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Dupont, Lydie M; Donner, Barbara; Schneider, Ralph R; Wefer, Gerold (2001): Palynological records from the Congo fan analyzed on ODP Site 175-1077 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.872026, Supplement to: Dupont, LM et al. (2001): Mid-Pleistocene environmental change in tropical Africa began as early as 1.05 Ma. Geology, 29(3), 195-198, https://doi.org/10.1130/0091-7613(2001)029%3C0195:MPECIT%3E2.0.CO;2

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Abstract:
Palynological records from the Congo fan reveal environmental change in equatorial Africa occurring 1.05 Ma ago, 100 k.y. before the mid-Pleistocene climatic shift at 0.9 Ma. Prior to 1.05 Ma, a glacial-interglacial rhythm is not obvious in the African vegetation variation. Afterwards, Podocarpus spread in the mountains of central Africa mainly during glacials and Congo River discharge decreased. The sequence of vegetation variation associated with the mid-Pleistocene glacials and interglacials differed from that observed during the late Pleistocene. Between 0.9 and 0.6 Ma, interglacials were characterized by warm dry conditions and glacials were characterized by cool humid conditions, while during the past 0.2 Ma glacials were cold and dry and interglacials warm and humid. Our data indicate that before the Northern Hemisphere ice caps dramatically increased in size (0.9?0.6 Ma), low-latitude climate forcing and response in the tropics played an important role in the initiation of 100 k.y. ice-age cycles. During the mid to late Pleistocene, however, the climate conditions in the tropics were increasingly influenced by the glacial-interglacial variations of continental ice sheets.
Further details:
Dupont, Lydie M; Jansen, J H Fred; Wefer, Gerold (2001): Composite depth of Site 175-1077. PANGAEA, https://doi.org/10.1594/PANGAEA.60352
Wefer, Gerold (2001): Composite depth of Site 175-1077. PANGAEA, https://doi.org/10.1594/PANGAEA.60348
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -5.010837 * Median Longitude: 10.281385 * South-bound Latitude: -5.179970 * West-bound Longitude: 10.074970 * North-bound Latitude: -4.785300 * East-bound Longitude: 10.436130
Date/Time Start: 1997-08-23T00:00:00 * Date/Time End: 1997-08-29T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Dupont, LM (2001): Pollen analysis of Site 175-1075 (part 1). https://doi.org/10.1594/PANGAEA.58100
  2. Dupont, LM (2001): Pollen analysis of Site 175-1075 (part 2). https://doi.org/10.1594/PANGAEA.58099
  3. Dupont, LM (2001): Spores and dinoflagellates of Site 175-1075. https://doi.org/10.1594/PANGAEA.58094
  4. Dupont, LM; Wefer, G (2001): Age model of Site 175-1077. https://doi.org/10.1594/PANGAEA.60350
  5. Dupont, LM; Donner, B; Schneider, RR et al. (2001): Stable carbon (13C) and stable oxygen (18O) isotopes of G.ruber (pink) from ODP Site 175-1077. https://doi.org/10.1594/PANGAEA.872025
  6. Dupont, LM; Wefer, G (2001): Sedimentation rate of Site 175-1077. https://doi.org/10.1594/PANGAEA.60351
  7. Dupont, LM; Donner, B; Schneider, RR et al. (2001): (Table 1) Age model for ODP Site 175-1077 based on oxygen isotopes of Globigerinoides ruber pink. https://doi.org/10.1594/PANGAEA.713256