Late Pleistocene paleoproductivity patterns during the last climatic cycle in the Guyana Basin as revealed by calcareous nannoplankton

Variations in the assemblage and abundance of coccoliths reveal changes in oceanic and atmospheric dy- namics in the Guyana Basin over the last climatic cycle, mainly linked to latitudinal variations in the ITCZ (Intertrop- ical Convergence Zone). Records of the N ratio (a palaeo- productivity index of coccolithophores) allowed us to mon- itor nutri-thermocline fluctuations. Nannofossil accumula- tion rates (NAR) vary closely with the N ratio, indicating a strong correlation between these two palaeoproductivity proxies. Decreases in the N ratio and NAR values sug- gest lower palaeoproductivity during glacial substages, in- dicating a deep nutri-thermocline (deep stratification of the mixed layer) as a consequence of the piling up of warm water dragged by the NEC. This setting was favoured by the south- ern shift of the ITCZ and Trade winds which blew perpendic- ular to the Guyana coast. By contrast, increases in the N ra- tio and NAR values revealed higher palaeoproductivity dur- ing interglacial substages, suggesting a shoaling of the nutri- thermocline. This scenario is favoured by a northward dis- placement of the ITCZ with the southeast Trade winds blow- ing alongshore. Additionally, palaeoproductivity changes during substages of Marine Isotope Stage (MIS) 6-5 are of much higher amplitude than those recorded in substages of MIS 4-2 and the early Holocene. Similarities between the palaeoproductivity and the 65 N summer insolation records, suggest a link between the depth of nutri-thermocline, the lat- itudinal migration of the ITCZ and ice-sheet changes in the Northern Hemisphere.

• Publication year

  2008

• Venue

  Eearth

• Publication date

  2008-03-17

• Fields of study

  Geology, Environmental Science

• Identifiers
  DOI 10.5194/EE-4-1-2009
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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