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Powell, A J; Dodge, J D; Lewis, Jane (1990): Late Neogene to Pleistocene palynology of ODP Leg 112 samples [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.753567, Supplement to: Powell, AJ et al. (1990): Late Neogene to Pleistocene palynological facies of the Peruvian Continental Margin upwelling, Leg 112. In: Suess, E; von Huene, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 112, 297-321, https://doi.org/10.2973/odp.proc.sr.112.196.1990

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Abstract:
The main objectives of this study are (1) to characterize the spatial and temporal variations in organic matter deposited in upwelling and related sediments (manifest in the palynoclast and organic-walled microplankton assemblages) and (2) to relate these variations to paleoenvironmental changes.
A total of 40 samples from Holes 679D, 680B, 681B, 684B, 686B, and 687B were analyzed. Without exception, amorphogen dominates the palynoclast assemblages overwhelmingly. Influx of terrestrial particulate organic matter to the marine realm was extremely low. Levels of amorphogen swamp other palynoclast categories, and little significance can be attached to any variations observed. Microplankton dominate the palynomorph assemblages, with variable levels of subordinate foraminiferal test linings. Miospores are rare and are absent in most samples. Foraminiferal test linings are particularly abundant in the shallowest samples, which may reflect low surface-water paleotemperatures. Cysts of heterotrophic peridiniacean dinoflagellates (P-cysts) dominate the microplankton assemblages, with variable levels of cysts of autotrophic gonyaulacacean dinoflagellates (G-cysts). Samples dominated by P-cysts are derived largely from laminated, unbioturbated units deposited under the influence of strong upwelling. A lower abundance of P-cysts in some samples is restricted to unlaminated, bioturbated units deposited under oxygenated conditions. We conclude that the ratio of P-cysts to G-cysts is a useful indicator of variable upwelling strength. Detailed study of the variations in the microplankton assemblages offers one the greatest potential for palynological characteriztion and understanding of the upwelling system.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -11.545484 * Median Longitude: -78.037466 * South-bound Latitude: -13.480160 * West-bound Longitude: -79.955830 * North-bound Latitude: -8.991500 * East-bound Longitude: -76.891500
Date/Time Start: 1986-11-01T12:45:00 * Date/Time End: 1986-12-05T06:00:00
Event(s):
112-679D * Latitude: -11.063830 * Longitude: -78.272170 * Date/Time Start: 1986-11-01T12:45:00 * Date/Time End: 1986-11-02T13:15:00 * Elevation: -462.0 m * Penetration: 245.4 m * Recovery: 116.03 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 245.2 m cored; 0 m drilled; 47.3 % recovery
112-680B * Latitude: -11.065000 * Longitude: -78.077830 * Date/Time Start: 1986-11-05T20:30:00 * Date/Time End: 1986-11-06T14:30:00 * Elevation: -273.0 m * Penetration: 195.5 m * Recovery: 98.45 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 195.5 m cored; 0 m drilled; 50.4 % recovery
112-681B * Latitude: -10.976660 * Longitude: -77.957670 * Date/Time Start: 1986-11-08T00:00:00 * Date/Time End: 1986-11-08T13:15:00 * Elevation: -162.0 m * Penetration: 143.5 m * Recovery: 97.3 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 143.5 m cored; 0 m drilled; 67.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
11 datasets

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Datasets listed in this publication series

  1. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 6) Dinoflagellate cyst species distribution in ODP Hole 112-679D. https://doi.org/10.1594/PANGAEA.753561
  2. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 7) Dinoflagellate cyst species distribution in ODP Hole 112-680B. https://doi.org/10.1594/PANGAEA.753562
  3. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 8) Dinoflagellate cyst species distribution in ODP Hole 112-681B. https://doi.org/10.1594/PANGAEA.753563
  4. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 9) Dinoflagellate cyst species distribution in ODP Hole 112-684B. https://doi.org/10.1594/PANGAEA.753564
  5. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 10) Dinoflagellate cyst species distribution in ODP Hole 112-686B. https://doi.org/10.1594/PANGAEA.753565
  6. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 11) Dinoflagellate cyst species distribution in ODP Hole 112-687B. https://doi.org/10.1594/PANGAEA.753566
  7. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 5) Quality control of palynoclasts, palynomorphs and microplankton abundances in ODPHole 112-686B. https://doi.org/10.1594/PANGAEA.753560
  8. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 1) Lithologic unit and age estimation of ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753556
  9. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 4) Palynoclasts, palynomorphs and microplankton log ratios of ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753559
  10. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 2) Abundances of palynoclasts, palynomorphs and microplankton in ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753557
  11. Powell, AJ; Dodge, JD; Lewis, J (1990): (Table 3) Relative abundances of palynoclasts, palynomorphs and microplankton in ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753558