dc.creator | Jones, Tom Dunkley | |
dc.creator | Bown, Paul R. | |
dc.creator | Pearson, Paul N. | |
dc.creator | Wade, Bridget S. | |
dc.creator | Coxall, Helen K. | |
dc.creator | Lear, Caroline H. | |
dc.date.accessioned | 2011-01-20T02:23:03Z | |
dc.date.available | 2011-01-20T02:23:03Z | |
dc.date.issued | 2008-10 | |
dc.identifier.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. | en |
dc.identifier.uri | http://dx.doi.org/10.1029/2008PA001640 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/93228 | |
dc.description | Copyright 2008 by the American Geophysical Union.
0883-8305/08/2008PA001640 | en |
dc.description.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. | en |
dc.language.iso | en | |
dc.publisher | American Geophysical Union | |
dc.title | Major shifts in calcareous phytoplankton assemblages through the Eocene-Oligocene transition of Tanzania and their implications for low-latitude primary production | en |
dc.type | Article | en |
local.department | Geology and Geophysics | en |