Renaudie, Johan; Danelian, Taniel; Saint Martin, Simona; Le Callonnec, Laurence; Tribovillard, Nicolas (2010): Siliceous phytoplankton in middle Eocene sediments of ODP Hole 207-1260A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.777772, Supplement to: Renaudie, J et al. (2010): Siliceous phytoplankton response to a Middle Eocene warming event recorded in the tropical Atlantic (Demerara Rise, ODP Site 1260A). Palaeogeography, Palaeoclimatology, Palaeoecology, 286(3-4), 121-134, https://doi.org/10.1016/j.palaeo.2009.12.004
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Abstract:
The Middle Eocene diatom and silicoflagellate record of ODP Site 1260A (Demerara Rise) is studied quantitatively in order to throw light on the changes that siliceous phytoplankton communities experienced during a Middle Eocene warming event that occurred between 44.0 and 42.0 Ma. Both Pianka's overlap index, calculated per couple of successive samples, and cluster analysis, point to a number of significant turnover events highlighted by changes in the structure of floristic communities. The pre-warming flora, dominated by cosmopolitan species of the diatom genus Triceratium, is replaced during the warming interval by a new and more diverse assemblage, dominated by Paralia sulcata (an indicator of high productivity) and two endemic tropical species of the genus Hemiaulus. The critical warming interval is characterized by a steady increase in biogenic silica and a comparable increase in excess Ba, both reflecting an increase in productivity. In general, it appears that high productivity not only increased the flux of biogenic silica, but also sustained a higher diversity in the siliceous phytoplankton communities. The microflora preserved above the critical interval is once again of low diversity and dominated by various species of the diatom genus Hemiaulus. All assemblages in the studied material are characterized by the total absence of continental and benthic diatoms and the relative abundance of neritic forms, suggesting a transitional depositional environment between the neritic and the oceanic realms.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 9.265800 * Longitude: -54.543880
Date/Time Start: 2003-02-07T04:30:00 * Date/Time End: 2003-02-09T07:35:00
Event(s):
207-1260A * Latitude: 9.265800 * Longitude: -54.543880 * Date/Time Start: 2003-02-07T04:30:00 * Date/Time End: 2003-02-09T07:35:00 * Elevation: -2548.8 m * Penetration: 491.9 m * Recovery: 391.6 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 54 cores; 491.9 m cored; 0 m drilled; 79.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets
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Datasets listed in this publication series
- Renaudie, J; Danelian, T; Saint Martin, S et al. (2010): (Appendix A2) CaCO3 content and carbon isotope values of ODP Hole 207-1260A. https://doi.org/10.1594/PANGAEA.777764
- Renaudie, J; Danelian, T; Saint Martin, S et al. (2010): (Table 1) Diatom and silicoflagellate relative abundance in ODP Hole 207-1260A. https://doi.org/10.1594/PANGAEA.777771
- Renaudie, J; Danelian, T; Saint Martin, S et al. (2010): (Appendix A4) Diatom species richness, and occurrence of diatoms and silicoflagellates in ODP Hole 207-1260A. https://doi.org/10.1594/PANGAEA.777768
- Renaudie, J; Danelian, T; Saint Martin, S et al. (2010): (Appendix A3) Geochemistry of ODP Hole 207-1260A. https://doi.org/10.1594/PANGAEA.777765