Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 ...

• Main Authors: Diester-Haass, Lieselotte, Zahn, Rainer
• Format: Dataset
• Language: English
• Published: PANGAEA 1996
• Subjects: DEPTH, sediment/rock; Foraminifera, benthic; Foraminifera, benthic, flux; Accumulation rate, mass; Paleoproductivity as carbon; Composite Core; Counting >150 µm fraction; Calculated; Calculated Herguera and Berger, 1991; Leg113; Joides Resolution; Ocean Drilling Program ODP; Southern Ocean; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.712516; https://doi.pangaea.de/10.1594/PANGAEA.712516

High-resolution records of carbon and oxygen isotopes and benthic foraminiferal accumulation rates for the Eocene-Oligocene section at Ocean Drilling Program Site 689 (Maud Rise, Weddell Sea; paleodepth about 1500 m) were used to infer variations in paleoproductivity in relation to changes in climate and ventilation of the deeper-water column. The benthic foraminiferal abundance and isotope records show short-term fluctuations at periodicities of 100 and 400 ka, implying orbitally driven climatic variations. Both records suggest that intermediate-depth water chemistry and primary productivity changed in response to climate. During the Eocene, productivity increased during cold periods and during cold-to-warm transitions, possibly as a result of increased upwelling of nutrient-rich waters. In the Oligocene, in contrast, productivity maxima occurred during intervals of low delta18O values (presumably warmer periods), when a proto–polar front moved to the south of the location of Site 689. This profound ... : Supplement to: Diester-Haass, Lieselotte; Zahn, Rainer (1996): Eocene-Oligocene transition in the Southern Ocean: History of water mass circulation and biological productivity. Geology, 24(2), 163-166 ...