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Major shifts in calcareous phytoplankton assemblages through the Eocene-Oligocene transition of Tanzania and their implications for low-latitude primary production

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Title: Major shifts in calcareous phytoplankton assemblages through the Eocene-Oligocene transition of Tanzania and their implications for low-latitude primary production
Author: Jones, Tom Dunkley; Bown, Paul R.; Pearson, Paul N.; Wade, Bridget S.; Coxall, Helen K.; Lear, Caroline H.
Abstract: A high-resolution record of exceptionally well preserved calcareous nannofossil assemblages from Tanzania is marked by two key transitions closely related to the climatic events of the Eocene-Oligocene transition (EOT). The first transition, at 34.0 Ma, precedes the first positive shift in d18O and coincides with a distinct interval of very low nannofossil abundance and a cooling in sea surface temperatures (SST). The second, at 33.63 Ma, is immediately above the Eocene-Oligocene boundary (EOB) and is associated with a significant drop in nannofossil diversity. Both transitions involve significant reductions in the abundance of holococcoliths and other oligotrophic taxa. These changes in calcareous phytoplankton assemblages indicate (1) a widespread and significant perturbation to the low-latitude surface ocean closely tied to the EOB, (2) a potential role for reduced carbonate primary production at the onset of global cooling, and (3) a significant increase in nutrient availability in the low-latitude surface ocean through the EOT.
Description: Copyright 2008 by the American Geophysical Union. 0883-8305/08/2008PA001640
Publisher: American Geophysical Union
Department: Geology and Geophysics
URI: http://dx.doi.org/10.1029/2008PA001640
Date: 2008-10

Citation

Dunkley Jones, T., P. R. Bown, P. N. Pearson, B. S. Wade, H. K. Coxall, and C. H. Lear (2008), Major shifts in calcareous phytoplankton assemblages through the Eocene-Oligocene transition of Tanzania and their implications for low-latitude primary production, Paleoceanography, 23, PA4204, doi:10.1029/2008PA001640.

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