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Zegarra, Monica; Helenes, Javier (2011): Miocene through Pleistocene dinoflagellates from ODP Site 170-1039 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.811399, Supplement to: Zegarra, M; Helenes, J (2011): Changes in Miocene through Pleistocene dinoflagellates from the Eastern Equatorial Pacific (ODP Site 1039), in relation to primary productivity. Marine Micropaleontology, 81(3-4), 107-121, https://doi.org/10.1016/j.marmicro.2011.09.005

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Abstract:
Palynological data from offshore Costa Rica, allow us to investigate the relationship between dinoflagellate cyst assemblages and changes in regional oceanic primary productivity. From Miocene to Pleistocene, productivity at ODP Site 1039 was influenced by tectonic drift, as Site 1039 approached the continent, from the Equator to its current position at ~10°N. In addition, dinoflagellate abundance is modulated by regional productivity events, which modified primary productivity, as also indicated by available data on calcareous nannofossils, diatoms, TOC, and CaCO3 content.
Five palynomorph intervals are defined. The early-late Miocene one, dominated by Batiacasphaera, represents relatively stable, productive oceanic conditions before the closure of the Indonesian and Panama Seaways. The late Miocene decrease in palynomorph recovery is related to the Carbonate Crash Event. The high abundance and diversity of the assemblages at the end of the late Miocene to early Pliocene indicate increased productivity related to the Global Biogenic Bloom, and a change in dominance from Batiacasphaera to Impagidinium to Nematosphaeropsis. The low abundance of the late Pliocene interval is related to El Niño-like conditions, and there is another change related to the disappearance of Batiacasphaera and dominance of Impagidinium, Nematosphaeropsis, and Operculodinium. The abundant Pleistocene assemblages represent increased marine productivity, and a high influx of continental palynomorphs and bissacate pollen, associated with the proximity of the Costa Rica Dome. Pleistocene dinoflagellates are characterized by Spiniferites and Selenopemphix, together with rare Impagidinium and Nematosphaeropsis.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 9.639846 * Median Longitude: -86.200034 * South-bound Latitude: 9.639700 * West-bound Longitude: -86.200100 * North-bound Latitude: 9.640000 * East-bound Longitude: -86.200000
Date/Time Start: 1996-11-01T00:00:00 * Date/Time End: 1996-11-20T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Zegarra, M; Helenes, J (2011): (Table 3) Absolute concentrations and raw counts of seven genera of dinoflagellate in ODP Site 170-1039. https://doi.org/10.1594/PANGAEA.811369
  2. Zegarra, M; Helenes, J (2011): (Appendix B) Dinoflagellate cysts in ODP Site 170-1039 sediments. https://doi.org/10.1594/PANGAEA.811398
  3. Zegarra, M; Helenes, J (2011): (Table 1) Estimated paleoposition, distance in kilometers of displacement by tectonic drift, and paleobathymetry of ODP Site 170-1039. https://doi.org/10.1594/PANGAEA.811364
  4. Zegarra, M; Helenes, J (2011): (Table 2) Palynological group observed in ODP Site 170-1039 samples. https://doi.org/10.1594/PANGAEA.811365