PRODUCTIVITY AND PALEOCEANOGRAPHIC IMPLICATIONS ON THE TORE SEAMOUNT (IBERIAN MARGIN) DURING THE LAST 225 KYR - FORAMINIFERAL EVIDENCE

Foraminifera counts and climatic assemblages from the Tore Seamount ar e used to approach the glacial and interglacial changes in temperature and productivity on the Iberian Margin over the last 225 kyr. Chronos tratigraphy is based on Globigerinoides ruber and Globigerina bulloide s oxygen isotopes and supported by foraminifera and carbonate stadial fluctuations. Foraminifera indicate cooling from late interglacial sta ge 5 to the beginning of Termination I(TI). Neogloboquadrina pachyderm a-s reflects cold conditions during glacial stages 4-2. In contrast, g lacial stage 6 is dominated by warmer N. pachyderma-d and dutertrei an d a restricted arctic assemblage. Past sea surface temperatures confir m the general cooling, reaching 4.3 degrees C (SIMMAX.28) during stage 2. Multiple productivity proxies such as organic carbon, productivity -related foraminifera, and delta(13)C constrain the changes observed. A productivity increase occurs after interglacial stage 5, enhanced fr om late glacial stage 3 to TI. Present-day satellite-detected phytopla nkton plumes off Portugal would have accounted in the past glacial sta ges for the general productivity increase over the Tore. On top of thi s, welldefined peaks of organic carbon and productivity-related forami nifera correspond with Heinrich events 1-4.