background trend of increasing winter-plume dust flux occurred from the late Pliocene until the middle Pleistocene. This may reflect a progressive, tectonically induced aridification of northern and eastern Africa because of the gradual uplift of the Tibetan Plateau.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -0.693789 * Median Longitude: -16.636249 * South-bound Latitude: -1.390200 * West-bound Longitude: -23.227500 * North-bound Latitude: 0.107300 * East-bound Longitude: -11.739200
Date/Time Start: 1986-03-24T03:00:00 * Date/Time End: 1986-04-02T13:00:00
Event(s):
108-662A * Latitude: -1.390200 * Longitude: -11.739200 * Date/Time Start: 1986-03-24T03:00:00 * Date/Time End: 1986-03-25T07:45:00 * Elevation: -3824.0 m * Penetration: 200 m * Recovery: 203.87 m * Location: South Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 200 m cored; 0 m drilled; 101.9 % recovery
108-663A * Latitude: -1.197800 * Longitude: -11.878500 * Date/Time Start: 1986-03-26T17:30:00 * Date/Time End: 1986-03-27T13:45:00 * Elevation: -3706.0 m * Penetration: 147.2 m * Recovery: 119.05 m * Location: South Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 147.2 m cored; 0 m drilled; 80.9 % recovery
108-664B * Latitude: 0.107300 * Longitude: -23.227500 * Date/Time Start: 1986-03-30T23:30:00 * Date/Time End: 1986-03-31T23:09:00 * Elevation: -3806.0 m * Penetration: 247 m * Recovery: 245.02 m * Location: South Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 26 cores; 247 m cored; 0 m drilled; 99.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Ruddiman, WF; Janecek, TR (1989): (Table 4) Carbonate, opal, terrigenous fraction, and dry bulk density of ODP Hole 108-662A. https://doi.org/10.1594/PANGAEA.746235
  2. Ruddiman, WF; Janecek, TR (1989): (Table 5) Carbonate, opal, terrigenous fraction, and dry bulk density of ODP Hole 108-663A. https://doi.org/10.1594/PANGAEA.746236
  3. Ruddiman, WF; Janecek, TR (1989): (Table 3) Middle Pleistocene oxygen isotopic ratios drom the planktonic foraminifer Globigerinoides ruber at ODP Hole 108-663A. https://doi.org/10.1594/PANGAEA.746232
  4. Ruddiman, WF; Janecek, TR (1989): (Table 6) Carbonate, opal, terrigenous fraction, and dry bulk density of ODP Hole 108-664B. https://doi.org/10.1594/PANGAEA.746237
  5. Ruddiman, WF; Janecek, TR (1989): (Table 7) Carbonate, opal, terrigenous fraction, and dry bulk density of ODP Hole 108-664D. https://doi.org/10.1594/PANGAEA.746238
  6. Ruddiman, WF; Janecek, TR (1989): (Table 2) Datum levels of ODP Leg 108 site. https://doi.org/10.1594/PANGAEA.746231