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Thiede, Jörn (1971): Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin. PANGAEA, https://doi.org/10.1594/PANGAEA.548409, Supplement to: Thiede, J (1971): Planktonische Foraminiferen in Sedimenten vom ibero-marokkanischen Kontinentalrand. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C7, 15-102

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Abstract:
Recent clays cover the East Atlantic continental slopes. They are gray and poor in sand off Portugal (Cape Sines), but reddish brown to reddish gray and richer in sand off Morocco (Cape Mazagan).
The majority of the 19 sediment cores, which were taken mainly on two profiles (Fig. 3), can be correlated by means of planktonic foraminifera (Figs. 27, 28). The following parameters seem to be well suited for this purpose: qualitative and quantitative distribution of the planktonic foraminiferal species and faunas, coiling ratios of three Globorotalia-species: G. crassaformis, G. hirsuta and G. truncatulinoides.
Sediments from about 2000 m water depth show highest sedimentation rates off Portugal (> 20 cm/1000 yrs.), but off Morocco the lowest sedimentation rates (about 3 cm/1000 yrs.). The sediments are dated with planktonic foraminifera and 31 radiocarbon analyses and the stratigraphic interpretation is supported by the lithostratigraphy.
Holocene faunas are distinguished from the Pleistocene ones by differences in species composition, lower dominances and higher diversities. The Holocene sediments show smaller differences of the foraminiferal numbers than the Pleistocene ones.
During Holocene and Pleistocene the temperatures of the surface water masses (indicated by the planktonic foraminiferal faunas) show similar values nearshore and offshore off Morocco. Likewise, there is no apparent temperature gradient in the Pleistocene off Portugal; whereas here values increase offshore during the Holocene. The proportion of species indicating warmer water masses is generally higher off Morocco.
The plankton/benthos ratio increases with water depth and reaches maximum values already at about 1000 m.
The production rate for planktonic foraminifera is higher in the continental slope regions than in the open ocean, but their shells show typical solution phenomena already in water depths of less than 1000 m. A higher solutional rate was found in sediments from the Tagus Abyssal Plain, while sediments from Horse Shoe and Seine Abyssal Plain seem to be better preserved. In the Tagus Abyssal Plain solution is less important during late Pleistocene than during Holocene.
Coverage:
Median Latitude: 37.074986 * Median Longitude: -9.963474 * South-bound Latitude: 33.620000 * West-bound Longitude: -10.083000 * North-bound Latitude: 37.750000 * East-bound Longitude: -9.408333
Date/Time Start: 1967-02-07T06:30:00 * Date/Time End: 1967-02-07T10:54:00
Event(s):
M8_016-2 (M8/16-2 M8016B) * Latitude: 33.849800 * Longitude: -9.717000 * Elevation: -4354.0 m * Location: Cape Blanc/Meteor Bank/Portugal * Campaign: M8 (Atlantische Kuppenfahrten 1967/1-3) * Basis: Meteor (1964)
M8_017-2 (M8017B) * Latitude: 33.620000 * Longitude: -9.408333 * Elevation: -3016.0 m * Method/Device: Kasten corer (KAL)
M8_057-2 (M8057B) * Latitude: 37.683000 * Longitude: -10.083000 * Date/Time Start: 1967-02-07T06:30:00 * Date/Time End: 1967-02-07T10:54:00 * Elevation: -2811.0 m * Recovery: 3.69 m * Location: North Atlantic Ocean * Campaign: M8 (Atlantische Kuppenfahrten 1967/1-3) * Basis: Meteor (1964) * Method/Device: Kasten corer (KAL)
Size:
14 datasets

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Datasets listed in this publication series

  1. Thiede, J (1971): Benthic and planktic foraminifera abundance of the medium sand fraction in sediment core M8_057-2, Ibero-Moroccan continental margin (Table 3b). https://doi.org/10.1594/PANGAEA.112384
  2. Thiede, J (1971): Distribution of planktic foraminifera (112-200 µm) of sediment core M8_057-2 (Table 5). https://doi.org/10.1594/PANGAEA.112392
  3. Thiede, J (1971): Distribution of planktic foraminifera (200-630 µm) of sediment core M8_057-2 (Table 4). https://doi.org/10.1594/PANGAEA.112391
  4. Thiede, J (1971): Fine sand fraction analysis, biogenic fraction, of sediment core M8_057-2 (Table 3b). https://doi.org/10.1594/PANGAEA.112381
  5. Thiede, J (1971): Fine sand fraction analysis, foraminifera fraction, of sediment core M8_057-2 (Table 3b). https://doi.org/10.1594/PANGAEA.112383
  6. Thiede, J (1971): Medium sand fraction analysis, biogenic fraction, of sediment core M8-057-2 (Table 3b). https://doi.org/10.1594/PANGAEA.112382
  7. Thiede, J (1971): Radiocarbon (14C) age data and corrections of sediment core M8_017-2 (Table 7). https://doi.org/10.1594/PANGAEA.112403
  8. Thiede, J (1971): Radiocarbon (14C) age data and corrections of sediment core M8_057-2 (Table 7). https://doi.org/10.1594/PANGAEA.112404
  9. Thiede, J (1971): Radiocarbon (14C) age data and corrections of sediment core M8_058-2 (Table 7). https://doi.org/10.1594/PANGAEA.112405
  10. Thiede, J (1971): Radiocarbon (14C) age data and corrections of sediment core M8_066-2 (Table 7). https://doi.org/10.1594/PANGAEA.112406
  11. Thiede, J (1971): Radiocarbon (14C) age determinations on sediment core M8_016-2 (Table 7). https://doi.org/10.1594/PANGAEA.112401
  12. Thiede, J (1971): Sand fraction analysis of sediment core M8_057-2 (Table 3b). https://doi.org/10.1594/PANGAEA.112390
  13. Thiede, J (1971): Total fine sand fraction analysis of sediment core M8_057-2 (Table 3b). https://doi.org/10.1594/PANGAEA.112385
  14. Thiede, J (1971): Total medium sand fraction analysis of sediment core M8_057-2 (Table 3b). https://doi.org/10.1594/PANGAEA.112386